SYNTHESIS OF VERY HIGHLY ORDERED LIQUID-CRYSTALLINE PHASES BY COMPLEX-FORMATION OF POLYACRYLIC-ACID WITH CATIONIC SURFACTANTS
SYNTHESIS OF VERY HIGHLY ORDERED LIQUID-CRYSTALLINE PHASES BY COMPLEX-FORMATION OF POLYACRYLIC-ACID WITH CATIONIC SURFACTANTS
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DOI：
10.1002/anie.199418691
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发表时间：
1994-09-30
期刊：
影响因子：
--
通讯作者：
CONRAD, J
中科院分区：
文献类型：
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作者：
ANTONIETTI, M;CONRAD, J
离子表面活性剂和带相反电荷的聚电解质自发地形成从水溶液中沉淀的加成络合物。邻基效应，开始在非常低的浓度下起作用，对于这种复合物的形成是重要的。观察到高度合作的拉链机制，并且配合物的化学计量（相对于电荷）通常为I：1。然而，这种络合物在非水溶剂和固态中的性质只是最近才被研究。聚（n-烷基三甲基铵苯乙烯磺酸盐）系统显示出高度有序的层状结构，这显然是采用不同的相修饰时，烷基的链长是不同的。[41形成这些相的驱动力是离子主链和烷基侧链之间的不相容性，也被称为系统的互变性，我们现在提出一个系统，其中在聚丙烯酸主链上发生复合物形成，并且其中空间效应防止n-烷基链的平行取向和所得层状结构的形成。这是第一次，在这种聚合物体系中可以实现更多样化的相结构。
Ionic surfactants and oppositely charged polyelectrolytes spontaneously form addition complexes that precipitate from aqueous solution. Neighboring group effects, which begin to operate at very low concentrations, are important for the formation of such complexes. A highly cooperative zipper mechanism is observed, and the stoichiometry of the complexes (with respect to charge) is usually I: 1.[’-31 The properties of such complexes in nonaqueous solvents and in the solid state have, however, only recently been investigated. The poly (n-alkyltrimethylammonium styrene sulfonate) system shows highly ordered lamellar structures, which clearly adopts different phase modifications when the chain length of the alkyl groups is varied.[41 The driving force for the formation of these phases is the incompatibility between the ionic backbone and alkyl side chains, otherwise known as the amphotropy of the system.We now propose a system in which complex formation occurs at the polyacrylic acid backbone and in which steric effects prevent a parallel orientation of the n-alkyl chains and formation of the resulting layered structures. For the first time, yet more diverse phase structures can be achieved in this polymer system.