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Coatings
Special Issues
Organic and Polymeric Materials: Synthesis, Properties and Applications
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Organic and Polymeric Materials: Synthesis, Properties and Applications

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Functional Polymer Coatings and Films".

Deadline for manuscript submissions: 5 February 2025 | Viewed by 3775

Special Issue Editors

Dr. Yingru Li

E-Mail Website
Guest Editor
College of Intelligent Systems Science and Engineering, Hubei Minzu University, Enshi 445000, China
Interests: nanomaterials; polymeric science and engineering
Dr. Hangyu Dong

E-Mail Website
Guest Editor
College of Intelligent Systems Science and Engineering, Hubei Minzu University, Enshi 445000, China
Interests: nanostructure; metallic science and engineering; steel
Dr. Jun Zhao

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Beijing Institute of Technology, Beijing 100811, China
Interests: surface and interface science; tribology; polymeric coating; nanomaterials

Special Issue Information

Dear Colleagues,

In both industrial production and daily life, coatings play very important roles, such as the realization of anti-corrosion, enhancing and weakening heat transfer, electromagnetic protection, surface hardening and many other functions. Among them, organic materials, which are mainly represented by polymer materials, have been widely used because of their advantages such as low cost, simple construction and easy regulation of properties. It has been an important development trend of polymer organic coatings to realize the high performance and many functions of coatings, by controlling the composition of the coating, such as adding new organic additives or nanomaterials. New synthesis strategies, new chemical compounds, new nanocomposites and new coating technologies, etc., are all in great demand.

Therefore, we would like to invite you to submit your original research to this Coatings Special Issue entitled “Organic and Polymeric Materials: Synthesis, Properties and Applications”. This Special Issue includes all aspects of research related to intumescent and organic or polymeric coatings, including theoretical and application-oriented papers, experimental and numerical studies, case studies and reviews.

We encourage you to send us manuscripts containing scientific findings within the broad field of coatings.

Dr. Yingru Li
Dr. Hangyu Dong
Dr. Jun Zhao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • organic coatings
  • polymeric coatings
  • organic additives for coatings
  • new synthesis strategies for coating materials
  • polymer aging
  • nano additives
  • processing technologies
  • coating properties
  • barrier' anti-corrosion
  • shilding

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
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Further information on MDPI's Special Issue polices can be found here.

Published Papers (4 papers)

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Research

14 pages, 3514 KiB  
Article
Thymol-Loaded Polymeric Nanocapsules’ Repellent Activity on Nymphs of Rhipicephalus sanguineus Sensu Lato
by Amanda M. R. Sales, Gessyka R. S. Pereira, Lais C. N. Lima, Caio M. O. Monteiro, Breno N. Matos, Stephânia F. Taveira, Marcilio Cunha-Filho, Guilherme M. Gelfuso and Tais Gratieri
Coatings 2024, 14(10), 1295; https://doi.org/10.3390/coatings14101295 - 11 Oct 2024
Viewed by 718
Abstract
Thymol-loaded polymeric nanocapsules were developed in this study to control volatilization and drug release for repellent application on Rhipicephalus sanguineus nymphs. Policaprolactone-loaded nanocapsules were prepared and characterized by diameter, PdI, zeta potential, pH, entrapment efficiency, and thymol content. Moreover, drug release, skin permeation [...] Read more.
Thymol-loaded polymeric nanocapsules were developed in this study to control volatilization and drug release for repellent application on Rhipicephalus sanguineus nymphs. Policaprolactone-loaded nanocapsules were prepared and characterized by diameter, PdI, zeta potential, pH, entrapment efficiency, and thymol content. Moreover, drug release, skin permeation profile, and repellent activity were evaluated. Nanocapsules showed a mean diameter of 195.7 ± 0.5 nm, a PdI of 0.20 ± 0.01, a zeta potential of −20.6 ± 0.3 mV, a pH of 4.7 ± 0.1, and an entrapment efficiency and a thymol content of 80.1 ± 0.1% and 97.9 ± 0.2%, respectively. The nanosystem progressively released 68.6 ± 2.3% of the thymol over 24 h, demonstrating that it can control drug release. Thymol-loaded nanocapsules showed less epidermis penetration upon skin application than pure thymol (control). Moreover, nanocapsules showed 60–70% repellency for 2 h against Rhipicephalus sanguineus nymphs. Thus, the nanocapsules proved to be a promising alternative for use as an arthropod repellent. Full article
(This article belongs to the Special Issue Organic and Polymeric Materials: Synthesis, Properties and Applications)
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Figure 1

Figure 1
<p>NPTML stability. The samples were stored at 4 °C and 40 °C, and the parameters of (<b>A</b>) hydrodynamic diameter, (<b>B</b>) polydispersity index <span class="html-italic">(PdI)</span>, (<b>C</b>) zeta potential, (<b>D</b>) pH, (<b>E</b>) encapsulation efficiency, and (<b>F</b>) drug content were evaluated for 90 days (n = 3).</p> Full article ">Figure 2
<p>TEM images of thymol-loaded polymeric nanocapsules at different magnifications.</p> Full article ">Figure 3
<p>Thymol release profile from thymol-loaded polymeric nanocapsules (NPTMLs) compared with the free-drug formulation used as a control over 24 h (n = 5).</p> Full article ">Figure 4
<p>Thymol skin delivery from thymol-loaded polymeric nanocapsules (NPTMLs) compared with the free-drug formulation used as a control. After 2 h of skin treatment, thymol was recovered from the stratum corneum (SC), hair follicle (HF), and remaining skin (RS) (n = 5). ** <span class="html-italic">p</span> &lt; 0.01.</p> Full article ">Figure 5
<p>First derivate of the TGA analysis of thymol-loaded polymeric nanocapsules (NPTMLs), the physical mixture, thymol, HPβCD, and polycaprolactone (PCL), as supplied.</p> Full article ">Figure 6
<p>DSC analysis of thymol-loaded polymeric nanocapsules (NPTMLs), the physical mixture, thymol, HPβCD, and polycaprolactone (PCL), as supplied.</p> Full article ">
17 pages, 5303 KiB  
Article
Fluorescent Nanocomposites of Cadmium Sulfide Quantum Dots and Polymer Matrices: Synthesis, Characterization, and Sensing Application
by Paula Méndez, Karla Ramírez, Alex Lucero, Johny Rodríguez and Betty López
Coatings 2024, 14(10), 1256; https://doi.org/10.3390/coatings14101256 - 1 Oct 2024
Viewed by 1054
Abstract
Fluorescent materials for sensing have gained attention for the visual detection of different substances as metals and pesticides for environmental monitoring. This work presents fluorescent nanocomposites in solution, film, and paper obtained without capping and stabilizing agents, coming from quantum dots of cadmium [...] Read more.
Fluorescent materials for sensing have gained attention for the visual detection of different substances as metals and pesticides for environmental monitoring. This work presents fluorescent nanocomposites in solution, film, and paper obtained without capping and stabilizing agents, coming from quantum dots of cadmium sulfide (CdS QDs) and anionic–cationic polymer matrices. Fluorescent films were formed by casting and fluorescent paper by impregnation from the solutions. The optical properties of CdS QDs in solution showed absorption between 418 and 430 nm and a maximum emission at 460 nm. TEM analysis evidenced particle size between 3 and 6 nm and diffraction patterns characteristic of CdS nanocrystals. Infrared spectra evidenced changes in the wavenumber in the fluorescent films. The band gap values (2.95–2.82 eV) suggested an application for visible transmitting film. Fluorescent solutions by UV-vis and fluorescence evidenced a chemical interaction with glyphosate standard between 1 and 100 µg/mL concentrations. The analysis of red, green, and blue color codes (RGB) evidenced a color response of the fluorescent paper at 10 and 100 µg/mL, but the fluorescent films did not show change. Nanocomposites of chitosan and pectin, in solution and on paper, exhibited a behavior “turn-on” sensor, while carboxymethylcellulose had a “turn-off” sensor. This methodology presents three fluorescent materials with potential applications in visual sensing. Full article
(This article belongs to the Special Issue Organic and Polymeric Materials: Synthesis, Properties and Applications)
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Figure 1

Figure 1
<p>(<b>A</b>) UV–vis spectra of CdS QD chitosan (Ch), carboxymethylcellulose (CMC), and pectin (Pec) nanocomposite solutions. (<b>B</b>) Photographs of the fluorescent nanocomposite solutions under visible light and a UV lamp, Blank-B, F1 (Cd:S 5:2.5 mM), F2 (Cd:S 5:5 mM), and F3 (Cd:S 10:5 mM). (<b>C</b>) UV–vis spectra of CdS QD chitosan (Ch), carboxymethylcellulose (CMC), and pectin (Pec) nanocomposite solutions treated with 100 µg/mL of Gly. (<b>D</b>) Photographs of the fluorescent nanocomposite solutions treated with 100 µg/mL of Gly (F1, F2, and F3).</p> Full article ">Figure 2
<p>TEM images of (<b>A</b>) chitosan, (<b>B</b>–<b>D</b>) F1-CdS/chitosan nanocomposite, (<b>E</b>) CMC, (<b>F</b>–<b>H</b>) F1-CdS/CMC nanocomposite, (<b>I</b>) pectin, (<b>J</b>–<b>L</b>) F1-CdS/Pec nanocomposite (F1: 5 mM CdCl<sub>2</sub>·2.5H<sub>2</sub>O, 2.5 mM Na<sub>2</sub>S·XH<sub>2</sub>O and 1% (<span class="html-italic">w</span>/<span class="html-italic">v</span>) polymeric matrix). (<b>C</b>,<b>G</b>,<b>K</b>) were enlarged by 50%: (<b>D</b>) 1367 × 647 pixels, (<b>H</b>) 1449 × 649 pixels, and (<b>L</b>) 1757 × 755 pixels.</p> Full article ">Figure 3
<p>FTIR spectra of (<b>A</b>) chitosan, (<b>B</b>) CMC, (<b>C</b>) and pectin nanocomposite films, and (<b>D</b>) photographs of the films under a UV lamp. Blank (polymer), F1 (Cd:S 5:2.5 mM), F2 (Cd:S 5:5 mM), and F3 (Cd:S 10:5 mM).</p> Full article ">Figure 4
<p>UV–vis spectra of CdS QD chitosan (Ch), carboxymethylcellulose (CMC), and pectin (Pec) nanocomposite films.</p> Full article ">Figure 5
<p>Images of the paper impregnated with the fluorescent nanocomposite solutions. On the left, the photography of the paper without Gly and the paper treated with 10 and 100 µg/mL of Gly is presented. All the images were taken under a 365 nm UV lamp. On the right, RGB codes for each paper are shown. The data were analyzed with n = 2.</p> Full article ">
17 pages, 5485 KiB  
Article
Research on the Rheological Properties and Modification Mechanism of Epoxy Resin/SBS Composite-Modified Asphalt
by Jinchao Yue, Xiaofan Nie, Xiaoqian Liu, Fei Guo, Ming Lv, Guoqi Tang and Ruixia Li
Coatings 2024, 14(10), 1253; https://doi.org/10.3390/coatings14101253 - 1 Oct 2024
Viewed by 594
Abstract
Both epoxy resin (ER) and SBS are considered effective pavement materials for avoiding ruts. However, epoxy resin asphalt suffers from poor low-temperate performance and a high material cost in practical applications. Aiming to tackle these issues, a new type of composite asphalt modifier [...] Read more.
Both epoxy resin (ER) and SBS are considered effective pavement materials for avoiding ruts. However, epoxy resin asphalt suffers from poor low-temperate performance and a high material cost in practical applications. Aiming to tackle these issues, a new type of composite asphalt modifier (ER-SBS) has been fabricated by combining epoxy resin with SBS. This work prepared modified asphalt with different doping amounts using the above composite asphalt modifier (ER-SBS), intending to explore the properties of composite-modified asphalt and the modification mechanism of the modifier. Furthermore, the effects of the composite modifier at different doping amounts on the viscoelastic property of asphalt were explored through rheological tests, and then the prepared composite-modified asphalt was compared with matrix asphalt and SBS-modified asphalt. In addition, the modification mechanism of the composite modifier was investigated by fluorescence microscopy and infrared spectroscopy. The difference in pavement performance between the composite-modified asphalt and SBS-modified asphalt was compared by a rut test and dynamic modulus test. The research results showed that the composite modifier improved the high- and low-temperature performances and viscoelastic property of matrix asphalt. When the doping amount was raised to 9%, the composite-modified asphalt exhibited better a modification effect than SBS-modified asphalt. The rut test results indicated that composite-modified asphalt demonstrated a stronger deformation resistance than SBS-modified asphalt. The dynamic modulus test showed that the composite-modified asphalt has better viscoelastic properties and temperature sensitivity. Fluorescence microscopy suggested that the crosslinking between the composite modifier and asphalt forms a mesh structure which greatly improves its resistance to deformation. From infrared spectroscopy, the composite modifier clearly functions as a physical modifier. Full article
(This article belongs to the Special Issue Organic and Polymeric Materials: Synthesis, Properties and Applications)
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Figure 1

Figure 1
<p>Tested items and procedures.</p> Full article ">Figure 2
<p>Composite modifier used in this study.</p> Full article ">Figure 3
<p>Preparation process of composite-modified asphalt.</p> Full article ">Figure 4
<p>Rut life tester.</p> Full article ">Figure 5
<p>Rutting factors of asphalt under different degrees of aging: (<b>a</b>) OS; (<b>b</b>) RTFOT; (<b>c</b>) PAV.</p> Full article ">Figure 6
<p>Phase angle of asphalt under different degrees of aging: (<b>a</b>) OS; (<b>b</b>) RTFOT; (<b>c</b>) PAV.</p> Full article ">Figure 7
<p>Main curve of complex modulus of asphalt under different degrees of aging: (<b>a</b>) OS; (<b>b</b>) RTFOT; (<b>c</b>) PAV.</p> Full article ">Figure 8
<p>Recovery rate, non-recoverable creep compliance, and stress sensitivity coefficient of composite-modified asphalt: (<b>a</b>) R and R<sub>diff</sub>; (<b>b</b>) J<sub>nr</sub> and J<sub>nr-diff</sub>.</p> Full article ">Figure 9
<p>BBR test results of asphalt: (<b>a</b>) S; (<b>b</b>) M.</p> Full article ">Figure 10
<p>Rutting test results of asphalt mixture: (<b>a</b>) DS; (<b>b</b>) 1 cm rut life.</p> Full article ">Figure 11
<p>Main curve of dynamic modulus of asphalt mixture.</p> Full article ">Figure 12
<p>Images of 70# asphalt and ER-SBS-modified asphalt with fluorescence amplification of 40.</p> Full article ">Figure 13
<p>Infrared spectra of different types of asphalt.</p> Full article ">
10 pages, 15414 KiB  
Article
Protective Properties of Calcareous Deposit Layer for Cathodically Polarized AH36 Steel in Natural Seawater
by Quoc Quang Nong, Van Kien Dong, Van Trieu Nguyen, Van Chi Nguyen, Hong Quan Le and Nhat Linh Cao
Coatings 2024, 14(5), 644; https://doi.org/10.3390/coatings14050644 - 19 May 2024
Viewed by 996
Abstract
A calcareous deposit is a by-product of the cathodic polarization in seawater environments. This study presents the results of evaluating the anticorrosion and anti-macro-biofouling effectiveness of a calcareous deposit layer on the surface of the cathodically polarized AH36 structural steel in tropical seawater. [...] Read more.
A calcareous deposit is a by-product of the cathodic polarization in seawater environments. This study presents the results of evaluating the anticorrosion and anti-macro-biofouling effectiveness of a calcareous deposit layer on the surface of the cathodically polarized AH36 structural steel in tropical seawater. The polarization is induced with initial current densities at which the calcareous deposit layer formed with both aragonite and brucite for 12 months continuously. The protective properties of the layer were compared with those of the passive layer from corrosion products under the same environmental conditions. The macro-biofouling in the tropical seawater is observed in the closed and open surfaces of the steel. The comparison of the anticorrosion property shows that, to some degree, the calcareous deposit layer contributes to surface passivation, as in the case of the corrosion product layer. In addition, the composition of the brucite and aragonite in the calcareous layer in the study plays a role as a macro-biofouling growth-limiting factor. Full article
(This article belongs to the Special Issue Organic and Polymeric Materials: Synthesis, Properties and Applications)
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Figure 1
<p>The SEM image and the EDS spectrum of the calcareous deposit layer formed on the surface of the cathode for the first 4 h with current density of 3 A/m<sup>2</sup>.</p> Full article ">Figure 2
<p>XRD patterns collected on the surface of polarized AH36 structural steel at different current densities with diffraction peaks of aragonite (A) and brucite (B).</p> Full article ">Figure 3
<p>Polarization curve shifts of AH36 steel and cathodically polarized AH36 steel in natural seawater.</p> Full article ">Figure 4
<p>Changing trends of corrosion potential (<b>a</b>) and corrosion current density (<b>b</b>) for AH36 bare steel and AH36 polarized steel in natural seawater over time.</p> Full article ">Figure 5
<p>Round areas for electrochemical analyses on (<b>a</b>) the surfaces of AH36 steel and (<b>b</b>) cathodically polarized AH36 steel with natural seawater.</p> Full article ">Figure 6
<p>Nyquist diagrams of EIS measurements on samples with various time periods of polarization.</p> Full article ">Figure 7
<p>Equivalent circuit diagrams: (<b>a</b>) AH36 bare steel; (<b>b</b>) AH36 steel with substrate covered by calcareous deposits.</p> Full article ">Figure 8
<p>Two kinds of surfaces exposed for macro-biofouling experiment: (<b>a</b>) surface limited by PVC tube; (<b>b</b>) open surface of cathode.</p> Full article ">
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