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Thermoplastic starch/wood biocomposites processed with deep eutectic solvents

Grylewicz, Amanda, Spychaj, Tadeusz, Zdanowicz, Magdalena
Composites 2019 v.121 pp. 517-524
adhesion, biocomposites, choline, contact angle, glycerol, imidazoles, mixing, modulus of elasticity, plasticizers, potato starch, solvents, sorption, starch, tensile strength, thermoplastics, urea, wood, wood fibers
Thermoplastic starch (TPS) composites were manufactured from potato starch, wood fibers (WF) with content up to 41.5 wt% and deep eutectic solvents (DES) based on choline chloride with urea or glycerol (Gl) as well as imidazole (Im) with Gl. Processing method: mechanical mixing of the components followed by thermocompression with simultaneous WF modification. DES can play a triple role of starch plasticizer, WF surface modifier, and the composite components interfacial adhesion improver. The biocomposites mechanical, thermomechanical, moisture sorption and surface wetting properties were dependent on DES type. The highest TPS/WF performance exhibited composites with Im/Gl: tensile strength up to 11 MPa, Young’s modulus to 590 MPa, moisture sorption to 4 wt% and water contact angle about 100°. Clear correlation between DES activity towards WF and its surface modification on the one side, and mechanical and thermomechanical features of TPS/WF composites manufactured in sustainable process on the other, was found.