DIPOLE-MOMENTS OF COPOLYMERS IN RELATION TO THE DISTRIBUTION OF POLAR MONOMER UNIT SEQUENCES


KUCUKYAVUZ Z., BAYSAL B.

POLYMER, vol.32, no.18, pp.3418-3421, 1991 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 18
  • Publication Date: 1991
  • Doi Number: 10.1016/0032-3861(91)90547-v
  • Journal Name: POLYMER
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.3418-3421

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, mu(PP), when one of the nearest neighbours is polar and the other is non-polar, mu(PS), and when both of the nearest neighbours are non-polar, mu(SS). The relative magnitudes of mu(SS), mu(PS) and mu(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.