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Memorias de investigación
Artículos en revistas:
Confined crystallization of nanolayered poly(ethylene terephthalate) using X-ray diffraction methods
Año:2012
Áreas de investigación
  • Macromoléculas y polímeros
Datos
Descripción
The development of crystalline lamellae in ultra-thin layers of poly(ethylene terephthalate) PET confined between polycarbonate (PC) layers in an alternating assembly is investigated as a function of layer thickness by means of X-ray diffraction methods. Isothermal crystallization from the glassy state is in-situ followed by means of small-angle X-ray diffraction. It is found that the reduced size of the PET layers influences the lamellar nanostructure and induces a preferential lamellar orientation. Two lamellar populations, flat-on and edge-on, are found to coexist in a wide range of crystallization temperatures (Tc = 117?150 °C) and within layer thicknesses down to 35 nm. Flat-on lamellae appear at a reduced crystallization rate with respect to bulk PET giving rise to crystals of similar dimensions separated by larger amorphous regions. In addition, a narrower distribution of lamellar orientations develops when the layer thickness is reduced or the crystallization temperature is raised. In case of edge-on lamellae, crystallization conditions also influence the development of lamellar orientation; however, the latter is little affected by the reduced size of the layers. Results suggest that flat-on lamellae arise as a consequence of spatial confinement and edge-on lamellae could be generated due to the interactions with the PC interface.
Internacional
Si
JCR del ISI
Si
Título de la revista
Polymer
ISSN
0032-3861
Factor de impacto JCR
3,438
Información de impacto
Volumen
DOI
Número de revista
53
Desde la página
3986
Hasta la página
3993
Mes
SIN MES
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Participantes
  • Autor: Almudena Ochoa Mendoza (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Polímeros, Caracterización y Aplicaciones
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