Abstract
Cashew nut shell liquid (CNSL) is a cheap and renewable agro by-product that consists mainly of substituted phenols. A CNSL-based resin was used in this study to modify the properties of styrene-butadiene rubber (SBR). The resin was a copolymer obtained by condensing a mixture of phenol and CNSL with hexamethylenetetramine. The effect of the resin on the ageing properties of SBR vulcanizates was studied by following the changes in tensile strength, elongation at break, modulus and tear strength. CNSL directly and CNSL-based resins with different P:F ratios were incorporated into SBR and the physical properties determined. Comparison of the properties of the aged material containing CNSL resin with those of specimens not containing the resin shows improved ageing characteristics with respect to tensile strength, modulus and tear strength.
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