Control of the anchoring behavior of polymer-dispersed liquid crystals: effect of branching in the side chains of polyacrylates.
Control of the anchoring behavior of polymer-dispersed liquid crystals: effect of branching in the side chains of polyacrylates.
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聚合物分散液晶锚定行为的控制：聚丙烯酸酯侧链支化的影响。
DOI：
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发表时间：
2002
影响因子：
15
通讯作者：
M. Srinivasarao
中科院分区：
文献类型：
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作者：
Jian Zhou;D. Collard;J. Park;M. Srinivasarao
本文报道了聚合物/疏水流体复合材料中的温度驱动的锚定转变，该转变远离本体向列相-各向同性转变温度。一系列的聚（甲基庚基丙烯酸酯）进行了研究，以探讨的微妙影响的侧链结构的聚合物上的锚定控制。由TL 205和丙烯酸1-甲基庚酯制成的聚合物分散的液晶膜在所研究的温度范围内仅显示平面锚定，而由TL 205和其他丙烯酸甲基庚酯或丙烯酸正庚酯中的每一种制成的膜在70至78摄氏度之间的温度下显示垂直向平面锚定转变。提出了一种界面模型，其中侧链的不同构象被认为是所观察到的锚定行为的显着差异的原因。
A temperature-driven anchoring transition in a polymer/nematic fluid composite that is far from the bulk nematic-isotropic transition temperature is reported. A series of poly(methylheptyl acrylates) were studied to probe the subtle effects of the side chain structure of the polymer on control of the anchoring. A polymer-dispersed liquid crystal film made from TL205 and 1-methylheptyl acrylate shows only planar anchoring over the temperature range studied, while the films made from TL205 and each of the other methylheptyl acrylates or n-heptyl acrylate show the homeotropic-to-planar anchoring transition at temperatures between 70 and 78 degrees C. An interfacial model is proposed in which the different conformation of the side chains is suggested as the cause for the dramatic difference in the observed anchoring behavior.