SYNTHESIS AND CHARACTERIZATION OF POLYOXETANES CONTAINING 4-CYANOBIPHENYL-BASED SIDE-GROUPS FOR NONLINEAR-OPTICAL APPLICATIONS .1. CHEMICALMODIFICATION OF POLY[3,3-BIS(CHLOROMETHYL)OXETANE] WITH SODIUM 4-CYANO-4'-BIPHENYL OXIDE

Citation
B. Guichard et al., SYNTHESIS AND CHARACTERIZATION OF POLYOXETANES CONTAINING 4-CYANOBIPHENYL-BASED SIDE-GROUPS FOR NONLINEAR-OPTICAL APPLICATIONS .1. CHEMICALMODIFICATION OF POLY[3,3-BIS(CHLOROMETHYL)OXETANE] WITH SODIUM 4-CYANO-4'-BIPHENYL OXIDE, Macromolecular chemistry and physics, 197(7), 1996, pp. 2185-2199
Citations number
22
Categorie Soggetti
Polymer Sciences
ISSN journal
10221352
Volume
197
Issue
7
Year of publication
1996
Pages
2185 - 2199
Database
ISI
SICI code
1022-1352(1996)197:7<2185:SACOPC>2.0.ZU;2-E
Abstract
Two copolyethers were prepared by chemical modification of poly[3,3-bi s(chloromethyl)oxetane] with sodium 4-cyano-4'-biphenyl oxide, employi ng the concept of having the cyanobiphenyl species serve concomitantly as both the nonlinear optical chromophore and the mesogenic moiety in the polymer. Their thermal behavior was established by means of DSC a nd optical microscopy. Some preliminary Corona poling experiments were performed, and the second harmonic generation coefficients d(31) and d(33) were measured by Maker fringe analysis. The results showed that liquid crystallinity enhances field-induced polar ordering. The ratio d(33)/d(31) was found to be much larger than 3, in agreement with the theoretical models for electric field poling of liquid crystalline pol ymers where hyperpolarizable chromophores are attached as side groups to a polymer backbone.