Lamellar to columnar mesophase evolution in a series of PAMAM liquid-crystalline codendrimers
Lamellar to columnar mesophase evolution in a series of PAMAM liquid-crystalline codendrimers
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一系列 PAMAM 液晶共树枝状聚合物中层状到柱状中间相的演化
DOI：
10.1021/ma030223k
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发表时间：
2003
期刊：
影响因子：
5.5
通讯作者：
J. Serrano
中科院分区：
文献类型：
--
作者：
J. Rueff;J. Barberá;B. Donnio;D. Guillon;M. Marcos;J. Serrano
本文报道了七种聚酰胺-胺（PAMAM）共树枝状大分子的合成、表征及液晶行为。这些化合物是通过接枝两种类型的终端promesogenic单位，携带一个或两个癸氧基链，在不同的比例到第三代的PAMAM树枝状聚合物。通过使用NMR光谱的原始解释确定前介晶单元的平均数。X射线衍射研究表明，这些化合物表现出层状和/或柱状中间相。介晶相的类型由存在于给定共树枝状聚合物中的每种前介晶单元的数目和温度决定。不同分子的超分子组织的演变被解释为一个功能的烷氧基链的数量存在于周围的树枝状的核心和相比，开发的模型的homodendrimers完全功能化的promesogenic单元与一个或两个癸氧基链。
The synthesis, chemical characterization and liquid crystalline behavior of a series of seven poly(amidoamine) (PAMAM) codendrimers are described. These compounds were obtained by grafting two types of terminal promesogenic units, that carry either one or two decyloxy chains, in various proportions onto the third generation of PAMAM dendrimer. The average number of promesogenic units was determined by using an original interpretation of the NMR spectra. X-ray diffraction studies show that these compounds exhibit lamellar and/or columnar mesophases. The type of mesophase is determined by the number of each kind of promesogenic units present in a given codendrimer and by the temperature. The evolution of the supramolecular organization of the different molecules is explained as a function of the number of alkoxy chains present around the dendritic core and compared to the models developed for the homodendrimers totally functionalized by promesogenic units with either one or two decyloxy chains.