Dipole moments of some styrene copolymers

Abstract

Dipole moments of poly(styrene-co-p-chlorostyrene), poly(styrene-co-p-methoxystyrene), poly(styrene-co-4-vinylpyridine), and poly(styrene-co-N-vinylcarbazole) copolymers were determined in toluene solutions at different temperatures. The samples were synthesized by using free-radical initiators. The effects of the nature of the polar group, composition, and temperature on the dipole moment ratio were investigated.The mean-square dipole moment per structural unit shows a positive deviation from linearity, in agreement with calculations by Mark based on rotational isomeric state theory. The results are compared with other experimental and theoretical studies. IntroductionThe mean-square dipole moment of a chain ( p 2 ) is an important configuration-dependent property that can be determined experimentally in dilute solutions or in bulk,

Dipole moments of styrene/4‐vinylpyridine copolymers—I: Relation to the fraction of polar component

“…Both positive and negative temperature coefficients have been reported. 6 No changes with temperature have also been reported for some…”