Abstract
The effect of the addition of two types of epoxidized novolac resins separately to cold-set bisphenol-A-based epoxy resin has been investigated in this study. Bisphenol A epoxy resins containing 2.5-20 wt% of epoxy novolac are cured in the presence of a polyamide hardener and tested for thermal and mechanical properties, hardness, water absorption, etc. Blends containing 10-15 wt% of epoxy novolac show substantial improvement in properties, such as tensile strength, elongation, and energy absorbed to break. The novolac derived from p-cresol is better than that based on phenol in enhancing the properties. The property profiles of these blends imply a toughening action by the novolac epoxies. The blends also exhibit improved thermal stability compared to the neat resin.
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