Porous structure and thermal stability of photosensitive silica/polyimide composites prepared by sol-gel process

doi:10.1002/app.30790

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Title:	Porous structure and thermal stability of photosensitive silica/polyimide composites prepared by sol-gel process
Authors:	Huang, Shu-Hui;Don, Trong-Ming;Lai, Wei-Chi;Chen, Ching-Chung;Cheng, Liao-Ping
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	composites;dielectric properties;silicas;polyimides;morphology
Date:	2009-11
Issue Date:	2011-05-20 09:56:45 (UTC+8)
Publisher:	Hoboken: John Wiley & Sons, Inc.
Abstract:	The sol-gel method was employed to synthesize an inorganic–organic photosensitive composite material, silica/polyimide. Silica was covalently bonded to polyimide by introduction of 1,4-aminophenol as a coupling agent. A photosensitive cross-linking agent, 2-(dimethylamino) ethyl methacrylate, was used to engender UV sensitivity to the composite. Using field emission scanning electron microscope imaging at very high magnifications, the composite film was found to exhibit a porous cross-sectional structure. The pores were interconnected to form numerous continuous channels within the matrix and silica particles were attached to the pore wall of the polyimide host. Depending on the preparation conditions, the size of the silica particles could vary from 20 nm to a few μm. The thermal degradation temperatures, dynamic mechanical properties, glass transition temperatures, thermal expansion coefficients, and dielectric constants of various silica/polyimide composites were measured, and the results indicated that incorporation of silica could improve the thermal and dimensional stabilities of the polyimide. Also, because the silica/polyimide composite had a porous interior structure, it had a rather low dielectric constant with the lowest achievable value being 1.82.
Relation:	Journal of Applied Polymer Science 114(4), pp.2019-2029
DOI:	10.1002/app.30790
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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