液晶的聚合物取向机理的研究

Mechanism of Polymer Alignment of Liquid Crystal Materials

关于液晶在摩擦聚合物表面排列取向的机理,有两种基本的解释:一是认为摩擦产生的沟痕起着重要作用,根据自由能最小原理,液晶分子沿着摩擦方向排列。另一种理论认为,摩擦影响聚合物膜的链取向,再通过类似晶体外延生长的方式影响液晶分子的排列。我们在实验中观察了液晶分子在经过二次摩擦的聚合物膜表面和聚碳酸脂延迟膜表面的排列,进一步证实了晶体外延式取向的理论。

Groves or scratches effect and Epitaxial effect are two basic theory about the mach-nism of alignment of liquid crystal materials on the rubbed polymer surface. After observing the orientation of liquid crystal molecules on twice rubbed polymer surfaces and on the ratardation film, we confirmed that the epitaxial effect takes an important role in the rubbing polymer case.