Dielectric, TSC and Electromechanical Measurements on Some Prospective NLO Polymers,
LEEDS UNIV (UNITED KINGDOM) DEPT OF PHYSICS
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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.