Nonlocal dielectric response in dipolar polymers

M. Warner; M. E. Cates

doi:doi:10.1051/jp2:1993147

Numéro		J. Phys. II France Volume 3, Numéro 4, April 1993


Page(s)		503 - 513
DOI		https://doi.org/10.1051/jp2:1993147

DOI: 10.1051/jp2:1993147
J. Phys. II France 3 (1993) 503-513

Nonlocal dielectric response in dipolar polymers

M. Warner and M. E. Cates

Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, Great-Britain

(Received 15 October 1992, accepted 5 January 1993)

Abstract
We calculate the nonlocal dielectric susceptibility $\chi ({\bf r}-{\bf r}')$ for a fluid of rods carrying dipoles pointing along their axes. At short distances, of order the rod diameter, we get a value of $\chi$ considerably smaller than that of a fluid of individual monomers. At distances comparable to the rod length, $\chi$ climbs to a value N times larger than a fluid of monomers, as expected. In between these two limits dipolar rods are predicted to exhibit a form of Debye-Hückel screening. the relevance to internal field calculations and to direct experiments is pointed out. We also calculate the response of dipolar Gaussian chains.