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Alignment layers with variable anchoring strengths from Polyvinyl Alcohol

机译:聚乙烯醇具有不同锚固强度的对准层

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摘要

In the study of polyvinyl alcohol (PVA) alignment layers for liquid crystal devices, we found that the anchoring strength can be greatly varied by changing the alignment film thickness. Both the polar and azimuthal anchoring strengths increased with increasing film thickness; however, they had different film thickness dependences. It was also noticed that the quartic term in the expansion of the Rapini-Papoular anchoring energy was important for describing the polar anchoring. In the experiment, solid PVA was dissolved in a thinner and spin-coated on glass substrates to create alignment layers. The substrates were assembled to make electrically-controlled birefringence liquid crystal cells. The polar anchoring strength of the alignment layer was measured using the high field method and the azimuthal anchoring strength using the twist angle method.
机译:在用于液晶装置的聚乙烯醇(PVA)取向层的研究中,我们发现,通过改变取向膜的厚度可以大大改变锚固强度。极性和方位锚固强度均随膜厚度的增加而增加;然而,它们具有不同的膜厚度依赖性。还注意到,Rapini-Papoular锚定能量扩展中的四次项对于描述极性锚定很重要。在实验中,将固态PVA溶解在稀释剂中,然后旋涂在玻璃基板上以形成取向层。组装基板以制造电控双折射液晶盒。使用高场法测量取向层的极性锚固强度,并使用扭转角法测量方位锚固强度。

著录项

  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.1-7|共7页
  • 作者单位

    Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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