Wettability Alteration of Polymer Surfaces Produced by Scraping

摘要

In this paper, we present a simple, yet novel, method, utilizing scraping to obtain continuous rough mi-crostructures over large areas, leading to a tunable wettability conversion from hydrophilicity to superhy-drophobicity on polymer surfaces. A series of polymers ranging from hydrophobic to hydrophilic were used, and we found that the wettability of these polymer surfaces could be modified by the scraping process, irrespective of their hydrophobicity or hydrophilicity. More importantly, those polymers with contact angle ranging from 65° to 90° on their smooth surfaces also exhibit enhanced hydrophobicity after scraping. Ova-results indicate that 65° is the critical value which is more suitable to define hydrophobicity and hydrophilicity for polymer materials.