(29)Si Solid State NMR Studies of the Effect of Composition of Amine and AlkylSilane Blends in Tertiary Amine-Catalyzed Anhydride-Cured Epoxy Mixtures

摘要

Silane coupling agent blends of gamma-aminopropyltriethoxysilane (APS) andbutyltriethoxysilane (BTS) of varying composition were added to an epoxy matrix made of a benzyldimethylamine (BDMA)-catalyzed, nadic methyl anhydride (NMR) was utilized in order to determine the effect of composition of the silane coupling agent blend on the mobility of the various portions of the siloxane network. It was found that hydrolysis caused an increase in the rigidity of the highly condensed structures, but decreased the rigidity of the silicon atoms bonded to only one or two oxygen atoms. This phase separation could possibly lead to stress concentration within the network structure. Increasing amine concentration caused only slight increases in rigidity. Although ETS gave consistently lower rigidity values than BTS, these values were not statistically significant.