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Organic Synthesis and Characteristics of Thin Films Second Volume
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Organic Synthesis and Characteristics of Thin Films Second Volume

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

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 7381

Special Issue Editor

Prof. Dr. Tzi-yi Wu

E-Mail Website
Guest Editor
Department of Chemical Engineering and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan
Interests: electrochromic polymers; light-emitting diodes; solar cell; fuel cell; functional polymers and materials for optoelectronic devices
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Organic synthesis includes many types of interesting reactions, and it is an excellent technology for the mass production of polymers with thin film formations. The synthesized polymers can be applied to various scientific fields, especially energy fields such as electrochromism, dye-sensitized solar cells, organic catalysis, supercapacitors, and polymers’ thin films. There are several methods of preparing thin films. The thickness of polymer films ranges from 10−10 m to 10−6 m. Many novel effective organic synthetic methods are still being studied and published. Therefore, topics of interest have focused on the preparation of many types of organic and polymeric derivatives with thin film formations in organic synthesis, for generating both new carbon–carbon (C-C) and carbon–heteroatom (C-X) bonds. The organic and polymeric derivatives will be used as precursors for highly functionalized materials.

The Special Issue “Organic Synthesis and Characteristics of Thin Films Second Volume” aims to present the most recent achievements in the organic synthesis not only of organic and polymeric derivatives with thin film formation but also of their applications. In addition, feature articles and review papers about the progress of thin film materials in particular areas are also welcome.

In particular, topics of interest include but are not limited to the following:

  • Brushed, main-chain, and cross-linking types of polymers;
  • Optoelectronic functional thin films;
  • Properties and characteristics of thin films;
  • Thin film applications;
  • Polymer thin films.

Prof. Dr. Tzi-yi Wu
Guest Editor

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.

Published Papers (6 papers)

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Research

11 pages, 2028 KiB  
Article
Design of an Azopolymer for Photo-Switchable Adhesive Applications
by David Siniscalco, Laurence Pessoni, Anne Boussonnière, Anne-Sophie Castanet, Laurent Billon, Guillaume Vignaud and Nicolas Delorme
Coatings 2024, 14(3), 275; https://doi.org/10.3390/coatings14030275 - 24 Feb 2024
Cited by 1 | Viewed by 862
Abstract
Significant research endeavors have been devoted to developing adhesives with reversible switching capabilities, allowing them to activate adhesion in response to diverse environmental stimuli. Among these, photo-switchable adhesives stand out as particularly promising. The presence of a photo-reversible solid-to-liquid transition, characterized by a [...] Read more.
Significant research endeavors have been devoted to developing adhesives with reversible switching capabilities, allowing them to activate adhesion in response to diverse environmental stimuli. Among these, photo-switchable adhesives stand out as particularly promising. The presence of a photo-reversible solid-to-liquid transition, characterized by a transition temperature (TSL), in certain azobenzene-containing polymers offers a compelling avenue for creating such adhesives. The development of a method based on Atomic Force Microscopy to measure both the glass transition temperature (Tg) and TSL provided an opportunity to investigate the impact of various structural parameters on the solid-to-liquid transition of azopolymers. Our findings revealed that increasing the molecular weight (Mn) from 3400 to 8100 g/mol needed to achieve a highly cohesive adhesive resulted in an elevation in TSL (>10 °C), making the solid-to-liquid transition at room temperature more challenging. However, incorporating a highly flexible substituent at the para position of the azobenzene group proved effective in significantly reducing the TSL value (from 42 °C to 0 °C). This approach allows for the creation of photo-switchable adhesives with intriguing properties. We believe that our results establish a pathway toward developing a robust room-temperature photo-switchable adhesive. Full article
(This article belongs to the Special Issue Organic Synthesis and Characteristics of Thin Films Second Volume)
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22 pages, 7699 KiB  
Article
The Use of Polyurethane Composites with Sensing Polymers as New Coating Materials for Surface Acoustic Wave-Based Chemical Sensors—Part I: Analysis of the Coating Results, Sensing Responses and Adhesion of the Coating Layers of Polyurethane–Polybutylmethacrylate Composites
by Michael Rapp, Achim Voigt, Marian Dirschka and Mauro dos Santos de Carvalho
Coatings 2023, 13(11), 1911; https://doi.org/10.3390/coatings13111911 - 08 Nov 2023
Viewed by 676
Abstract
The sensing layers for surface acoustic wave-based (SAW) sensors are the main factor in defining the selectivity and reproducibility of the responses of the sensor systems. Among the materials used as sensing layers for SAW sensors, polymers present a wide range of advantages, [...] Read more.
The sensing layers for surface acoustic wave-based (SAW) sensors are the main factor in defining the selectivity and reproducibility of the responses of the sensor systems. Among the materials used as sensing layers for SAW sensors, polymers present a wide range of advantages, from availability to a large choice of chemical-sensing environments. However, depending on the physical–chemical properties of the polymer, issues about the chemical and mechanical stability of the sensing layer have been reported that can compromise the application of sensor systems in the long-term. The sensor properties are defined basically by the properties of the coating material and the quality of the coating process. The strategy used to improve the properties of polymeric coating layers for SAW technology involved the use of polyurethane (PU) in combination with a second polymer that is responsible for the sensing properties of the resulting layer; this is obtained by a reproducible and robust coating procedure. In this first part of our research, we used polymer composites of different compositions of polybutylmetacrylate (PBMA) as the sensing polymer with polyurethane. The analysis of the coating (ultrasonic parameters), the relative sensor responses and the adhesion results for the PU–PBMA composites were determined. The ultrasonic analysis and the relative sensor responses showed very reproducible and precise results, indicating the reproducibility and robustness of the coating process. Accurate correlations between the results of the ultrasonic parameters due to the coating and the relative sensor responses for the organic analytes analyzed were obtained, showing a precise quantitative relationship between the results and the constitution of the composite coating materials. The composites show practically no significant sensor responses to water. The PU–PBMA composites substantially enhanced adhesion to the surface of the piezoelectric sensor element in comparison to the coating with pure PBMA, without loss of its sensing properties. Other PU–polymer composites will be presented in the future, as well as an analysis of the selectivity for the organic analytes for these types of coating materials. Full article
(This article belongs to the Special Issue Organic Synthesis and Characteristics of Thin Films Second Volume)
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19 pages, 6125 KiB  
Article
Structural and Luminescence Properties of Eu-Doped PMO Films with Ethylene Bridge and Methyl Terminal Groups
by Md Rasadujjaman, Jinming Zhang, Alexey S. Vishnevskiy, Jing Zhang and Mikhail R. Baklanov
Coatings 2023, 13(9), 1656; https://doi.org/10.3390/coatings13091656 - 21 Sep 2023
Viewed by 721
Abstract
Eu-doped periodic mesoporous organosilicate (PMO) films with terminal methyl and ethylene bridging groups have been synthesized using sol-gel technology and spin-coating, employing evaporation-induced self-assembly (EISA), on silicon wafers. Eu doping is achieved by the dissolution of Eu(NO3)3·6H2O [...] Read more.
Eu-doped periodic mesoporous organosilicate (PMO) films with terminal methyl and ethylene bridging groups have been synthesized using sol-gel technology and spin-coating, employing evaporation-induced self-assembly (EISA), on silicon wafers. Eu doping is achieved by the dissolution of Eu(NO3)3·6H2O in the precursor solution. The deposited films are characterized using Fourier transform infrared (FTIR) spectroscopy, ellipsometric porosimetry (EP), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy. It is observed that Eu doping reduces the concentration of terminal methyl groups, makes the films more hydrophilic and reduces the pore size and open porosity. The reduction reaction Eu3+ → Eu2+ occurs in the pores of organosilicate glass (OSG) films, which was confirmed by the depth profiling XPS. Eu3+ was still present on the top surface of the films. The presence of Eu3+ and Eu2+ gives luminescence emission in the range of 600–630 nm (Eu3+) and 290–400 nm (Eu2+). The Eu2+/Eu3+ concentrations ratio depends on CH3 groups concentration in the films. The concentration of Eu2+ ions in the pores can be reduced by exposure to inductively coupled (ICP) oxygen plasma. The observed shift in the luminescence spectra towards the UV region, in comparison to previously reported Eu-doped organosilicate films, can be attributed to the energy transfer occurring between the host material and Eu2+ ions. Full article
(This article belongs to the Special Issue Organic Synthesis and Characteristics of Thin Films Second Volume)
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15 pages, 3649 KiB  
Article
Application of Magnesium Hydroxide/Diphenoxy Phosphate in Silicone Rubber Flame Retardant Cable Material
by Wei Wang, Fan Yang, Yunlai Lu, Zhi Luo, Fangya Li, You Wu, Jianbing Zhang, Zufeng Xiao, Wei Li and Caiqin Qin
Coatings 2023, 13(5), 934; https://doi.org/10.3390/coatings13050934 - 16 May 2023
Viewed by 1200
Abstract
Deketoxime–type room–temperature vulcanized silicone rubber cable materials were prepared using α, ω–dihydroxy polydimethylsiloxane, carbon black, calcium carbonate, magnesium hydroxide, piperazine bis (diphenoxy phosphate) salt (PBDP), and melamine diphenoxy phosphate (MDP). The effects of carbon black and flame retardants on the mechanical properties, flame–retardant [...] Read more.
Deketoxime–type room–temperature vulcanized silicone rubber cable materials were prepared using α, ω–dihydroxy polydimethylsiloxane, carbon black, calcium carbonate, magnesium hydroxide, piperazine bis (diphenoxy phosphate) salt (PBDP), and melamine diphenoxy phosphate (MDP). The effects of carbon black and flame retardants on the mechanical properties, flame–retardant properties, and electrical insulation properties of silicone cable coatings were investigated. The research results showed that the products obtained had good mechanical and electrical insulation properties, with tensile strength greater than 3.0 MPa, dielectric strength greater than 22 kV/mm, and volume resistivity higher than 6.5 × 1014 Ω·cm. When 30 parts of Mg(OH)2:MDP = 2:1 are added to 100 parts of resin, the flame–retardant performance of wire and cable materials can be significantly improved. Under the thermal radiation illumination of 50 kW/m2, the ignition time (TTI) of the Mg(OH)2/MDP coating increased by 16 s, and the maximum heat release rate (pkHRR) and total heat release rate (THR) decreased by 29.7% and 68.8%, respectively, compared with silicone rubber without flame retardant. The silicone rubber coatings prepared were flame retardant up to the FV–1 level. Full article
(This article belongs to the Special Issue Organic Synthesis and Characteristics of Thin Films Second Volume)
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15 pages, 2189 KiB  
Article
Preparation of Polyurethane-Modified Silicone Rubber Insulating Coating and Its Application in 10 kV Overhead Bare Wire Wrapping
by Wei Wang, Fan Yang, Pan Zhang, Zhi Luo, Fangya Li, Jingjing Jiang, Jianbing Zhang, Wei Li, Aimei Liu and Caiqin Qin
Coatings 2023, 13(5), 837; https://doi.org/10.3390/coatings13050837 - 26 Apr 2023
Viewed by 1632
Abstract
Room-temperature vulcanized rubber is an excellent polymer material with excellent electrical insulation and mechanical properties, which can be used for field insulation of high-voltage bare wire. In this paper, a room-temperature cured coating material was prepared from α,ω-dihydroxy polydimethylsiloxane (PDMS), polyurethane-modified silicone material [...] Read more.
Room-temperature vulcanized rubber is an excellent polymer material with excellent electrical insulation and mechanical properties, which can be used for field insulation of high-voltage bare wire. In this paper, a room-temperature cured coating material was prepared from α,ω-dihydroxy polydimethylsiloxane (PDMS), polyurethane-modified silicone material (PU-Si), and Methyltris(methylethylketoxime) silane (MOS). The study showed that the coating made by adding PDMS (70 g), PU-Si (30 g), CaCO3 (90 g), MOS (7 g), KH792 (5 g), and Mg(OH)2 (30 g) had a surface drying time of 19.1 min, tensile strength of 3.2 Mpa, volume resistivity greater than 4 × 1014 Ω·cm, breakdown voltage greater than 20 kV/mm, and flame retardant performance of the FV-1 level. The comprehensive performance of the insulation material meets the national standard of “Aerial insulated cables for rated voltage of 10 kV” (GB/T14049-2008), while the insulation material has been successfully applied to the overhead line renovation project of the State Grid Hubei Electric Power Company (Wuhan, China). Full article
(This article belongs to the Special Issue Organic Synthesis and Characteristics of Thin Films Second Volume)
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14 pages, 4332 KiB  
Article
Synthesis and Characterization of Co-Modified Polyurethane Nanocomposite Latexes by Terminal and Pendant Fluoroalkyl Segments
by Hua Jin, Fuquan Deng and Wei Xu
Coatings 2023, 13(3), 557; https://doi.org/10.3390/coatings13030557 - 05 Mar 2023
Viewed by 1853
Abstract
To further improve the hydrophobic and thermal properties of fluorinated polyurethane (FPU), we initially prepared the fluorine- and silicon-containing pendant groups’ diols (DEFA and DESiA) by Michael addition reaction. Next, we synthesized a series of co-modified polyurethane nanocomposite (TPFPU-SiO2) latexes by [...] Read more.
To further improve the hydrophobic and thermal properties of fluorinated polyurethane (FPU), we initially prepared the fluorine- and silicon-containing pendant groups’ diols (DEFA and DESiA) by Michael addition reaction. Next, we synthesized a series of co-modified polyurethane nanocomposite (TPFPU-SiO2) latexes by terminal and pendant fluoroalkyl segments via varying the additive amount of silica sols. Structure and performance properties of the target materials were characterized by IR, TEM, TGA, DSC, XRD, XPS, SEM, AFM, and contact angle measurements. Results showed that with the increase in silica sols dosage, the mean particle size of the TPFPU-SiO2 latexes was increased and their emulsion stability gradually decreased. The thermal stability of the TPFPU-SiO2 films were gradually increased and hydrophobicity of the TPFPU-SiO2 films increased first and then slightly decreased. The maximum water contact angle on the TPFPU-SiO2 films was 119.8° and the lowest water absorptivity was 2.49%. Thus, these novel fluorinated polyurethane nanocomposite latexes can find valuable applications in heat-resistant and anti-fouling coatings. Full article
(This article belongs to the Special Issue Organic Synthesis and Characteristics of Thin Films Second Volume)
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