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oai:docta.ucm.es:20.500.14352/178882025-02-27T16:02:30Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Beltrán González, Freddys author Lorenzo Esteban, Vicente author Orden Hernández, María Ulagares De La author Martínez Urreaga, Joaquín 2023-06-17T21:59:04Z 2023-06-17T21:59:04Z 2016-11 0141-3910 10.1016/j.polymdegradstab.2016.09.018 https://hdl.handle.net/20.500.14352/17888 http://dx.doi.org/10.1016/j.polymdegradstab.2016.09.018 http://www.sciencedirect.com/science/article/pii/S0141391016302853 The growing production of poly(lactic acid) (PLA) has increased the interest for the mechanical recycling of this polymer. The main objective of this work is to study the effect of different mechanical recycling processes on the hydrolytic degradation of PLA. A commercial grade of PLA was subjected to two different recycling processes, one of them comprising an accelerated thermal and photochemical aging and a second melt compounding and compression molding step, and other including a demanding washing step after the accelerated aging process. The accelerated aging and, especially, the washing step had a significant effect on degradation during recycling. Samples of virgin and recycled plastic immersed in a phosphate buffered solution at 37 or 58 °C were removed at selected times and then characterized by gravimetric analysis, IR and UV spectroscopy, thermal analysis, x-ray diffraction and microhardness and viscosity measurements. The water absorption process, at both temperatures, can be modeled using a Fickian model only when the immersion times were short. The different recycling processes caused an increase of the diffusion coefficient of PLA at 37 °C, while at 58 °C the differences were smaller. DSC results pointed out that mechanical recycling promotes a slight crystallization of PLA at 37 °C that explains the increasing of the hardness during the hydrolysis. eng Effect of different mechanical recycling processes on the hydrolytic degradation of poly(l-lactic acid) journal article URL https://docta.ucm.es/bitstreams/a408b90a-a689-443f-baea-1392da889c3c/download File MD5 744ec6225954e12a087c7a163c25769e 808405 application/pdf effect different mechanical-PolymDegradStab-Elsevier-2016.pdf