Abstract
Cashew nut shell liquid (CNSL) is a cheap agro-by-product and renewable resource that consists mainly of substituted phenols. A CNSL-based resin was used in this study to modify the properties of the elastomers Isobutylene-Isoprene Rubber (IIR) and Natural Rubber (NR). The resin was a copolymer obtained by condensing a mixture of phenol and CNSL with hexamethylenetetramine. The effect of the resin on the aging properties of elastomers was studied by following changes in tensile strength, elongation at break, modulus, and tear strength. Comparison of the properties of the aged material containing resin with those of specimens not containing any modifiers shows improved aging characteristics with respect to tensile strength, modulus, and tear strength for IIR.
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