Surface restructuring of polymers |
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Authors: | Sang Hwan Lee Eli Ruckenstein |
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Institution: | 1. LIBPhys - Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação, Portugal;2. Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;3. Faculdade de Medicina Dentária da Universidade de Lisboa, 1649-003 Lisboa, Portugal |
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Abstract: | Time-dependent contact angle measurements are employed to follow the dynamics of surface modifications of various polymeric surfaces of different hydrophilicities. The equilibration of a hydrophilic polymer in a strong polar environment (such as water) induces an increase in the polarity of the surface; the subsequent exposure of the restructured solid to a nonpolar environment decreases the polarity of the surface. The dynamics of these processes depends on the history of the specimen. Various phenomena, such as surface restructuring by the reorientation of the buried polar or nonpolar moieties, water penetration into the polymer, and the reorganization of water in the neighborhood of the surface, are suggested to be responsible for the time evolution of the dynamic contact angles. |
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