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Memorias de investigación
Artículos en revistas:
Effect of different mechanical recycling processes on the hydrolytic degradation of poly(L-lactic acid)
Año:2016
Áreas de investigación
  • Macromoléculas y polímeros
Datos
Descripción
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.
Internacional
Si
JCR del ISI
Si
Título de la revista
Polymer Degradation ans Stability
ISSN
0141-3910
Factor de impacto JCR
Información de impacto
Volumen
133
DOI
10.1016/j.polymdegradstab.2016.09.018
Número de revista
Desde la página
339
Hasta la página
348
Mes
SIN MES
Ranking
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Participantes
  • Autor: Freddys Rickel Beltran Gonzalez (UPM)
  • Autor: Vicente Lorenzo Esteban (UPM)
  • Autor: Maria Ulagares De la Orden Hernandez (UPM)
  • Autor: Joaquin Maria Martinez Urreaga (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Polímeros, Caracterización y Aplicaciones
  • Departamento: Ingeniería Química Industrial y del Medio Ambiente
  • Departamento: Física Aplicada e Ingeniería de Materiales
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