Synthesis and polymerization behavior of novel liquid-crystalline benzoxazines

被引：21
|
作者：
Kawauchi, Takehiro [1 ]
Murai, Yuta [1 ]
Hashimoto, Kazuhiro [1 ]
Ito, Masayoshi [1 ]
Sakajiri, Koichi [2 ]
Takeichi, Tsutomu [1 ]
机构：
[1] Toyohashi Univ Technol, Dept Environm & Life Sci, Toyohashi, Aichi 4418580, Japan
[2] Gifu Univ, Dept Chem, Fac Engn, Gifu 5011193, Japan
来源：
POLYMER | 2011年 / 52卷 / 10期
关键词：
Polybenzoxazine; Phenolic resin; Liquid-crystalline; MECHANICAL-PROPERTIES; NETWORK STRUCTURE; POLYBENZOXAZINES;
D O I：
10.1016/j.polymer.2011.03.042
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Novel liquid-crystalline (LC) benzoxazines were synthesized by using 4(4'-heptoxybenzoyloxy)benzylidene-4 ''-aminophenol, various alkylamines, and formalin in chloroform under reflux. Polarized optical microscopy (POM) and differential scanning calorimetry (DSC) were used to analyze the LC behavior of the synthesized benzoxazines. The novel benzoxazines showed nematic and smectic phases upon cooling cycle from the isotropic liquids. The LC benzoxazines also showed a nematic phase upon heating cycle, indicating that the novel benzoxazines are enantiotropic liquid crystals. The ring-opening polymerization behavior of the LC benzoxazines was investigated by DSC and IR analyses. POM observations showed that a polybenzoxazine film, prepared by thermally curing the LC benzoxazine up to 160 degrees C for 1 h, exhibited birefringence at room temperature. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2150 / 2156
页数：7
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