Synthesis of thermotropic polybenzoxazole using 3-amino-4-hydroxybenzoic acid
Synthesis of thermotropic polybenzoxazole using 3-amino-4-hydroxybenzoic acid
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DOI：
10.1007/s10965-017-1362-9
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发表时间：
2017-11-15
影响因子：
2.8
通讯作者：
Kaneko, Tatsuo
中科院分区：
文献类型：
--
作者：
Ali, Mohammad Asif;Shimosegawa, Hiroshi;Kaneko, Tatsuo
以3-氨基-4-羟基苯甲酸为单体，与一系列脂肪族二胺通过缩聚反应合成了生物基聚苯并恶唑（PBO）。所得生物基PBO具有5.70-7.20 X 10（4）g/mol的高重均分子量，并且显示出T-10值超过400 ° C和T-g值超过170 ° C的耐湿热性，其高于常规生物基聚合物聚酰胺11（约60 ° C）或聚（乳酸）（56 ° C）的那些。特别是生物基PBO的酰肼基团通过在330 ℃下退火20 min而环化以形成二唑环。所得PBO显示液晶（LC）行为以在熔融状态下纺成纤维。与传统聚合物聚酰胺11和聚乳酸（PLA）相比，所得PBO纤维显示出高的杨氏模量和机械强度值。
Bio-based polybenzoxazoles (PBOs) are prepared by polycondensation of diacid monomer derived from 3-amino-4-hydroxybenzoic acid with a series of aliphatic diamines. Resulting bio-based PBOs have high weight average molecular weight ranging 5.70-7.20 x 10(4) g/mol and show ultrahigh thermal resistance with T-10 values over 400 degrees C and T-g values over 170 degrees C, which are higher than those of conventional bio-based polymers, polyamides 11 (around 60 degrees C) or poly(lactic acid) (56 degrees C). Especially hydrazide group of the bio-based PBO were cyclized to form diazole ring by annealing at 330 degrees C for 20 min. The resultant PBO show liquid crystalline (LC) behavior to spin fiber in a melting state. The resultant PBO fibers showed high values of Young's modulus and mechanical strength as compared with conventional polymers polyamide 11 and poly(lactic acid) (PLA).