Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Effect of different mechanical recycling processes on the hydrolytic degradation of poly(L-lactic acid)
Year:2016
Research Areas
  • Macromolecules and polymers
Information
Abstract
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 ºC 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 º C, while at 58 ºC the differences were smaller. DSC results pointed out that mechanical recycling promotes a slight crystallization of PLA at 37 º C that explains the increasing of the hardness during the hydrolysis.
International
Si
JCR
Si
Title
Polymer Degradation ans Stability
ISBN
0141-3910
Impact factor JCR
Impact info
Volume
133
10.1016/j.polymdegradstab.2016.09.018
Journal number
From page
339
To page
348
Month
SIN MES
Ranking
Participants
  • Autor: Freddys Beltran Gonzalez (UPM)
  • Autor: Vicente Lorenzo Esteban (UPM)
  • Autor: Maria Ulagares De la Orden Hernandez (UPM)
  • Autor: Joaquin Maria Martinez Urreaga (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Polímeros, Caracterización y Aplicaciones
  • Departamento: Ingeniería Química Industrial y del Medio Ambiente
  • Departamento: Física Aplicada e Ingeniería de Materiales
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
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