プラズマ処理による無極性プラスチックの表面処理 第二報

抄録

Polypropylene, non-polar polyolefin, has little wettability (30dyn/cm), and so polypropylene can't be printed or adhered by ordinary methods, Wettability had been given to a polypropylene sheet by treatment with argon-oxygen plasma (72dyn/cm). The wettabilyty, however, notably decreased after more than one month (48dyn/cm, nearly the same value by treatment of argon plasma); the reason was thought that the radical, involving oxygen and being formed on the surface, transformed to the inside of the sheet, but the smoothness of the surface was a little rough than virgin polypropylene. Finally, wettabilyty lasted for a long time in graft copolymers which were made by addition of various vinyl monomers-propylene oxide, glycidol, 2-hydroxyethyl methacrylate, vinyl acetate—to the sheet previously treated with argon-oxygen plasma (72dyn/cm, and 62dyn/cm after one month); the reason was thought that the long graft chains could not be transfered to the inside of the sheet.