Synthesis, Characterization and Surface Properties of BPDA-MDA Polyimide

Abstract

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

Keywords:

• contact angle
• critical surface tension
• polyimide
• quantitative imaging analysis
• solid surface tension

Acknowledgments

This research was supported by the Daegu University Research Grand, 2005.