| 초록 |
Modification of brittle epoxy resin systems to increase flexibility is usually performed with elastomers. Poly(dimehyl siloxane) (PDMS) may be a proper toughening agent for epoxy resins due to their low glass transition temperature, good thermal and oxidation stability, and weatherability. However, epoxy resins and PDMS are immiscible and difficult to mix. In this study, segmented copolymers of hydrogenated bisphenol-A type epoxy resins and diglycidyl ether of PDMS were prepared using an anhydride curing agent by two step process. The copolymers were prepared by curing at different temperatures. The thermal and mechanical properties of the copolymers of epoxy resins were especially investigated. The copolymers cured at 180°C were transparent while those cured at 140°C were translucent. The transparent sample show a single glass transition temperature lower than that of diglycidyl ether of PDMS. |
