Abstract
BPDA (3,3′,4,4′-biphenyl tetracarboxylic dianhydride)-MDA (p,p′-methylene dianiline) polyimide was successfully synthesized. Critical surface tension γc and surface tension γs of BPDA-MDA polyimide film have been estimated by the contact angle method using our quantitative imaging system. The critical surface tensions γc were analyzed by a Zisman plot, a Young-Dupré-Good-Girifalco plot, and a log (1 + cos θ) vs log γL plot. The Zisman plot is essentially a downwardly convex curve with polar and hydrogen bonding liquids having γc < < γL. The calculated values of (a dispersion component), (a polar component), (a hydrogen bonding component), and γS are 32.13, 4.93, 0.02, and 37.08 mN·m−1, respectively.
Acknowledgments
This research was supported by the Daegu University Research Grand, 2005.