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    Surface energy evaluation of casting and nanofiber polyurethane films by using different models

    Year: 2021

    Journal: J. Appl. Polym. Sci., Volume 138, SEP 5

    Authors: Gradinaru, Luiza Madalina; Barbalata-Mandru, Mihaela; Vlad, Stelian; Petrescu, Mioara

    Organizations: European Social Fund

    Keywords: manufacturing; polyurethane; structure-property relationships; synthesis and processing techniques; theory and modeling

    The components of the surface free energy (SFE) were determined from static contact angle measurements of five liquids using different methods. The two manufacturing techniques (casting and electrospinning) applied to obtain polyurethane (PU) membranes give surfaces with different wetting properties. The SFE data varied and were strongly dependent on calculations methods and liquids that were used for contact angle measurements. As a whole, the SFE of electrospun PU membrane (PU-N) (similar to 24 mN/m) was slightly higher than that of casting PU membrane (PU-F) (similar to 18 mN/m) with similar chemical compositions. The overall increase in the value of SFE is mainly due to the microstructures with increased surface area and modulations of nanofibers. The results evidence the impact of the PU membrane preparation on the properties of the biomaterial surface. Such structure-properties-function relationship is necessary to lay the groundwork for establishing a set of design criteria to guide the fabrication of synthetic materials.
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