CN113292816B - Cross-linked polyetherimide/polyetheretherketone blending material as well as preparation method and application thereof - Google Patents

Abstract

The invention provides a cross-linked polyetherimide/polyetheretherketone blend material and its preparation method and application. The blend material contains a polyetherimide polymer and a polyether ether ketone polymer. The glass transition temperature of the cross-linked polyetherimide/polyether ether ketone blend material of the present invention is higher than that of the polyether ether ketone polymer matrix by more than 20°C, and the maximum tensile modulus can reach about 108MPa , At the same time, its crystallinity remains above 28%. Experiments have proved that the cross-linked polyetherimide/polyether ether ketone blend material of the present invention has both high glass transition temperature and high mechanical properties, and is a promising material in aerospace, military and national defense. , New energy and other fields have been applied in new materials.

Description

A kind of cross-linked polyetherimide/polyether ether ketone blend material and its preparation method and application

technical field

The invention belongs to the technical field of special engineering plastic materials, and in particular relates to a cross-linked polyetherimide/polyether ether ketone polymer blend material and its preparation method and application.

Background technique

Since the 20th century, influenced by the arms race, aerospace technology has developed rapidly, resulting in a sharp increase in the demand for heat-resistant, light-weight, and high-strength materials. Countries around the world have invested a lot of energy in developing new materials with excellent performance. Special engineering plastics are the third generation of plastics developed after the first generation of general-purpose plastics and the second generation of engineering plastics. Phenylsulfide (PPS), polysulfone (PSU), polyethersulfone (PES), polyetheretherketone (PEEK). Special engineering plastics have added value such as light specific gravity and high specific strength, and can be made into coatings, fibers, films and structural materials according to needs, so they are widely used in aerospace, electronic devices, lightweight and new energy vehicles, oil and gas development, High-tech fields such as bio-bone materials, bio-dental materials, and hemodialysis have broad application markets. However, with the development of science and technology, there are still some deficiencies in the existing special engineering plastics. The main reason is that they have higher requirements on their temperature resistance, and they need to maintain stable performance at higher temperatures.

Among them, polyetheretherketone (PEEK) refers to a fully aromatic polymer containing only benzene rings, carbonyl groups and ether bonds in the repeating units of the molecular chain. It is a semi-crystalline polymer with a common crystallinity of 20% to 30%, a glass transition temperature Tg of about 143°C, and a melting point Tm as high as 343°C. It has excellent processing performance and can be used for extrusion molding and injection molding. It is one of the plastic varieties with the best comprehensive performance and the best heat resistance grade among special engineering plastics at present. However, its relatively low Tg limits its further development, and cannot meet the temperature resistance requirements of today's special engineering plastics.

Polyetherimide (PEI) refers to a class of aromatic polymers containing imide rings in the main chain. It is the most abundant and diverse form of special engineering plastics. It has excellent thermal stability and mechanical properties, and is also resistant to temperature and radiation. It is a special engineering plastic with excellent performance. However, its solvent resistance and hydrolysis resistance are poor, its viscosity in the molten state is high, and its processability is poor, which all bring some limitations to the application of polyetherimide.

Contents of the invention

In order to solve the problems of existing special engineering plastics, especially PEEK, due to its low Tg, unstable performance at working temperatures above 125°C, the present invention provides a cross-linked polyetherimide/polyester An ether ether ketone blend material and its preparation method and application. The blend material has the advantages of high temperature resistance, high mechanical properties and the like.

The technical solution adopted by the present invention to solve the problems of the technologies described above is as follows:

The invention provides a cross-linked polyetherimide/polyether ether ketone blend material. The preparation raw materials of the blend material contain polyetherimide polymer and polyether ether ketone polymer.

According to an embodiment of the present invention, the mass percent content of the cross-linked polyetherimide polymer in the blended material is 5-30%, preferably 10-20%, such as 10%, 12% %, 15%, 17%, 20%.

According to an embodiment of the present invention, the mass percentage of the polyetheretherketone polymer in the blended material is 70-95%, preferably 80-90%, for example 80%, 83%, 85% , 88%, 90%.

According to an embodiment of the present invention, the glass transition temperature Tg of the blend material is at least 20°C higher than the Tg temperature of the polyetheretherketone polymer; for example, the glass transition temperature Tg of the blend material is 160-175 °C, preferably 160 to 167.7 °C.

According to an embodiment of the present invention, the maximum tensile modulus of the blended material is 80-110 MPa, for example, 90-106 MPa.

According to an embodiment of the present invention, the crystallinity of the blended material is above 28%, such as 28.5-32%.

According to an embodiment of the present invention, the blended material has a morphology substantially as shown in any one of (2)-(5) in FIG. 3 .

According to an embodiment of the present invention, the cross-linked polyetherimide polymer and the polyetheretherketone polymer in the blended material are completely soluble in each other without phase separation.

According to an embodiment of the present invention, the polyetherimide polymer is terminated with activated functional groups. The capping in the present invention means that at least one end of the polyetherimide polymer is capped by an activated functional group; preferably, both ends of the polyetherimide polymer are capped by an activated functional group.

Preferably, the activated functional group is phenynyl.

According to an embodiment of the present invention, the activated functional group comes from a capping agent, and the capping agent is preferably 4-phenylethynylphthalic anhydride (PEPA).

According to an embodiment of the present invention, the polyetherimide polymer is prepared by capping with the capping agent.

According to an exemplary embodiment of the present invention, the polyetherimide polymer is composed of 4,4'-diaminodiphenyl ether (ODA), bisphenol A diether dianhydride (BPADA) and the end-capping agent Response gets.

According to an embodiment of the present invention, the molar ratio of 4,4'-diaminodiphenyl ether (ODA), bisphenol A diether dianhydride (BPADA) and the above-mentioned end-capping agent is (1.0～1.3):1:( 0～0.6); preferably, (1.1～1.2):1:(0.2～0.4), preferably 1.1:1:0.2 or 1.2:1:0.4.

According to an embodiment of the present invention, the cross-linked polyetherimide is obtained by cross-linking activated functional groups of polyetherimide polymers.

According to an exemplary solution of the present invention, the cross-linked polyetherimide/polyetheretherketone blend material can be 10wt% (10mol% ODA-PEI)/PEEK, 20wt% (10mol% ODA-PEI)/ Any of PEEK, 10wt% (20mol% ODA-PEI)/PEEK or 20wt% (20mol% ODA-PEI)/PEEK.

The present invention also provides a preparation method for the above-mentioned cross-linked polyetherimide/polyether ether ketone blend material, the preparation method includes the following steps: combining the polyetherimide polymer and the polyether ether ketone Blending and melt extruding to obtain the cross-linked polyetherimide/polyether ether ketone blend material.

Preferably, the polyetherimide polymer, polyetheretherketone and cross-linked polyetherimide all have the above-mentioned definitions.

According to an embodiment of the present invention, the preparation method comprises the following steps:

(1) reacting 4,4'-diaminodiphenyl ether (ODA), bisphenol A diether dianhydride (BPADA) and the above-mentioned end-capping agent to prepare a polyetherimide polymer;

(2) Prepare or prepare polyetheretherketone as the matrix of the blended material;

(3) blending the polyetherimide polymer prepared in step (1) with the polyether ether ketone described in step (2), and melt extruding to prepare the cross-linked polyetherimide/polyetherimide/ Polyether ether ketone blend material.

According to an embodiment of the present invention, the mass ratio of the polyetherimide polymer and polyether ether ketone when blended is (1-2):(9-8), preferably 2:8. In the present invention, the polyetheretherketone used for preparing the blend material is not specifically limited, and may be purchased from the market or prepared by methods known in the art.

According to the embodiment of the present invention, the blending method can be carried out using a blending method known in the art, preferably mechanical blending. Preferably, the blending time is high-speed stirring for 30s.

According to an embodiment of the present invention, before the blending, drying the blended material under vacuum conditions may also be included. The present invention does not specifically limit the drying conditions, and common drying methods in the field can be used, such as treating at 90° C. for 12 hours under vacuum conditions.

According to an embodiment of the present invention, in the step (1), the ratio of 4,4'-diaminodiphenyl ether (ODA), bisphenol A diether dianhydride (BPADA) and the end-capping agent has Proportions as above.

Preferably, the capping agent is selected as described above.

According to an embodiment of the present invention, the reaction in step (1) occurs in the presence of a solvent. Preferably, the solvent is N,N-dimethylacetamide (DMAc).

According to an embodiment of the present invention, the reaction in step (1) includes a copolymerization reaction, a capping reaction and a ring buckling reaction.

According to an embodiment of the present invention, the ring closure reaction is carried out in the presence of triethylamine and acetic anhydride.

Preferably, the molar ratio of triethylamine to 4,4'-diaminodiphenyl ether (ODA) is (1.5-5):1, preferably 3:1; preferably, the molar ratio of triethylamine to acetic anhydride is (0.5-1.5):1, preferably 1:1.

According to an embodiment of the present invention, the polyetherimide polymer is terminated with activated functional groups. Preferably, the activated functional groups and capping have the meanings as indicated above.

According to an exemplary embodiment of the present invention, the preparation method of the polyetherimide polymer described in step (1) specifically includes the following steps: dissolving ODA and BPADA in a solvent according to the above ratio and polymerizing; adding PEPA according to the above ratio, and performing End-capping reaction; adding triethylamine and acetic anhydride according to the above ratio to carry out ring closure reaction to obtain the polyetherimide polymer.

According to an embodiment of the present invention, the reaction in step (1) is carried out at normal temperature, preferably at 10-40°C, more preferably at 20-30°C.

According to an embodiment of the present invention, the polymerization is carried out in an inert environment, illustratively, the inert environment is provided by a nitrogen atmosphere;

For example, the polymerization time is 8-14 hours, preferably 12 hours;

For example, the capping time is 4 to 8 hours, preferably 6 hours;

According to an embodiment of the present invention, the time for the buckle reaction is 2 to 6 hours, preferably 3 hours.

According to an embodiment of the present invention, the preparation method described in step (1) further includes discharging after the buckle reaction is completed. For example, the discharging is carried out in ethanol.

The present invention also provides the application of the above-mentioned cross-linked polyetherimide/polyetheretherketone blend material in the fields of aerospace, military defense or new energy.

Beneficial effects of the present invention:

The present invention utilizes the characteristics of PEEK and PEI as fully compatible polymers, and through polymer blending, combines the performances of the two together simply and effectively to complement each other's advantages, and finally obtains a comprehensive performance that is more in line with the application New blend materials required.

Specifically, the present invention uses polyetherimide (PEI) that has good thermal and mechanical properties and contains activated functional groups (such as phenynyl-terminated), and uses this polyetherimide (PEI) as the polyether ether ketone The modified material is blended to prepare a cross-linked polyetherimide/polyether ether ketone blend material with good heat resistance, flexibility and high mechanical properties. The prepared cross-linked polyetherimide/polyether ether ketone blend material has a higher glass transition temperature, a wider temperature application range, and a significantly improved tensile modulus, thereby obtaining a more excellent mechanical properties. performance. The glass transition temperature of the cross-linked polyetherimide/polyether ether ketone blend material of the present invention is higher than that of the polyetheretherketone polymer matrix by more than 20°C, and due to the addition of polyetherimide A small amount will not significantly affect the crystallization behavior of polyether ether ketone. By adjusting the composition and content of the cross-linked polyetherimide, the maximum tensile modulus of the blended material can reach about 108 MPa, and at the same time, its crystallinity remains above 28%. Experiments have proved that the cross-linked polyetherimide/polyether ether ketone blend material of the present invention has both high glass transition temperature and high mechanical properties, and is a promising material in aerospace, military and national defense. , New energy and other fields have been applied in new materials.

Compared with developing a new type of polymer, the research cycle of the polymer blend material of the present invention is shorter, the research cost is lower, and the products are more diverse. At the same time, the present invention introduces a crosslinking group (such as an activated functional group terminated by a phenynyl group), so that a more obvious effect can be achieved when less PEI is incorporated, and the performance of the material is improved while ensuring the performance of the material. Stability, and to a certain extent, reduce the cost, which is conducive to the industrialization of materials.

Description of drawings

Figure 1 is a schematic diagram of the preparation of samples in Preparation Examples 1 and 2.

Fig. 2 is the infrared spectrogram of the samples of Preparation Examples 1-2, Examples 1-4 and Comparative Example 1.

Fig. 3 is the scanning electron microscope picture of the samples of Examples 1-4 and Comparative Example 1.

Fig. 4 is the DSC curve of the samples of Examples 1-4 and Comparative Example 1.

Fig. 5 is the tensile stress-strain curve of the samples of Examples 1-4 and Comparative Example 1.

detailed description

The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

Unless otherwise stated, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

Preparation Example 1

Preparation of Polyetherimide Polymers Containing 10 Mole % Phenynyl Terminations:

In the reaction container, add raw material 4.4051g (0.022mol) ODA, 10.4097g (0.02mol) BPADA, wherein the molar ratio of the two is 1.1:1, then add 100mL DMAc solvent to the container, under nitrogen atmosphere, room temperature 20 Stir at ~30°C for 12h; then add 0.9930g (0.004mol) of PEPA and 10mL of DMAc, and stir at room temperature for 6h; then add 9.17mL (0.066mol) of triethylamine, then add 6.24mL (0.066mol) of acetic anhydride, and stir at room temperature React for 3 hours, precipitate in ethanol at room temperature, filter to obtain a filter cake, boil and reflux with ethanol for 6 times, filter out and dry in a vacuum oven at 90°C for 12 hours; obtain a polyether containing 10% phenynyl-terminated Imide polymer, named 10% ODA-PEI.

Figure 1 is a schematic diagram of the preparation of polyetherimide (ODA-PEI).

Preparation example 2

Preparation of Polyetherimide Polymers Containing 20 Mole % Phenynyl Terminations:

Other steps are the same as Preparation Example 1, the difference is only in:

The molar ratio of the raw materials ODA, BPADA and PEPA is 1.2:1:0.4.

A polyetherimide polymer containing 20% phenynyl end caps was prepared and named 20% ODA-PEI.

Example 1

(1) Purchase polyether ether ketone (manufacturer: Changchun Jida Special Plastic Engineering Research Co., Ltd.; model: the melt index is 46g/10min), and use it as a polymer matrix;

(2) Preparation of cross-linked polyetherimide/polyether ether ketone polymer blend material:

Take the 10% ODA-PEI prepared in Preparation Example 1 and polyether ether ketone at a mass ratio of 1:9, mechanically blend and stir at high speed for 30 seconds, and then melt and extrude at 380°C to prepare a cross-linked polyetherimide /polyether ether ketone blend material, the content of 10% ODA-PEI in the blend material is 10 wt%, and the blend material is named as 10 wt% (10% ODA-PEI)/PEEK.

Example 2

The other steps are the same as in Example 1, except that the mass ratio of 10% ODA-PEI to polyether ether ketone is 2:8.

In the prepared cross-linked polyetherimide/polyether ether ketone blend material, the content of 10% ODA-PEI is 20wt%, and the blend material is named 20wt% (10% ODA-PEI)/PEEK .

Example 3

Other steps are with embodiment 1, and difference is only in:

The mass ratio of 20% ODA-PEI prepared in Preparation Example 2, 20% ODA-PEI and polyether ether ketone was 1:9.

In the prepared cross-linked polyetherimide/polyetheretherketone blend material, the content of 20% ODA-PEI is 10 wt%, and the blend material is named 10 wt% (20% ODA-PEI)/PEEK.

Example 4

Other steps are the same as embodiment 3, the difference is only in:

The mass ratio of 20% ODA-PEI to polyether ether ketone is 2:8.

A cross-linked polyetherimide/polyether ether ketone polymer blend material was prepared, in which the content of 20% ODA-PEI was 20 wt%, and named as 20 wt% (20% ODA-PEI)/PEEK.

Comparative example 1

Take polyether ether ketone (manufacturer: Changchun Jida Special Plastic Engineering Research Co., Ltd.; model: melt index: 46 g/10 min) as comparative example 1.

test case

Get the 10% ODA-PEI and 20% ODA-PEI that above-mentioned preparation example 1～2 makes respectively, the 10wt% (10%ODA-PEI)/PEEK that embodiment 1～4 makes, 20wt% (10%ODA-PEI) PEI)/PEEK, 10wt% (20%ODA-PEI)/PEEK, 20wt% (20%ODA-PEI)/PEEK and the PEEK of comparative example 1, as samples, tested and obtained the following test results:

Fig. 2 is the infrared spectrogram of the samples of Preparation Examples 1-2, Examples 1-4 and Comparative Example 1, which proves that the products are successfully prepared. The model of the test instrument is Nicoct Impact 410 Fourier Transform Infrared Spectrometer. The specific test method is: i. For the film sample, directly use air as a reference, and measure its infrared transmission curve in the range of 400-4000 cm ^-1 at room temperature. ii. For the powder sample, first dry it thoroughly in a vacuum oven, then use potassium bromide as a reference, and use the tablet method to measure its infrared transmission curve in the range of 400-4000cm ^-1 at room temperature. Among them, 1776cm ^-1 and 1720cm ^-1 are the symmetric stretching vibration and asymmetric stretching vibration absorption peaks of carbonyl in polyimide respectively, and 1375cm ^-1 is the stretching vibration absorption peak of imide bond, proving that polyimide The ether imide was successfully introduced into the composite; in the IR spectra of 10% ODA@PEI and 20% ODA@PEI, the absorption vibration peak of the alkyne group was at 2210 cm ^-1 , but there was no This absorption peak proves that the alkynyl group has been cross-linked completely during the processing of the composite material.

Fig. 3 is the scanning electron microscope picture of the samples of Examples 1-4 and Comparative Example 1. The test instrument model is FEI Nova nano450 field emission scanning electron microscope. The specific sample preparation method is as follows: first quench the extruded and granulated sample in liquid nitrogen, stick it on the sample stage with conductive adhesive, and test it under vacuum condition after spraying gold. Among them, (1) represents PEEK; (2) represents 10wt% (10% ODA-PEI)/PEEK; (3) represents 20wt% (10% ODA-PEI)/PEEK; (4) represents 10wt% (20% ODA -PEI)/PEEK; (5) represents 20 wt% (20% ODA-PEI)/PEEK. It can be seen that: the blend does not undergo phase separation, and PEEK and PEI are completely compatible with each other.

Fig. 4 is the DSC curve of the samples of Examples 1-4 and Comparative Example 1, and the test instrument model is TA Q2000 differential scanning calorimetry analyzer. The specific test method is as follows: first fully dry the sample, weigh 6-7 mg of the sample in a Mettler crucible for sample preparation, use the empty crucible as a reference, conduct the test in a nitrogen environment (nitrogen flow rate is 50mL/min), and heat up The rate is 20°C/min, the temperature range is 30-400°C, and the DSC curve is obtained. From the test results in Figure 4, it can be seen that Tg (PEEK) is 144.99°C, Tg (10wt% (10% ODA-PEI)/PEEK) is 160.71°C, and Tg (20wt% (10% ODA-PEI)/PEEK) is 161.62 °C, Tg (10wt% (20% ODA-PEI)/PEEK) was 162.15°C, and Tg (20wt% (20% ODA-PEI)/PEEK) was 167.71°C. It shows that the glass transition temperature Tg of the blended material is significantly higher than that of PEEK, and with the adjustment of the amount of polyetherimide, the glass transition temperature Tg of the blended material can be adjusted.

Fig. 5 is the tensile stress-strain curve of the samples of Examples 1-4 and Comparative Example 1, and the test instrument model is AG-I20KN universal testing machine. The specific test method is: the sample is made into a film by hot pressing, and then cut into a stretched sample with a length of 4cm and a width of 0.5cm, and the tensile properties are measured at room temperature, with a stretching speed of 5mm/min until the sample is broken. . It can be seen from Figure 5 that with the increase of the ODA excess ratio and the increase of the PEI content, the mechanical strength of the blend increases, and the elongation at break decreases, that is, the rigidity of the material increases and the toughness decreases. The adjustment of the amount of imine can adjust the mechanical properties of the blended material.

The performance of table 1. embodiment 1～4 and comparative example 1 sample

sample Glass transition temperature/℃ Crystallinity/% Maximum tensile stress/MPa Comparative example 1 144.99 30.55 80.5 Example 1 160.71 29.79 84.8 Example 2 161.62 27.79 90.7 Example 3 162.15 30.05 99.3 Example 4 167.71 28.72 105.4

The present invention synthesizes and adopts polyetherimide (PEI) with good thermal and mechanical properties and containing activated functional groups (such as phenynyl-terminated) as a blended modified material of polyether ether ketone, and prepares a polyether ether ketone with good resistance Cross-linked polyetherimide/polyether ether ketone polymer blend material with thermal, flexible and high mechanical properties. It can be seen from Table 1 that the prepared cross-linked polyetherimide/polyether ether ketone polymer blend material has a higher glass transition temperature and a wider temperature application range, and its tensile modulus is also It has been significantly improved, so as to obtain more excellent mechanical properties.

The glass transition temperature of the cross-linked polyetherimide/polyether ether ketone polymer blend material of the present invention is higher than that of the polyether ether ketone polymer matrix by more than 20°C. It can be seen from the DSC curve that Since the amount of polyetherimide added is small, it does not significantly affect the crystallization behavior of polyether ether ketone. By adjusting the composition and content of cross-linked polyetherimide, the maximum tensile modulus of the prepared cross-linked polyetherimide/polyether ether ketone polymer blend can reach about 108 MPa, and at the same time, its The crystallinity still remains above 28%. Experiments have proved that the cross-linked polyetherimide/polyetheretherketone polymer blend material of the present invention has both high glass transition temperature and high mechanical properties, and is a promising material in aerospace, aerospace, New materials used in military defense, new energy and other fields.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-mentioned embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. A cross-linked polyetherimide/polyether ether ketone blend material is characterized in that, the preparation raw material of described blend material contains polyetherimide polymer and polyether ether ketone polymer; The activated functional groups of the etherimide polymer are cross-linked with each other to obtain a cross-linked polyetherimide, and the polyetherimide polymer is terminated by an activated functional group, and the activated functional group is a phenylynyl group; The mass percentage of the cross-linked polyetherimide polymer in the blended material is 5-30%; The mass percent content of the polyetheretherketone polymer in the blended material is 70-95%. 2. The blend material according to claim 1, wherein the glass transition temperature Tg of the blend material is at least 20°C higher than the Tg of the polyetheretherketone polymer; And/or, the maximum tensile modulus of the blended material is 80~110MPa; And/or, the crystallinity of the blended material is above 28%. 3. The blend material according to claim 1, characterized in that, the crystallinity of the blend material is 28.5-32%. 4. The blend material according to claim 1, characterized in that, the activated functional group comes from an end-capping agent. 5. The blend material according to claim 4, characterized in that, the end-capping agent is 4-phenylethynyl phthalic anhydride; The polyetherimide polymer is prepared by capping with the capping agent. 6. The blend material according to claim 5, characterized in that, the polyetherimide polymer consists of 4,4'-diaminodiphenyl ether, bisphenol A type diether dianhydride and the encapsulated terminal agent reaction to obtain; The molar ratio of 4,4'-diaminodiphenyl ether, bisphenol A diether dianhydride and the end-capping agent is (1.1~1.2):1:(0.2~0.4). 7. The preparation method of the cross-linked polyetherimide/polyether ether ketone blend material described in any one of claims 1-6, it is characterized in that, the preparation method comprises the steps as follows: the polyether The imide polymer and the polyetheretherketone polymer are blended and melt-extruded to obtain the cross-linked polyetherimide/polyetheretherketone blend material. 8. preparation method according to claim 7, is characterized in that, described preparation method comprises the steps as follows: (1) Reacting 4, 4'-diaminodiphenyl ether, bisphenol A diether dianhydride and an end-capping agent to prepare a polyetherimide polymer; (2) Prepare or prepare polyetheretherketone polymer as a matrix of blended materials; (3) Blending the polyetherimide polymer prepared in step (1) and the polyether ether ketone polymer described in step (2), and melt extruding to prepare the cross-linked polyetherimide Amine/polyetheretherketone blend material. 9. The preparation method according to claim 8, characterized in that, the mass ratio of the polyetherimide polymer and the polyether ether ketone polymer blending is (1 ~ 2): (9 ~ 8) ; And/or, before the blending, it also includes drying the blended material under vacuum conditions; And/or, the reaction in step (1) occurs in the presence of a solvent; the solvent is N, N-dimethylacetamide. 10. The preparation method according to claim 8, characterized in that, the reaction in step (1) includes copolymerization reaction, capping reaction and clasp reaction; The buckling reaction is carried out in the presence of triethylamine and acetic anhydride; The molar ratio of triethylamine to 4,4'-diaminodiphenyl ether is (1.5-5):1; The molar ratio of triethylamine to acetic anhydride is (0.5-1.5):1; The polyetherimide polymer is terminated with the activated functional group. 11. The preparation method according to claim 10, characterized in that the preparation method of the polyetherimide polymer in step (1) specifically comprises the following steps: mixing 4,4'-diaminodiphenyl ether, bis Phenol A type diether dianhydride is dissolved in a solvent in proportion to polymerize; 4-phenylethynyl phthalic anhydride is added in proportion to carry out end-capping reaction; then triethylamine and acetic anhydride are added to carry out buckling reaction to obtain The polyetherimide polymer. 12. The preparation method according to claim 11, characterized in that the reaction in step (1) is carried out at room temperature; And/or, the polymerization is carried out in an inert environment; And/or, the time of said polymerization is 8～14h; And/or, the capping time is 4~8h; And/or, the time of the buckle reaction is 2~6h; And/or, the preparation method described in step (1) further includes discharging after the clasp reaction is completed. 13. The application of the cross-linked polyetherimide/polyether ether ketone blend material according to any one of claims 1-6 in the fields of aerospace, military defense or new energy.

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