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2007-08-08 - Article/Dans un journal avec peer-review - Anglais - 9 page(s)

Laredo E., Prutski N., Bello A., Grimau M., Castillo Reina Veronica, Müller Alejandro J, Dubois Philippe , "Miscibility in poly(L-lactide)-b-poly(e-caprolactone) double crystalline diblock copolymers" in European Physical Journal E -- Soft Matter, 23, 3, 295-303

  • Edition : Springer Science & Business Media B.V., New York (NY)
  • Codes CREF : Chimie macromoléculaire (DI1315), Catalyses hétérogène et homogène (DI1334)
  • Unités de recherche UMONS : Matériaux Polymères et Composites (S816)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) Thermally stimulated depolarization currents, TSDC, wide-angle X-ray scattering, WAXS, differential scanning calorimetry, DSC, and polarized light optical microscopy, PLOM, have been used to examine poly(L-lactide)-b -poly( -caprolactone) diblock copolymers in a wide composition range. Both components are crystallizable and the miscibility in the amorphous phase has been determined from the behavior of the primary relaxations which are the dielectric manifestation of the glass transition, and also from the superstructural morphology revealed by PLOM and the compositional dependence of the melting points as determined by DSC. Distinct segmental mobilities in the amorphous phase which can be well resolved by TSDC are present; the mode of the slower component shifts to lower temperatures as the PCL content increases while the glass transition of neat PCL is present for all compositions. A relaxation times bimodal distribution is apparent for PCL-rich copolymers. The composition dependence of the multiple glass transitions detected in these weakly segregated copolymers are predicted by the self-concentration model for a miscible blend made of components with a large Tg contrast.

Notes :
  • (Anglais) Lecture en ligne: http://www.springerlink.com/content/j3217173v0q54h08/fulltext.pdf
Identifiants :
  • DOI : 10.1140/epje/i2007-10191-6