Valorization of wool keratin in developing thermo-pressed plasticized films using factorial design
Abstract
In this paper, wool keratin was investigated as feedstock for the production of protein-based plastics. Untreated wool fibers were thermo-pressed using glycerol as plasticizer at different levels (20 %, 30%, and 40%). Compression pressure, time and temperature were varied according to a 23 full factorial design. The mechanical properties were investigated by tensile measurements and discussed with respect to operating conditions. The thermal properties were studied by thermogravimetric analysis and differential scanning calorimetry. The resulting films exhibited a good thermal stability up to 150°C, a low extensibility and a maximum value of tensile strength of 20.33 MPa. It was found that the higher values of tensile strength were obtained for the films formed at the elevated temperatures investigated in this study. Additionally, Fourier transform infrared spectroscopy revealed the formation of hydrogen bonds between wool and glycerol leading to a good compatibility.
The results showed that wool fibers can be processed into bioplastics by a thermoplastic process. Finally, the full factorial design is an efficient method for testing the influence of operatory conditions on tensile properties.
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