Reprocessability of PHB in extrusion: ATR-FTIR, tensile tests and thermal studies
Date
2017
Authors
Rivas, Leonardo Fabio
Casarin, Suzan Aline
Nepomuceno, Neymara Cavalcante
Alencar, Marie Isabele
Marcondes Agnelli, Jose Augusto
de Medeiros, Eliton Souto
Wanderley Neto, Alcides de Oliveira
de Oliveira, Mauricio Pinheiro [UNIFESP]
de Medeiros, Antonio Marcos
Ferreira e Santos, Amelia Severino
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Journal Title
Journal ISSN
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Abstract
Mechanical recycling of biodegradable plastics has to be encouraged, since the consumption of energy and raw materials can be reduced towards a sustainable development in plastics materials. In this study, the evolution of thermal and mechanical properties, as well as structural changes of poly(hydroxybutyrate) (PHB) up to three extrusion cycles were investigated. Results indicated a significant reduction in mechanical properties already at the second extrusion cycle, with a reduction above 50% in the third cycle. An increase in the crystallinity index was observed due to chemicrystallization process during degradation by chain scission. On the other hand, significant changes in the chemical structure or in thermal stability of PHB cannot be detected by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analyses (TGA), respectively.
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Citation
Polimeros-Ciencia E Tecnologia. Sao Carlos, v. 27, n. 2, p. 122-128, 2017.