Anisotropy in Surface Free Energy of Rubbed Polyimide Thin Films
The application of mechanical rubbing to polyimide breaks the symmetry on the polymer surface and promotes a template for liquid crystal alignment. Macroscopic observation of the surface symmetry of the rubbed polyimide is made by means of the measurement of the free energy in the surface region. It is found that the free energy of the rubbed polyimide thin films varied with the azimuthal angle against the rubbing direction. The increase of rubbing strength results in the decrease in the surface free energy of the polymer thin films. Mechanical rubbing also modifies the wettability of the polyimide surface.
Rubbed Polyimide Surface Free Energy Surface Anisotropy Surface Wettability
W. Zheng C. Lu Y. Yeh Y. Tien
Institute of Electro-optical Engineering, National Sun Yat-Sen University,70 Lien-hai Road, Kaohsiung 804, Taiwan, China
国际会议
上海
英文
1733-1737
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）