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Poly(ester urethane)s with Polycaprolactone Soft Segments: A Morphological Study

Tipo de material: TextoTextoSeries ; Journal of Polymer Science: Part A: Polymer Chemistry, 40(23), p.4117, 2002Trabajos contenidos:
  • Kloss, J
  • Munaro, M
  • Pinto De Souza, G
  • Valente Gulmine, J
  • Hui Wang, S
  • Zawadzki, S
  • Akcelrud, L
Tema(s): Recursos en línea: Resumen: Two series of poly(ester urethane)s were prepared, containing polycaprolactone (PCL)as the soft segment with molecular weights of 530 and 2000. In each series, the soft-segment/hard-segment ratio was varied, and the morphological changes were monitored with differential scanning calorimetry, dynamic mechanical thermal analysis, wide-angle X-ray scattering, and scanning electron microscopy techniques. The polyurethanes with longer PCL segments retained their crystallinity, whereas those with shorter PCL segments did not. A morphological model is proposed, in which a continuous PCL-rich matrix contains both PCL crystallites and domains of urethane hard segments.
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Two series of poly(ester urethane)s were prepared, containing polycaprolactone (PCL)as the soft segment with molecular weights of 530 and 2000. In each series, the soft-segment/hard-segment ratio was varied, and the morphological changes were monitored with differential scanning calorimetry, dynamic mechanical thermal analysis, wide-angle X-ray scattering, and scanning electron microscopy techniques. The polyurethanes with longer PCL segments retained their crystallinity, whereas those with shorter PCL segments did not. A morphological model is proposed, in which a continuous PCL-rich matrix contains both PCL crystallites and domains of urethane hard segments.

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