期刊
REACTIVE & FUNCTIONAL POLYMERS
卷 73, 期 9, 页码 1223-1230出版社
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2013.06.005
关键词
Polybenzoxazine; Phenolic resin; Liquid-crystalline
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan
In this work, we describe a process to synthesize novel liquid-crystalline (LC) benzoxazines from a LC phenol that contains biphenyl, ester and azomethine groups in the mesogenic moiety, various alkyl amines and formaldehyde. The LC behavior of the biphenyl-containing benzoxazines was investigated by differential scanning calorimetry and polarized optical microscopy and compared with analogous phenyl-containing LC benzoxazines containing phenyl, ester and azomethine groups in the mesogenic moiety. While the LC benzoxazines containing the phenyl groups only exhibited a nematic phase upon heating, the LC benzoxazines containing biphenyl groups exhibited a smectic phase as well as a nematic phase. Additionally, the LC-isotropic transition temperatures were over 100 degrees C higher than that for the phenyl-containing LC benzoxazines. A film obtained by curing the biphenyl-containing LC benzoxazine at 180 degrees C for 1 h exhibited birefringence. Finally, the thermal diffusivity of the cured LC benzoxazines was also investigated. (C) 2013 Elsevier Ltd. All rights reserved.
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