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.
This article is from 'Multifunctional Materials Held in Boston, Massachusetts on November 29-December 1 1989. Materials Research Society Symposium Proceedings. Volume 175,' AD-A253 089, p289-296.