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e-Polymers

Editor-in-Chief: Agarwal, Seema / Greiner, Andreas

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1618-7229
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Volume 4, Issue 1

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Volume 1 (2001)

Nucleation versus melting point depression of the polycaprolactone phase in polypropylene/polycaprolactone blends

Vittoria Balsamo
  • Corresponding author
  • Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Aptdo. 89000, Caracas 1080A, Venezuela; Fax 0058-212-9063388
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  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Laura Gouveia
  • Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Aptdo. 89000, Caracas 1080A, Venezuela; Fax 0058-212-9063388
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Published Online: 2013-08-31 | DOI: https://doi.org/10.1515/epoly.2004.4.1.163

Abstract

Polypropylene/poly(ε-caprolactone) (PP/PCL) blends were prepared by melt mixing. The thermal behaviour of the blends was investigated using differential scanning calorimetry (DSC) and dynamical rheology in the solid state (RSA). Both non-isothermal and isothermal crystallizations were performed. The Avrami equation was applied to the latter case. DSC and RSA results demonstrated in agreement with morphological observations that PP/PCL blends are immiscible in the whole composition range. PP acts as a nucleating agent for PCL, and when PP forms the disperse phase, it crystallizes in a fractionated fashion. When PCL is the disperse phase, it exhibits an unexpected melting point depression after cooling at 10 °C/min. Such depression was not observed after isothermal crystallizations, indicating that under non-isothermal crystallization kinetic problems show up. Thus, global crystallization is governed by a competition between nucleation and diffusion, which depends on crystallization conditions and composition.

About the article

Published Online: 2013-08-31

Published in Print: 2004-12-01


Citation Information: e-Polymers, Volume 4, Issue 1, 017, ISSN (Online) 1618-7229, ISSN (Print) 2197-4586, DOI: https://doi.org/10.1515/epoly.2004.4.1.163.

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