Dipole moments of copolymers in relation to the distribution of polar monomer unit sequences

Abstract

A method for evaluating the dipole moments of copolymers in relation to the distribution of polar unit sequences is proposed. Experimental data on the synthesis and dipole moments of styrene- p-chlorostyrene and styrene- p-methoxystyrene copolymers were used to calculate the effective dipole moment of a polar unit in a copolymer. For this purpose, we assumed the following effective moment values for the corresponding polar unit sequences along the copolymer chains: when both of the nearest neighbours are polar, μ PP, when one of the nearest neighbours is polar and the other is non-polar, μ PS, and when both of the nearest neighbours are non-polar, μ SS. The relative magnitudes of μ SS, μ PS and μ PP calculated for both copolymers reflect the influence of dipole-dipole interactions on the effective dipole moment of a polar unit in a copolymer molecule.