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Abstract

The terpolymerizations of acrylonitrile, styrene, and seven esters of α-cyanocinamic acid were investigated up to low conversions. Polymerizations, carried out in bulk at 70°C, were initiated by free radicals. The relationships between monomer feed and terpolymer composition were determined on a triangular coordinate graph as proposed by Slocombe. In all cases, there exists an azeotropic line, connecting the binary azeotrope of the pair acrylonitrile-styrene and that of the various pairs of styrene with the esters of α-cyanocinnamic acid, yet no real ternary azeotrope was found.