Journal
ADVANCES IN POLYMER TECHNOLOGY
Volume 24, Issue 2, Pages 91-102Publisher
WILEY-HINDAWI
DOI: 10.1002/adv.20033
Keywords
compatibilization; curing of polymers; dynamic mechanical properties; networks; silane coupling agents; solvent absorption
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Following previous work on the compatibilization of organic-inorganic hybrids through coupling reactions with the precursor components, the present study evaluates the relative efficiency of different types of coupling agents on the morphology and properties of epoxy-silica hybrids. In particular, this investigation compares the effects of introducing trialkoxysilane functional groups at the chain end (using amine- and mercapto-silanes) with similar types grafted in the middle of the chain of the constituent resin (using an isocyanate silane). The use of coupling agents with a basic character (amine silane type) brings about the formation of denser networks in both constituent phases of the resulting epoxy-silica hybrid, which is manifest through a large increase in the T-g and a more extensive suppression of the molecular relaxations within the glass transition regions. Increasing the number of alkoxysilane functional groups at the chain end, with the use of a bis-aminosilane, has a relatively minor effect on the morphology and dynamic mechanical spectra of the resulting epoxy-silica hybrids. It was also found that while the incorporation of small amounts of a high molecular weight epoxy resin causes considerable plasticization of the organic phase, much larger amounts of organic (aliphatic) co-agent within the siloxane phase are required to deteriorate those properties that are related to the inorganic character of the hybrid material. (c) 2005 Wiley Periodicals, Inc.
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