Title page for etd-0117108-235823


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URN etd-0117108-235823
Author Chih-hung Lu
Author's Email Address No Public.
Statistics This thesis had been viewed 5576 times. Download 3926 times.
Department Electro-Optical Engineering
Year 2007
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title The study of surface free energy and wettability of liquid crystal alignment layers
Date of Defense 2008-01-14
Page Count 104
Keyword
  • Rubbed polyimide
  • Surface Wettability
  • Surface anisotropy
  • Alignment layer
  • Surface free energy
  • Abstract In the present studies we investigated the effects of mechanical rubbing on the surface characteristics of polymer liquid crystal alignment layers. Contact angles of water droplets in contacted with the rubbed polyimide were measured using a surface tension meter, and the surface free energy of the polymer thin films were evaluated. We found that the contact angle of water and surface free energy on rubbed polyimide is anisotropic, and rubbing caused decrease in surface free energy and wettability of the polyimide surface. It was also seen that the contact angle hysteresis and the surface free energy measured in the direction parallel to the rubbing direction is smaller than that in the direction anti-parallel to the rubbing direction. We found that when the pile impression of the velvet fibers is 0.3 mm and the cumulative number of rub is 3 times, the contact angle hysteresis in direction parallel or anti-parallel to the rubbing direction will to be close.
    Be suitable choosing rubbing conditions, the SSFLCs without zigzag defects was produced. The pretilt angle and the response time of liquid crystal increased with the cumulative number.
    Advisory Committee
  • Tsung-Hsien Lin - chair
  • Mei-Ying Chang - co-chair
  • Wen-Yao Huang - co-chair
  • Wen-Jun Zheng - advisor
  • Files
  • etd-0117108-235823.pdf
  • indicate in-campus access immediately and off_campus access in a year
    Date of Submission 2008-01-17

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