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Surface free energy and pretilt angle on rubbed polyimide surfaces
Author(s) -
Ban B. S.,
Kim Y. B.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19991010)74:2<267::aid-app5>3.0.co;2-#
Subject(s) - polyimide , materials science , composite material , surface energy , surface (topology) , energy (signal processing) , layer (electronics) , physics , geometry , mathematics , quantum mechanics
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 (γ d ) and the polar force (γ 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. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 267–271, 1999