Mechanical recyclability of technical biopolymers: Potential and limits |
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| Institution: | 1. Materials Science and Testing of Polymers, Montanuniversitaet Leoben, Franz-Josef Strasse 18, 8700 Leoben, Austria;2. Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria;1. LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, 4051381 Concepción, Chile;2. Department of Mechanical Engineering, University of the Basque Country, 48013 Bilbao, Spain;1. Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas Professora Eloisa Mano (IMA/UFRJ), Rio de Janeiro, RJ, Brazil;2. Universidade do Estado do Rio de Janeiro, Instituto de Química (IQ/UERJ), Rio de Janeiro, RJ, Brazil;3. Centro de Tecnologia Mineral (CETEM), Rio de Janeiro, RJ, Brazil;4. Universidade do Estado do Rio de Janeiro, Instituto Politécnico do Rio de Janeiro (IPRJ/UERJ), Nova Friburgo, RJ, Brazil;5. Centro de Pesquisa e Desenvolvimento Leopoldo Américo Miguez de Mello - CENPES/PETROBRAS, Rio de Janeiro, RJ, Brazil;6. Universidade Federal do Rio Grande do Sul, Instituto de Química (IQ/UFRGS), Porto Alegre, Rio de Grande do Sul, Brazil;7. Universidade Federal do Rio de Janeiro, Programa de Engenharia Ambiental, Escola Politécnica (PEA/UFRJ), Rio de Janeiro, RJ, Brazil;1. Certech ASBL, Rue Jules Bordet, Zone Industrielle C, B-7180 Seneffe, Belgium;2. Agilent Technologies LDA UK Ltd, Essex Road, Church Stretton, SY6 6AX Shropshire, UK |
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| Abstract: | The mechanical recyclability of the technical biopolymers polytrimethylene terephthalate (PTT), cellulose acetate butyrate (CAB), polybutylene succinate (PBS) and polyhydroxy alkanoate blend (PHBV/PBAT) was evaluated by assessing the effect of repeated polymer processing (extrusion without further compounding with virgin material or additives) on the material structure and mechanical properties. Reprocessing-induced hydrolytic degradation was found to be the prevalent aging mechanism of the investigated biopolymer grades. However, susceptibility to hydrolysis, and thus maintenance of the performance characteristics, differed strongly between the biopolymer types. To that effect, PTT and CAB especially exhibit a high potential for mechanical recycling. By taking advantage of appropriate additivation, the mechanical recyclability of PBS and PHBV/PBAT is also assumed to be high. |
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| Keywords: | Technical biopolymers Processing Mechanical recycling Hydrolysis Aging |
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