Morphology Control of Poly(p-phenylene pyromelliteimide) by Means of Self-Assembling Polymerization
Morphology Control of Poly(p-phenylene pyromelliteimide) by Means of Self-Assembling Polymerization
复制标题
自组装聚合法控制聚对亚苯基均苯四酰亚胺的形貌
DOI：
10.1021/ma0346761
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发表时间：
2003
期刊：
影响因子：
5.5
通讯作者：
Y. Yamashita
中科院分区：
文献类型：
--
作者：
K. Kimura;Jin Zhuang;Kanji Wakabayashi;Y. Yamashita
介绍。聚对亚苯基均苯四酰亚胺（PPPI）因其优异的性能，尤其是超过 500 GPa 的最高模量而受到广泛关注1-3。 4 然而，PPPI 既不具有溶解性，也不具有熔融性，并且刚性结构带来的难处理性使其无法通过常规技术进行加工。 PPPI通常通过两步程序制备，包括可溶性聚酰胺酸前体的合成和随后的酰亚胺化。 5, 6 聚酰胺酸前驱体的取向困难和酰亚胺化过程中的快速结晶阻碍了PPPI形貌的控制。我们一直在研究溶液聚合过程中刚性聚合物的形貌控制，并通过不良溶剂聚合成功制备了芳香族聚酯7-13和聚硫酯14的晶须和微球。它们是通过低聚物的相分离形成的，包括结晶和液-液相。这些研究表明，通过反应诱导低聚物结晶的自组装聚合是难处理聚合物形态控制的一种有价值的方法。
Introduction. Poly (p-phenylene pyromelliteimide)(PPPI) has been receiving much attention1-3 because of the predicted outstanding properties, especially the highest modulus over 500 GPa. 4 However, PPPI exhibits neither solubility nor meltability, and the intractability derived from the rigid structure makes it inaccessible for processing by conventional techniques. PPPI has been usually prepared by a two-step procedure including the synthesis of a soluble poly (amic acid) precursor and the following imidization. 5, 6 The difficulty of the orientation of poly (amic acid) precursor and the rapid crystallization during imidization prevent to control the morphology of PPPI.We have been studying the morphology control of rigid polymers during solution polymerization and successfully prepared the whiskers and the microspheres of aromatic polyesters7-13 and polythioester14 by the polymerization in poor solvents. They are formed by the phase separation of oligomers including crystallization and liquid-liquid phase. These studies reveal that the self-assembling polymerization by means of the reaction-induced crystallization of oligomers is a valuable method for the morphology control of intractable polymers.