Effect of Phenol-CNSL Formaldehyde Copolymer on Thermal Ageing of Elastomers

Author: Mary Lubi  

Publisher: Taylor & Francis Ltd

ISSN: 0091-4037

Source: International Journal of Polymeric Materials, Vol.56, Iss.7, 2007-07, pp. : 697-713

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Abstract

Cashew nut shell liquid (CNSL) is a cheap agro-byproduct 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, chloroprene, CR and ethylene propylene rubber, EPDM. 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 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 ageing characteristics with respect to tensile strength, modulus, and tear strength.