Fabrication of folding polymeric thin films with hydrophilic properties
Resumo
Polydimethylsiloxane (PDMS) sheets were used as a mold for the generation of low cost polymeric thin films. Poly(ethylene glycol) diacrylate average Mn 575, Poly(ethylene glycol) diacrylate average Mn 250 and Phenylbis (2, 4, 6-trimethylbenzoyl) phosphine oxide were used to create hydrophilic and hydrophobic thin films. The thickness of the films was highly dependent on the amount of the polymeric mixture and the pressure between the PDMS sheets. The hydrophobicity of the films was measured by observing the contact angle of a water drop on the film, as well as the degrees of folding when the film absorbed humidity. The films produced with Poly(ethylene glycol) diacrylate average Mn 575 were found to be hydrophobic, while the films produced with Poly(ethylene glycol) diacrylate average Mn 250 were found to be hydrophilic. Hydrophobic films fold when exposed to a drop of water on their surface. The time and the angle of folding were directly dependent on the thickness of the film. A relation between the relative mass of the thin film and the angle of folding was found.
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