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Tailoring of elastomeric grafted coating via sol–gel chemistry of crosslinked polymethylhydrosiloxane
Author(s) -
Thami Thierry,
Bresson Bruno,
Fretigny Christian
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25295
Subject(s) - triethoxysilane , materials science , coating , sol gel , polymer , contact angle , elastomer , chemical engineering , micrometer , dip coating , polymer chemistry , fourier transform infrared spectroscopy , composite material , nanotechnology , optics , physics , engineering
Thin coating of crosslinked polymethylhydrosiloxane are grafted on silica using sol–gel process that leads to polymer layers tailored in term of thickness and elasticity. The degree of crosslinking is tuned by sol–gel polycondensation of a mixture of methyldiethoxysilane(DH) HSi(CH 3 )(OCH 2 CH 3 ) 2 and triethoxysilane (TH) HSi(OCH 2 CH 3 ) 3 , yielding triethoxysilane‐based networks. Samples with well‐defined thicknesses from nanometer to micrometer range are prepared by sol–gel dip‐coating method on silicon surface. Homogeneous or gradient‐thickness coating can be produced in this way. It results in surface‐attached networks bearing SiH functionalities covalently anchored to the substrate. Powdered gels of DH/TH composition from 50/50 to 95/5 (mol %) were also prepared for a comparison purpose. The structure of the gels was investigated by NMR and FTIR, showing that DH/TH mixtures react totally to yield homogeneous matrix. The surface‐attached polymer films are very stable and present high hydrophobicity as evidenced by contact angle measurements. Their surface and mechanical properties have been qualitatively studied using the atomic force microscopy. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1504–1516, 2007