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Titolo:
SYNTHESIS AND PHASE-BEHAVIOR OF 1-MESOGEN IC ROUP-1,3,3,5,5,7,7-HEPTAMETHYL-CYCLOTETRASILOXANES
Autore:
ZHANG XL; LUO ZH; ZHUO RX;
Indirizzi:
WUHAN UNIV,DEPT CHEM WUHAN 430072 PEOPLES R CHINA
Titolo Testata:
Gaodeng xuexiao huaxue xuebao
fascicolo: 9, volume: 16, anno: 1995,
pagine: 1380 - 1384
SICI:
0251-0790(1995)16:9<1380:SAPO1I>2.0.ZU;2-I
Fonte:
ISI
Lingua:
CHI
Soggetto:
SILOXANES; POLYMERS;
Keywords:
SILOXANE; LIQUID CRYSTAL; SYNTHESIS; PHASE BEHAVIOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
X.L. Zhang et al., "SYNTHESIS AND PHASE-BEHAVIOR OF 1-MESOGEN IC ROUP-1,3,3,5,5,7,7-HEPTAMETHYL-CYCLOTETRASILOXANES", Gaodeng xuexiao huaxue xuebao, 16(9), 1995, pp. 1380-1384

Abstract

Six new cyclotetrasiloxanes (1-6) with only one mesogenic group in the molecule were obtained by reacting two organocyclotetrasiloxanes with six mesogenic compounds (M(1)-M(6)) respectively. Their chemical structures were confirmed by IR, H-1 NMR and elemental analysis, Their phase behavior was also investigated by using differential scanning calorimetry and polarizing microscopy, The results show that eight compounds (M(3)-M(6), 3-6) exhibit liquid crystalline phase transition. The experimental results also prove that the existence of the siloxane cyclic structure can not only enlarge the temperature range of mesomorphicstate in the LC compound, but also be favorable for the LC molecular orientation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 08:04:08