Accession Number:

ADP007482

Title:

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

Descriptive Note:

Corporate Author:

LEEDS UNIV (UNITED KINGDOM) DEPT OF PHYSICS

Personal Author(s):

• Carr, Paul L.
• Daviess, Geoff R.
• Ward, Ian M.

Report Date:

1991-02-01

Pagination or Media Count:

8.0

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