Supramolecular Assemblies of a Semirigid Polyanion in Aqueous Solutions

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• 作者：Zi Liang Wu ; Md. Arifuzzaman ; Takayuki Kurokawa ; Khoa Le ; Jian Hu ; Tao Lin Sun ; Hidemitsu Furukawa ; Hiroyasu Masunaga ; Jian Ping Gong
• 刊名：Macromolecules
• 出版年：2013
• 出版时间：May 14, 2013
• 年：2013
• 卷：46
• 期：9
• 页码：3581-3586
• 全文大小：397K
• 年卷期：v.46,no.9(May 14, 2013)
• ISSN：1520-5835

文摘

In this article, we report the supramolecular assemblies of a semirigid polyelectrolyte, poly(2,2鈥?disulfonyl-4,4鈥?benzidine terephthalamide) (PBDT) in water. Cryo-TEM observation and SAXS measurement reveal that PBDT forms bundle-like structure even in very dilute concentration, C_P, of 0.02 wt %. These bundle-like assemblies serve as new primary building blocks and self-assemble further as C_P increases, to form large associations with or without long-range orientation. When 2 wt % < C_P < 6 wt %, liquid鈥搇iquid phase separation occurs. Some of the supramolecular associations form bipolar liquid crystalline (LC) droplets via a typical nucleation and growth process. The droplets grow up by the coalescence of small ones and sediment under the gravity and coalesce to form a bottom nematic phase. When C_P 鈮?6 wt %, the solutions are in a uniform nematic phase. The existence of these preliminary supramolecular assemblies of PBDT in aqueous solutions should be crucial for the formation of nematic LC phase at a significantly low C_P, as well as the formation of macroscopic ordered structures in hydrogels via electrostatic interaction between PBDT and oppositely charge multivalent metallic ion or polycation.