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Surface free energy and pretilt angle on rubbed polyimide surfaces

✍ Scribed by B. S. Ban; Y. B. Kim

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
164 KB
Volume
74
Category
Article
ISSN
0021-8995

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✦ Synopsis

To investigate surface free energy of rubbed polyimide surfaces as a function of the rubbing strength, we measured the contact angle of distilled water and methylene iodide on the polyimide surfaces. For this purpose, a main-chain-type and two side-chain-type polyimides were used. The dispersion force (β₯ d ) and the polar force (β₯ p ) of the rubbed polyimide surfaces was measured. The rubbing induced polarity on the polyimide surfaces. Also, polar forces contributed to form a pretilt angle of liquid crystals on the rubbed polyimide surfaces.

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