The characterization of polymer-water interfaces by contact angle measurement is performed using water-immiscible liquids. It gives the dispersive and the nondispersive components of surface tension as a function of functional group of copolymer hydrogels. Using the method of Rusanov, the contact-angle-induced deformation of the three-phase region in our systems was examined. The systems used were poly(2-hydroxyethyl methacrylate)(HEMA) and related copolymers.
Contact angle measurements on polymer hydrogels were performed at various temperatures. and we obtained the dispersive and the nondispersive components of the surface tension of polymer hydrogel at each temperature. Utilizing the temperature dependence values, we obtained the surface entropies of polymer hydrogels. The systems used were isotactic and syndiotactic poly(HEMA) and related copolymers. The contact angles were also measured by using droplets of water-immiscible liquids under conditions in which the polymer hydrogel was fully hydrated.
Finally, we performed a series of contact angle measurement on polymer-water interface at various pH conditions on polymer-water interface at various pH conditions of water. The data were analyzed and we obtained the pH dependence of the dispersive and nondispersive components of surface tension. The polymer hydrogels used were three copolymers containing HEMA monomer.
접촉각 측정에 의한 고분자-물의 계면에서의 표면분석을 시행하였다. 이 실험을 통하여 고분자 히드로겔의 표면 장력을 측정하였다.
루사노브(Rusanov)의 이론을 이용하여 변형성 고분자 히드로겔에서의 접촉각 측정을 하였는데, 이 실험을 통하여 친수성 고분자 히드로겔에서의 접촉각 측정은 보정이 필요하다는 것을 알았다.
여러 온도에서의 접촉각 측정을 수행하였던 이 실험을 통하여 온도변화에 따라 표면성질이 변한다는 것을 알았다.
물상(Water-phase)의 pH를 변화함에 따라 표면성질의 변화를 측정하였는데 아미노 (Amino)기를 포함한 고분자 히드로겔은 질소의비공유 전자쌍 때문에 pH의 변화에 따라 변화가 된다는 것을 알았다.
