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Titolo:
SYNTHESIS AND PHOTOINDUCED TRANSFORMATION OF HELICAL AROMATIC POLYAMIDES CONSISTING OF AXIALLY DISSYMMETRIC BIPHENYLENE JOINTS AND AZOBENZENE SEGMENTS IN THE BACKBONE
Autore:
KONDO F; KAKIMI S; KIMURA H; TAKEISHI M;
Indirizzi:
YAMAGATA UNIV,DEPT MAT SCI & ENGN YONEZAWA YAMAGATA 992 JAPAN YAMAGATA UNIV,DEPT MAT SCI & ENGN YONEZAWA YAMAGATA 992 JAPAN
Titolo Testata:
Polymer international
fascicolo: 4, volume: 46, anno: 1998,
pagine: 339 - 344
SICI:
0959-8103(1998)46:4<339:SAPTOH>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
SENSE-SELECTIVE POLYMERIZATION; ASYMMETRIC POLYMERIZATION; POLYISOCYANATES; COMPLEXES; ISOCYANIDES; 1,2-DIISOCYANOARENES; CONFORMATION; METHACRYLATE; POLYMERS;
Keywords:
POLYAMIDE; BIPHENYL; DISSYMMETRY; HELIX; AZOBENZENE; PHOTOISOMERIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
F. Kondo et al., "SYNTHESIS AND PHOTOINDUCED TRANSFORMATION OF HELICAL AROMATIC POLYAMIDES CONSISTING OF AXIALLY DISSYMMETRIC BIPHENYLENE JOINTS AND AZOBENZENE SEGMENTS IN THE BACKBONE", Polymer international, 46(4), 1998, pp. 339-344

Abstract

Wholly aromatic polyamides having a novel helical structure were prepared by the reaction of axially dissymmetric (R)- or (S)-6,6'-dimethylbiphenyl-2, 2'-dicarbonyl chloride with aromatic diamines, which are soluble in common solvents such as tetrahydrofuran and N,N-dimethylformamide. Photo-irradiation of a tetrahydrofuran solution of the polymer obtained with 4,4'-diaminoazobenzene induced a change of the helical conformation because of the trans-cis isomerization of the azobenzene units in the polymer chain. No change in the specific rotation of the polymer was observed on heating at 100 degrees C for 4 h, indicating thermal stability of its helical structure. CD spectra showed that the helical conformation was maintained in methanesulphonic acid. (C) 1998 SCI.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 12:24:47