Abstract
Bioplastic materials from renewable polymers, like proteins, constitute a highly interesting field for important industrial applications such as packaging, agriculture, etc., in which thermo-mechanical techniques are increasingly being used. This study assesses bioplastic materials produced by injection from blends previously prepared in a batch mixer using various protein concentrates and isolates. A mixing time of 5 min has been selected in order to ensure correct homogenous blends. A comparison between different protein-based specimens was performed by dynamic mechanical thermal analysis, tensile strength, water uptake and transmittance tests. The comparison reveals that the protein nature and the percentage of plasticizer lead to bioplastics with different properties and, consequently, different applications. Protein concentrates and isolates, wastes and surpluses from the food industry, may be useful for producing bioplastics with suitable mechanical properties and processability, as well as biodegradability, by means of suitable mixing and injection moulding conditions.
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Acknowledgments
This work is part of a research project sponsored by Andalousian Government, (Spain) (project TEP-6134) and by “Ministerio de Economía y Competitividad” from Spanish Government (Ref. MAT2011-29275-C02-02/01). The authors gratefully acknowledge their financial support. The authors also acknowledge to the Microanalysis Service and Functional Characterisation Service (CITIUS-Universidad de Sevilla) for providing full access and assistance to the LECO-CHNS-932 and DSC Q20 Calorymetry (TA instruments), respectively. The authors also thank University of Seville for the grant of the VPPI-US.
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Felix, M., Perez-Puyana, V., Romero, A. et al. Production and Characterization of Bioplastics Obtained by Injection Moulding of Various Protein Systems. J Polym Environ 25, 91–100 (2017). https://doi.org/10.1007/s10924-016-0790-7
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DOI: https://doi.org/10.1007/s10924-016-0790-7