Polydimethylsiloxane/silica hybrid coatings protecting Kapton from atomic oxygen attack

ABSTRACTIt is important to develop flexible transparent polymer films having high gas barrier properties and abrasion resistance because new applications involving transparent polymer films for flat panel displays require these properties. We report on organic-inorganic hybrid coatings of polyvinylalcohol (PVA)/polyacrylicacid (PAA)-silica, which have high gas barrier properties almost equivalent to those achieved by the dry coating process. The hybrid coatings were prepared by the sol-gel reaction of alkoxysilane in a PVA/PAA aqueous solution. In order to obtain transparent coating films, 3-aminopropyltrimethoxysilane (APTMOS) was used as a compatibilizer in the sol-gel reaction of tetramethoxysilane (TMOS). No structure could be seen in the TEM of the cross-sectional coating layer, indicating that polymers and silica were mixed homogeneously. PVA/PAA-silica hybrid coatings were shown to have excellent abrasion resistance based on the ΔHaze index. O2 permeability of PVA/PAA-silica hybrid coatings evaluated by MOCON under the conditions of 23°C, 90% RH was lower than that of PVA/PAA polymer coating, which suggests that silica affects the barrier property of the hybrid coating in humid conditions. Furthermore, O2 permeability decreased as silica content increased in the coatings. Unexpectedly, high gas barrier properties appeared when the silica content exceeded 50 wt%. From the result of element distribution analysis measured by EF-TEM, it was confirmed that phase separation occurred between PVA/PAA and silica on a nanometer scale and silica forms continuous structures, which are considered to suppress O2 permeability.

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Polyimide–silica hybrid coatings: morphological, mechanical, and thermal investigations

Polymers for Advanced Technologies ◽

10.1002/pat.909 ◽

2007 ◽

Vol 18 (6) ◽

pp. 490-496 ◽

Cited By ~ 40

Author(s):

S. Karataş ◽

N. Kayaman-Apohan ◽

H. Demirer ◽

A. Güngör

Keyword(s):

Hybrid Coatings ◽

Thermal Investigations ◽

Silica Hybrid

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Green fabrication of ultraviolet curable epoxy acrylate-silica hybrid coatings

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2017.04.015 ◽

2017 ◽

Vol 109 ◽

pp. 38-44 ◽

Cited By ~ 9

Author(s):

Fengguo Liu ◽

Linqing Miao ◽

Ying Wang ◽

Xiangxin Xue ◽

He Yang

Keyword(s):

Hybrid Coatings ◽

Epoxy Acrylate ◽

Ultraviolet Curable ◽

Silica Hybrid

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Multifunctional polypyrene/silica hybrid coatings with stable excimer fluorescence and robust superhydrophobicity derived from electrodeposited polypyrene films

Journal of Materials Chemistry C ◽

10.1039/c4tc02653e ◽

2015 ◽

Vol 3 (9) ◽

pp. 2086-2092 ◽

Cited By ~ 21

Author(s):

Lianyi Xu ◽

Faqin Tong ◽

Xuemin Lu ◽

Kai Lu ◽

Qinghua Lu

Keyword(s):

Large Scale ◽

Hybrid Film ◽

Hybrid Coatings ◽

Superhydrophobic Coating ◽

Excimer Fluorescence ◽

Silica Hybrid

A fluorescent and robust superhydrophobic coating based on a fluorinated polypyrene/silica hybrid film was prepared readily on the large-scale substrates.

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Effect of Amino-Modified Silica Nanoparticles on the Corrosion Protection Properties of Epoxy Resin-Silica Hybrid Materials

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.086 ◽

2008 ◽

Vol 8 (6) ◽

pp. 3040-3049 ◽

Cited By ~ 26

Author(s):

Kung-Chin Chang ◽

Hui-Fen Lin ◽

Chang-Yu Lin ◽

Tai-Hung Kuo ◽

Hsin-Hua Huang ◽

...

Keyword(s):

Epoxy Resin ◽

Corrosion Protection ◽

Hybrid Materials ◽

Sol Gel ◽

Covalent Bond ◽

Surface Hydrophobicity ◽

Hybrid Coatings ◽

Morphological Observation ◽

Modified Silica ◽

Silica Hybrid

In this paper, a series of organic–inorganic hybrid materials consisting of epoxy resin frameworks and dispersed nanoparticles of amino-modified silica (AMS) were successfully prepared. First of all, the AMS nanoparticles were synthesized by carrying out the conventional acid-catalyzed sol–gel reactions of tetraethyl orthosilicate (TEOS) in the presence of (3-aminopropyl)-trimethoxysilane (APTES) molecules. The as-prepared AMS nanoparticles were then characterized by FTIR, 13C-NMR and 29Si-NMR spectroscopy. Subsequently, a series of hybrid materials were prepared by performing in-situ thermal ring-opening polymerization reactions of epoxy resin in the presence of as-prepared AMS nanoparticles and raw silica (RS) particles. The as-prepared epoxy-silica hybrid materials with AMS nanoparticles were found to show better dispersion capability than that of RS particles existed in hybrid materials based on the morphological observation of transmission electron microscopy (TEM). The hybrid materials containing AMS nanoparticles in the form of coating on cold-rolled steel (CRS) were found to be much superior in corrosion protection over those of hybrid materials with RS particles when tested by a series of electrochemical measurements of potentiodynamic and impedance spectroscopy in 5 wt% aqueous NaCl electrolyte. The increase of corrosion protection effect of hybrid coatings may have probably resulted from the enhancement of the adhesion strength of the hybrid coatings on CRS coupons, which may be attributed to the formation of Fe—O—Si covalent bond at the interface of coating/CRS system based on the FTIR-RAS (reflection absorption spectroscopy) studies. The better dispersion capability of AMS nanoparticles in hybrid materials were found to lead more effectively enhanced molecular barrier property, mechanical strength, surface hydrophobicity and optical clarity as compared to that of RS particles, in the form of coating and membrane, based on the measurements of molecular permeability analysis, dynamic mechanical analysis, contact angle measurements and ultraviolet-visible transmission spectra, respectively.

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