Abstract
A series of intercrosslinked networks (ICNs) based on silicone modified polyurethane (PU)–epoxy resins were developed. In this study, epoxy resin (diglycidyl ether of bisphenol-A) was modified with PU prepolymer and hydroxyl-terminated polydimethylsiloxane (HTPDMS) using γ-aminopropyl triethoxysilane (γ-APS) as silane cross linker and dibutyltindilaurate (DBTL) as catalyst to form ICNs. Aromatic polyamine adduct (A), diethylenetriamine (B) and polyamidoamine (C) were used as epoxy curatives. The final products were obtained in the form of tough films. Changes in chemical structure during ICN formation, mechanical and electrical properties were investigated using FT-IR spectra, tensile, impact and dielectric testing. The mechanical properties were enhanced with incorporation of PU (10 wt %) and silicone (10 wt %) due to the toughening of brittle epoxy matrices. Electrical properties showed a marginally decreasing trend with the incorporation of PU (0–20 wt %) influenced by the polar urethane linkages whereas silicone incorporation (10 wt %) showed an enhancement due to the presence of inorganic –Si–O–Si– linkage. Among the systems studied, the silicone (10 wt %) modified PU (10 wt %)–epoxy cured with “A” exhibited excellent mechanical and electrical characteristics and can be used as coatings and composites for industrial, electrical and marine components.
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