Built-up synthesis of nanofiber networks of high-performance polymers

刚性棒状芳香族聚合物具有许多优异的性能。然而，由于它们的刚性棒结构，它们中的许多不表现出诸如溶解性和熔融性的可加工性，并且它们已经被放弃用作材料。我们研究了聚合过程中反应诱导的相分离，以克服高性能和低加工性之间的对立问题。成功地制备了聚酯、聚酰亚胺、聚苯并咪唑和聚醚酮等具有网络结构的聚合物。进一步得到了聚酯酰亚胺的螺旋带以及聚甲亚胺和聚咪唑吡咯酮的纳米纤维，这是一种理想的梯形聚合物。

Rigid-rod aromatic polymers are expected to possess many excellent properties. However, many of them do not exhibit processability such as solubility and fusibility because of their rigid-rod structure and they had been given up to use as materials. We examined the reaction-induced phase separation during polymerization in order to overcome the antagonistic problem between the high performance and the less processability. The network structures of polyester, polyimides, polybenzimidazoles and poly(ether ketone) were successfully prepared. And further, helical ribbon of poly(ester-imide) and nanofibers of polyazomethine and polyimidazopyrrolone which is a perfect ladder polymer were also obtained.