Self-assembled structures of a semi-rigid polyanion in aqueous solutions and hydrogels

作     者：SUN TaoLin WU ZiLiang GONG JianPing 

作者机构：Division of Biological Sciences Graduate School of Science Hokkaido University Sapporo 060-0810 Japan Faculty of Advanced Life Science Graduate School of Science Hokkaido University Sapporo 060-0810 Japan 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2012年第55卷第5期

页      面：735-742页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0824[工学-船舶与海洋工程] 082401[工学-船舶与海洋结构物设计制造] 0702[理学-物理学] 

基　　金：supported by a Grant-in-Aid for the Specially Promoted Research (18002002) from the Ministry of Education  Science  Sports and Culture of Japan 

主　　题：hydrogels self-assembl polyelectrolyte semi-rigid polyion complex 

摘      要：Poly(2,2 -disulfonyl-4,4 -benzidine terephthalamide) (PBDT), a kind of liquid-crystalline (LC) molecule, has high molecular weight, negative charge and a semi-rigid structure. The aqueous solution of PBDT shows nematic liquid crystalline state above a critical PBDT concentration, CLC*, of 2 wt%-3wt%. Different from the flexible polyelectrolyte, PBDT shows a variety of self-assembling structures in aqueous solution with and without salt due to the semi-rigid nature and highly charged property. In addition, the hydrogels with ordered structure are developed by polymerizing a cationic monomer N-[3-(N,N-dimethylamino) propyl] acrylamide methyl chloride quarternary (DMAPAA-Q) in the presence of a small amount of PBDT below the CLC*. During the polymerization of cationic monomer, the polycations form a complex with semi-rigid PBDT through electrostatic interaction; these complexes self-assemble into ordered structures that are frozen in the hydrogel. Several different structures, including the anisotropic, dual network-like structure, and cylindrically symmetric structure, with various length scales from micrometer to millimeter, are observed. The hydrogels with ordered liquid crystalline assemblies and particular optical properties should promise applications in many fields, such as in bionics, tissue engineering, and mechano-optical sensors.