The effect of pea fiber and potato pulp on thermal property, surface tension, and hydrophilicity of extruded starch thermoplastics

► The objectives of this study are to ascertain how cellulose fiber and potato pulp affect the properties of thermoplastic starch related to its Tg, surface tension and wettability. The work attempts to establish an essential model to describe the moisture sorption behaviour of extruded films prepared from these materials. ► Addition of either pea fiber or potato pulp was found to have no effect on the Tg of a thermoplastic starch film. ► Moisture content of the film was observed to increase significantly with increasing pea fiber or pulp content. ► Surface tension and hydrophilicity of the films increased with increasing fiber or pulp content, indicating water would more easily wet or spread on the surface.