Synthesis and Phase Behavior of 1,3-bis-(Mesogenes)-1, 1, 3, 3-tetra Methyldisiloxanes

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (3): 471.

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Synthesis and Phase Behavior of 1,3-bis-(Mesogenes)-1, 1, 3, 3-tetra Methyldisiloxanes

ZHANG Xian-Liang, ZHANG Jian-Qiang, WANG Cheng-Rui, ZHUO Ren-Xi

Deparement of Chemistry, Wuhan University, Wuhan 430072

Received:1994-03-14 Revised:1994-08-24 Online:1995-03-24 Published:1995-03-24

Abstract

Abstract: Sixteen 1, 3-bis-(mesogens )-1, 1, 3, 3-tetramethyl disiloxanes ( I_a,bⅢ_a-g, Ⅲ_j,IV_a-f) were synthesized. Their chemical structures were confirmed by¹HNMR, IR, UV and elemental analysis. Their phase behaviors were also investigated by using differential scanning calorimeter(DSC) and polarizing microscope. The results show that twelve compounds exhibit the liquid crystalline (LC) plase transition temperatures except four cornpunds(Ⅱ_a.b,Ⅲ_d, IV_d). X-ray diffraction has been used to investigate the crystal structure of 1, 3-bis-(4-methylazobenzene-oxy-methyl)-1, 1, 3, 3-tetrametbyl disiloxane (Ⅱ_a). The influence ofchemical structures of these novel siloxane compounds on LC phase behaviors were discussed.

Key words: Liquid crystalline, Siloxane, Synthesis Phase behavior, Azobenzene

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ZHANG Xian-Liang, ZHANG Jian-Qiang, WANG Cheng-Rui, ZHUO Ren-Xi . Synthesis and Phase Behavior of 1,3-bis-(Mesogenes)-1, 1, 3, 3-tetra Methyldisiloxanes[J]. Chem. J. Chinese Universities, 1995, 16(3): 471.

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Synthesis and Phase Behavior of 1,3-bis-(Mesogenes)-1, 1, 3, 3-tetra Methyldisiloxanes

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