The novel use of organo alkoxy silane for the synthesis of organic–inorganic hybrid coatings (original) (raw)
Related papers
The maleimide modified epoxy resins for the preparation of UV-curable hybrid coatings
Polymers for Advanced Technologies, 2011
In the present study, maleimide-modified epoxide resin containing UV-curable hybrid coating materials were prepared and coated on polycarbonate substrates in order to improve their surface properties. UV-curable, bismaleimide-modified aliphatic epoxy resin was prepared from N-(p-carboxyphenyl) maleimide (p-CPMI) and cycloaliphatic epoxy (Cyracure-6107) resin. The structure of the bismaleimide modified aliphatic epoxy resin was analyzed by FTIR and the characteristic absorption band for maleimide ring was clearly observed at 3100 cm S1 . Silica sol was prepared from tetraethylorthosilicate (TEOS) and methacryloxy propyl trimethoxysilane (MAPTMS) by sol-gel method. The coating formulations with different compositions were prepared from UV-curable bismaleimide-based epoxy oligomer and sol-gel mixture. The molecular structure of the hybrid coating material was analyzed by 29 Si-CP/ MAS NMR spectroscopy techniques. In the 29 Si CP/MAS NMR spectrum of the hybrid coating, mainly two kinds of signals were observed at S68 and S110 ppm that correspond to T 3 and Q 4 peaks, respectively. This result shows that a fully condensed structure was obtained. The thermal and morphological properties of these coatings materials were investigated by using TGA and SEM techniques. Hardness and abrasion resistance properties of coating materials were examined and both were found to increase with sol-gel precursor content of the coating. The photopolymerization kinetics was investigated by using RT-IR. 70% conversion was attained with the addition of 15 wt% of BMI resin into the acrylate-based coating formulation. It was found that the UV-curable organic-inorganic hybrid coatings improved the surface properties of polycarbonate.
Novel Organic-Inorganic Hybrid Nano-Composite Coatings by UV-initiated Sol-Gel Process
2010
UV-cure coatings have become systems of choice for plastic substrates, primarily due to their low-temperature cure, absence of potentially harmful solvents, and rapid curing. Free-radically curing acrylate resin systems are the most commonly used ones for commercial UV-cure systems for plastics. However, these systems have such inherent limitations as oxygen (air) inhibition of curing, poor substrate wetting, shrinkage, and odor that often limit their applications. A novel chemistry, utilizing silane compounds, has been explored to study its suitability as an acrylate-free UV-curable system. We have demonstrated that such systems undergo cross-linking reactions through a UV initiated sol-gel process resulting in the formation of hybrid organic-inorganic nanocomposite films. A systematic design of experiment (DOE) methodology has been used to study the effects of various parameters on the properties of the nanocomposite films deposited on polycarbonate substrates.
Progress in Organic Coatings, 2014
Urethane methacrylate trimethoxysilane (UAMS) organic-inorganic material was synthesized by the reaction of isophorone diisocyanate with hydroxyethyl methacrylate and aminopropyltrimethoxysilane. This precursor was then added to urethane trimethacrylate (UTMA); consequently, silica domains were appeared within the resulting ultraviolet (UV)-irradiated hybrid coatings. The sol-gel precursors having different amounts of UAMS as well as the UV-irradiated nanocomposite specimens were thoroughly characterized by FTIR, 1 H NMR, 13 C NMR, SEM, and TGA. The results provided support for the fact that thermo-mechanical properties of hybrid coatings were enhanced markedly by the incorporation of UAMS. This can be explained by the generation of Si-O-Si hard segments throughout the UV-cured films. Study on hardness and thermal stability behavior provided further evidences for the action of UAMS as coupling agent. Noticeably, thermal stability of hybrid coatings experienced an upward trend with the UAMS content, which can be inferred on the basis of strict restrictions on the mobility of polymer chains imposed by the crosslinked network.
2021
In this study, bromoacetic acid was reacted with 3-(mercaptopropyl) trimethoxy silane (MPTS) and trimethoxy silyl propyl thioacetic acid (TSTA) was produced. Also, bromoacetic acid was reacted with 3-(triethoxysilyl) propylamine (APTS), and triethoxysilyl propylamino acetic acid (TSPA) was synthesized. Finally, from a reaction between trimellitic anhydride (TMA) and APTS, trimellitylimidopropyl triethoxysilane (TMIS) resulted. In all reactions mentioned above, a carboxylic acid head and a trialkoxy silane tail including reactants were obtained. Furthermore, hybrid coatings based on methacrylated bisphenol A epoxy (MBAE) and synthesized carboxylic acids were obtained by photopolymerization. Polycarbonate substrates were utilized for preparation of transparent hybrid films. Then, the solvent resistance, hardness, gel content as well as the adhesion of coatings were measured as physical and mechanical properties. According to the obtained results, these properties of hybrid coatings im...
Organic–inorganic UV-cured methacrylic-based hybrids as protective coatings for different substrates
Progress in Organic Coatings, 2014
This paper describes the preparation of organic-inorganic (O-I) UV-cured hybrid systems as effective coatings for different substrates. Starting from methacrylic-siloxane monomers, two hybrid systems were produced, through hydrolysis and condensation reactions, and analyzed as a function of their composition. For comparison purposes, two control formulations, i.e. possessing the same organic composition of each hybrid, were also produced. In all the systems, the cross-linking reactions of the acrylic groups in the oligomer took place via free radical photo-polymerization reactions, controlled by a suitable photoinitiator.
Progress in Organic Coatings, 2014
In this study, three usual silane precursors, tetraethoxysilane (TEOS), vinyltrimethoxysilane (VTMS), and 3-methacryloxypropyltrimethoxysilane (MPS), and different binary and triplet blends of them were polymerized via a sol-gel method under acidic conditions. 29 Si NMR spectroscopy was used to characterize and quantify the degree of condensation of oligomers. The organic phase was based on a three-acrylate monomer trimethylolpropane triacrylate (TMPTA). The effect of prepared oligomers on the curing behavior of hybrid materials and the interaction between organic and inorganic phases were monitored via photo differential scanning calorimetry (Photo-DSC). Atomic force microscopy (AFM) was used to investigate the surface properties of UV-cured hybrid materials. Photo-DSC results showed that the addition of functionalized oligomers can increase both the photopolymerization rate and the final degree of conversion. They also indicated that oligomers containing MPS are more compatible with the organic phase than other oligomers. Topography and phase trace images of AFM showed that oligomers containing VTMS migrate to the surface of films and affect the water contact angle. In contrast to VTMS, the presence of MPS in oligomers causes the formation of covalent bonds between the organic and inorganic phases in the bulk of the film, and so the surface properties of the film remain unchanged.
Preparation and Characterization of Modified Silica-Epoxy Hybrid Ceramic Coatings
MATEC Web of Conferences
Hybrid sol-gel processing of inorganic-organic nanocomposites has been of a great interest over the last decades for being advantageous compared to the conventional addition methods of nanoparticles. In this study, a three-component system was adopted experiencing the design and preparation of different hybrid ceramic coatings based on Diglycidyl ether of Bisphenol A (Epoxy) and 3-Glycidyloxypropyl trimethyloxysilane (GLYMO) by sol-gel technique. The obtained hybrid coatings were cured using different hardeners, Diethylene triamine (DETA) as an organic linker and 3-Aminopropyl triethoxysilane (APTES) as an inorganic/organic linker. Microstructure assessment and the morphology of the prepared hybrids was investigated using FTIR and scanning electron microscopy (SEM) respectively. Mechanical properties (adhesion, and hardness) were determined. The degree of hydrophilicity of the hybrids was assigned depending on the contact angle measurements. Moreover, the thermal properties were investigated using thermogravimetric analysis (TGA). The results showed that the silica content plays an important role in determining the morphology as well as the mechanical, physical, and thermal properties of the coatings. The results showed an improvement in most of the properties of the hybrid coatings with increasing the silica content up to a certain extent. However, further increase in the silica content, leads to a clear deterioration.
Progress in Organic Coatings, 2006
This work involves the synthesis of novel hybrid oligomers based on a UV-curable epoxy acrylate resin (EA). The EA resin was modified with various amount of 3-isocyanatopropyl trimethoxysilane (IPTMS) coupling agent. The modification percentage of the hybrid oligomer was varied from 0 to 50 wt.%. UV-curable, hard and transparent organic-inorganic hybrid coatings were prepared on Plexiglas substrates and their characterization was performed by the analyses of various properties such as hardness, gloss, tape adhesion test and stress-strain test. Results from the mechanical measurements show that the properties of hybrid coatings improve with the increase in modification ratio. The thermal behavior of coatings was also evaluated. It is observed that the thermal stability of epoxy acrylate coatings is enhanced with incorporation of siloxane. Gas chromatography/mass spectrometry analyses showed that the initial weight loss obtained in thermogravimetric analysis is due to the degradation products of the photoinitator and the acrylic acid moiety of acrylic monomers.
Colloid and Polymer Science, 2017
UV-curable urethane acrylate oligomers are commonly used in coating application. For improving the properties of final coating, modification of the structure of oligomers via synthesis process is necessary. The purpose of the present study was synthesis of UV-curable urethane resins and improving its properties using organic-inorganic silicon coupling agent. The synthesized resin was characterized by FTIR and 1 HNMR. Also, scanning electron microscope (SEM), energydispersive X-ray spectroscopy (EDAX), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) were used for studying the final structure of hybrid coatings. The hardness and optical behaviors of coatings were studied too. The results confirm the formation of silica-based inorganic part in the structure of urethane acrylate oligomer providing a series of coatings having different hardness and optical properties.