Abstract
AbstractBlend samples were prepared by physical blending of nonglycidyl‐type epoxy resin with varying weight ratios of carboxyl‐terminated butadiene acrylonitrile (CTBN) copolymer ranging between 0 and 25 wt%. The blend samples were cured with stoichiometric quantity of diamine. A comparative study of prepared blend samples by Fourier transform infrared (FTIR) spectroscopy showed the modification as a result of chemical reactions between cycloaliphatic epoxy, CTBN, and 4,4′‐diamino diphenyl sulfone. The impact strength of the blend systems increased up to 15 wt% addition of CTBN in the blend and decreased thereafter. The toughness and elongation at break increased, whereas tensile strength decreased up to 20 wt% loading of CTBN in the blends. Two‐phase morphology appeared with the incorporation of CTBN in the cycloaliphatic epoxy resin matrix. © 2008 Wiley Periodicals, Inc. Adv Polym Techn 26:258–271, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.20106
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