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Titolo:
SYNTHESIS AND CHARACTERIZATION OF POLYOXETANES CONTAINING 4-CYANOBIPHENYL-BASED SIDE-GROUPS FOR NONLINEAR-OPTICAL APPLICATIONS .2. SYNTHESIS, CHARACTERIZATION AND POLYMERIZATION OF 3,3-BIS(4-CYANO-4'-BIPHENYLYLOXYMETHYL) OXETANE
Autore:
GUICHARD B; POIRIER V; NOEL C; REYX D; LEBORGNE A; LEBLANC M; LARGE M; KAJZAR F;
Indirizzi:
ECOLE SUPER PHYS & CHIM IND VILLE PARIS,URA CNRS 278,LAB PHYSICOCHIM STRUCT & MACROMOL F-75231 PARIS 05 FRANCE ECOLE SUPER PHYS & CHIM IND VILLE PARIS,URA CNRS 278,LAB PHYSICOCHIM STRUCT & MACROMOL F-75231 PARIS 05 FRANCE UNIV MAINE,LAB CHIM & PHYSICOCHIM MACROMOL,URA CNRS 509 F-72017 LE MANS FRANCE UNIV PARIS 06,URA CNRS 24,LAB CHIM MACROMOL F-75005 PARIS FRANCE UNIV MAINE,LAB FLUORURES,URA CNRS 449 F-72017 LE MANS FRANCE CENS,CEA,DTA,LETI,DEIN,SPE,LAB PHYS ELECT & MAT F-91191 GIF SUR YVETTE FRANCE
Titolo Testata:
Macromolecular chemistry and physics
fascicolo: 11, volume: 197, anno: 1996,
pagine: 3631 - 3656
SICI:
1022-1352(1996)197:11<3631:SACOPC>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIQUID-CRYSTALLINE POLYMERS; MESOGENIC GROUP; CHAIN; BEHAVIOR; POLYETHERS; 2ND;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
B. Guichard et al., "SYNTHESIS AND CHARACTERIZATION OF POLYOXETANES CONTAINING 4-CYANOBIPHENYL-BASED SIDE-GROUPS FOR NONLINEAR-OPTICAL APPLICATIONS .2. SYNTHESIS, CHARACTERIZATION AND POLYMERIZATION OF 3,3-BIS(4-CYANO-4'-BIPHENYLYLOXYMETHYL) OXETANE", Macromolecular chemistry and physics, 197(11), 1996, pp. 3631-3656

Abstract

3,3-Bis(4-cyano-4'-biphenylyloxymethyl)oxetane was prepared by reaction of 3,3-bis(chloromethyl)oxetane with the sodium salt of 4-cyano-4'-hydroxybiphenyl. With highly purified dichloromethane, single crystalscould be prepared. The X-ray patterns could be indexed in terms of a monoclinic cell a = 13,87 Angstrom, b = 14,74 Angstrom, c = 13,91 Angstrom and beta = 118,68 degrees. Some experiments were carried out to determine the cationic polymerization behavior of this oxetane. The initiating system BF3 . Et(2)O/dichloromethane was used and it was shown that unusually high initiator concentrations were necessary to observepolymerization. By means of steric exclusion chromatography and NMR spectroscopy, the formation of cyclic oligomers was evidenced. Upon heating, all the polymers showed a nematic phase. Some preliminary Coronapoling experiments were performed and the second harmonic generation coefficients d(31) and d(33) were measured. It was shown that one can gain in net polar ordering by starting with a liquid crystalline system. The ratio d(33)/d(31) was found to be much larger than 3 in agreement with the molecular statistical models for electric field poling of liquid crystals.

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Documento generato il 26/11/20 alle ore 19:56:16