Accession Number : ADP007482

Title :   Dielectric, TSC and Electromechanical Measurements on Some Prospective NLO Polymers,

Corporate Author : LEEDS UNIV (UNITED KINGDOM) DEPT OF PHYSICS

Personal Author(s) : Carr, Paul L. ; Daviess, Geoff R. ; Ward, Ian M.

Report Date : FEB 1991

Pagination or Media Count : 8

Abstract : The pyroelectric coefficients of a range of polymers with a methacrylate backbone and nitrostilbene or nitrobipheny mesogens attached by a 3 or 6 carbon spacer have been measured in order to assess the efficiency of the poling process. It is found that the response is much lower than the guest-host system MNA in PMMA, suggesting that the polar mesogens pack anti-parallel and that this alignment is not broken by the applied field. These strong interactions also provide an explanation for the absence of the B relaxation process in the experimental polymers and therefore the brittle nature of the films. They may also explain the stability of the polarisation achieved.

Descriptors :   *METHACRYLATES, ALIGNMENT, CARBON, COEFFICIENTS, EFFICIENCY, FILMS, INTERACTIONS, POLYMERS, RELAXATION, RESPONSE, SPACERS, STABILITY.

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE