Synthesis and Phase Behavior of 1-Mesogenic Group 1,3,3,5,5,7,7-Heptamethyl-Cyclotetrasiloxanes

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (9): 1380.

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Synthesis and Phase Behavior of 1-Mesogenic Group 1,3,3,5,5,7,7-Heptamethyl-Cyclotetrasiloxanes

ZHANG Xian-Liang, LUO Zhao-Hui, ZHUO Ren-Xi

Department of Chemistry, Wuhan University, Wuhan, 430072

Received:1994-12-01 Revised:1995-04-12 Online:1995-09-24 Published:1995-09-24

Abstract

Abstract: Six new cyclotetrasiloxanes(1-6) with only one mesogenic group in the molecule were obtained by reacting two organocyclotetrasiloxanes with six mesogenic compounds (M₁-M₆) respectively. Their chemical structures were confirmed by IR, ¹HNMR and elemen tal analysis. Their phase behavior was also investigated by using differential scanning calorimetry and polarizing microscopy, The results show that eight compounds(M₃-M₆, 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 mesomorphic state in the LCcompound, but also be favorable for the LCmolecular orientation.

Key words: Siloxane, Liquid crystal, Synthesis, Phase behavior

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ZHANG Xian-Liang, LUO Zhao-Hui, ZHUO Ren-Xi. Synthesis and Phase Behavior of 1-Mesogenic Group 1,3,3,5,5,7,7-Heptamethyl-Cyclotetrasiloxanes[J]. Chem. J. Chinese Universities, 1995, 16(9): 1380.

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Synthesis and Phase Behavior of 1-Mesogenic Group 1,3,3,5,5,7,7-Heptamethyl-Cyclotetrasiloxanes

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