Abstract
The effect of multiple injection-moulding reprocessing of three biodegradable matrices on their mechanical properties, melt flow rate, molecular weight, phase transition temperatures and degradation temperature is presented. It has been found that, with successive reprocessing, tensile, flexural and impact strength decreased. Drop in mechanical properties has been assigned to degradation of the matrices, as corroborated by melt flow and molecular weight analysis. Although reprocessing did not significantly affect the glass transition, it diminished the melting point and degradation temperature of polymers. Results indicate that neat PLLA can be recycled for up to five times without suffering a drastic loss in mechanical and thermal properties. The aliphatic polyester Mater-Bi TF01U/095R can be recycled for up to 10 times, whilst starch-based Mater-Bi YI014U/C wastes should be destined to composting, since its recyclability is very poor. The effect of reprocessing on composites reinforced with chemithermomechanical pulp (CTMP) followed the tendencies observed for the neat matrices. Whilst CTMP-fibres behave mainly as filler in PLLA composites, reinforced thermoplastic starch-based composites presented enhanced mechanical properties and recyclability.
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Acknowledgments
The work reported is part of the Sustainpack project. An international cooperative project financed by European Union thorough grant NMP3—CT—2004—500311. The authors want to thank their partners in this project: Ecole Francaise de Papeterie et des Industries Grafiques (EFPG) and the University of Oulu for their cooperation and supply of raw materials.
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Lopez, J.P., Girones, J., Mendez, J.A. et al. Recycling Ability of Biodegradable Matrices and Their Cellulose-Reinforced Composites in a Plastic Recycling Stream. J Polym Environ 20, 96–103 (2012). https://doi.org/10.1007/s10924-011-0333-1
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DOI: https://doi.org/10.1007/s10924-011-0333-1