Control of anchoring of nematic fluids at polymer surfaces created by in situ photopolymerization.
Control of anchoring of nematic fluids at polymer surfaces created by in situ photopolymerization.
复制标题
控制原位光聚合产生的聚合物表面向列流体的锚定。
DOI：
10.1021/jp040635a
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Srinivasarao
中科院分区：
文献类型：
--
作者：
Jian Zhou;D. Collard;J. Park;M. Srinivasarao
丙烯酸烷基酯单体在包封流体存在下的原位光聚合提供液晶液滴的蜂窝状基质，其中包封聚合物的化学结构对液晶分子的排列（锚定）施加控制。控制是通过烷基侧链的变化，并通过两个不同的单官能丙烯酸酯的共聚。例如，在一系列聚（甲基庚基丙烯酸酯）中，1-甲基庚基类似物在所研究的温度范围内更倾向于平面锚定的一种聚合物（TL 205）。然而，其他甲基庚基侧链的聚合物显示出与正庚基类似物类似的垂直面至平面锚定热转变温度。两种具有相反取向液晶倾向的单官能丙烯酸酯的共聚导致在宽温度范围内锚定行为的可调谐性。我们观察到的广泛的锚定过渡提供了一种实现高度倾斜锚定的方法。
In situ photopolymerization of alkyl acrylate monomers in the presence of a nematic fluid provides a cellular matrix of liquid crystalline droplets in which the chemical structure of the encapsulating polymer exerts control over the alignment (anchoring) of the liquid crystalline molecules. Control is obtained by variation of the alkyl side chains and through copolymerization of two dissimilar monofunctional acrylates. For example, among a series of poly(methylheptyl acrylate)s, the 1-methylheptyl analogue prefers planar anchoring of a nematic (TL205) over the temperature range studied. However, the polymers of other methylheptyl side chains display a homeotropic-to-planar anchoring thermal transition temperature similar to that of the n-heptyl analogue. Copolymerization of two monofunctional acrylates with opposing tendencies of aligning liquid crystal leads to tunability of anchoring behavior over a wide temperature range. The broad anchoring transitions we observed provide a way of achieving highly tilted anchoring.