Modification of NBR by Addition of Phenol-CNSL Formaldehyde Copolymer

Abstract

This paper reports the results of employing a Cashew Nut Shell Liquid (CNSL) based resin for modifying the properties of NBR. The resin is a copolymer obtained by condensing a mixture of phenol and CNSL with hexamethylene tetramine (hexa) at a stoichiometric ratio of 1:2.9 between total phenol and formaldehyde generated from hexa. The synthesis procedure, characterization and method of incorporation into the NBR compound are described. Sheets moulded from the compound have been subjected to different aging periods viz. 24 hrs, 48 hrs, 72 hrs and 96 hrs at 100°C and various properties were evaluated. Comparison of the properties of the aged material containing resin with those of NBR specimens not containing the resin show improved aging characteristics with respect to tensile strength, modulus and tear strength at aging periods in excess of 72 hours.

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