Increased alignment of electronic polymers in liquid crystals via hydrogen bonding extension
Increased alignment of electronic polymers in liquid crystals via hydrogen bonding extension
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DOI：
10.1021/ja065662o
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发表时间：
2006-11-29
影响因子：
15
通讯作者：
Swager, Timothy M.
中科院分区：
文献类型：
--
作者：
Hoogboom, Johan;Swager, Timothy M.
增强型电光材料的关键是高各向异性材料的构建。向列型液晶能够控制聚（亚苯基乙炔）（PPE）的链构象和排列，产生具有链延伸平面构象的电子聚合物，以改善传输性能。在这里，我们表明，二向色性比，因此聚合物的取向，显着增加时，引入端封PPE与氢键基团的聚合物间的相互作用。这种增加的顺序可以通过引入竞争性单官能化氢键化合物而容易地关闭。聚合物之间氢键的形成导致凝胶和弹性体的形成，这可能是未来应用所关注的。
Crucial for the development of enhanced electrooptic materials is the construction of highly anisotropic materials. Nematic liquid crystals are able to control the chain conformation and alignment of poly(phenylene ethynylene)s (PPEs), producing electronic polymers with chain-extended planar conformations for improved transport properties. Here, we show that the dichroic ratio, and hence polymer alignment, increases dramatically when interpolymer interactions are introduced by end capping the PPE with hydrogen bonding groups. This increased order can be readily turned off by the introduction of a competing monofunctionalized hydrogen bonding compound. The formation of hydrogen bonds between the polymers results in the formation of gels and elastomers which may be of interest for future applications.