Water Resistance of Poly(imide-siloxane) Adhesives: An IGC Surface Energetics Study |
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Authors: | Joyce M Kaltenecker-Commerçon T C Ward |
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Affiliation: | 1. Department of Chemistry and NSF Science &2. Technology Center: High Performance Polymeric Adhesives and Composites , Virginia Polytechnic Institute and State University , Blacksburg , Virginia , 24061 , USA |
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Abstract: | Inverse Gas Chromatography was utilized to examine the interaction of water vapor with the surfaces of a polyimide homopolymer and poly(imide-siloxane) random-block copolymers of increasing siloxane content. The studies employed 45-60 meter, thin-polymer-film mega-bore capillary columns to maximize surface area. The free energies of specific surface interaction with water and the dispersive components of the solid surface free energies were determined. An increase in the polymer siloxane content from 0-wt% to 10-wt% resulted in a decrease of approximately 4 kJ/mol in the free energy of water-specific surface interaction. A further increase in siloxane content to 30-wt% was not found to increase surface water resistance significantly. Dispersive components of the solid surface free energies of the copolymers were comparable to values reported for poly(dimethylsiloxane) homopolymer. |
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Keywords: | poly(imide-siloxane) copolymers adhesive water resistance interaction of water vapor with polymer surfaces free energy of specific interaction of water vapor dispersive component of polymer surface free energy capillary inverse gas chromatography |
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