Behavior of Contact Angle on Glass Plates Coated with Plasma- Polymerized Styrene, Allylamine and Acrylic Acid

Abstract

Styrene, allylamine and acrylic acid were polymerized by plasma polymerization technique under the ninth polymerization condition from 100W and 50Pa to 200W and 150Pa. We obtained the film-state polymer only under these conditions. The surfaces of plasma-polymerized (pp-) films from styrene, allylamine and acrylic acid were characterized by means of contact angle measurement. The values of contact angle of pp-styrene, pp-allylamine and pp-acrylic acid were widely scattered under the initial stage of nine polymerization conditions. However, these values after 40 days storage under vacuum condition always converged into 87° for pp-styrene, 67° for pp-allylamine and 28° for pp-acrylic acid, respectively. We assumed that this environmental adaptability of contact angle came from the turn over of polar functional groups between polymer surface and bulk.