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Crystallization of Polymers in Processing Conditions: An Overview

  • J.-M. Haudin and S. A. E. Boyer
Published/Copyright: November 29, 2017
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Abstract

In polymer processing, crystallization generally occurs in complex, inhomogeneous and coupled mechanical (flow, pressure), thermal (cooling rate, temperature gradient) and geometrical (surface of processing tools) conditions. A first route to understand crystallization in processing conditions is to design model experiments to isolate the specific influence of a given parameter. The emphasis will be laid here on the influence of: (i) shear flow through rheo-optical measurements using the commercial RheoScope module, (ii) high cooling rates obtained with the modified hot stage Cristaspeed (up to 2 000 °C min−1) and (iii) high pressures in the original Cristapress cell (up to 200 MPa). Numerical simulation is also a useful tool to understand and predict the coupled phenomena involved in crystallization. Based on Avrami's ideas and equations, a general differential formulation of overall crystallization kinetics has been proposed by Haudin and Chenot (2004). It is able to treat both isothermal and non-isothermal cases, and has been extended to crystallization in a limited volume without and with surface nucleation inducing transcrystallinity.


*Correspondence address, Mail address: Jean-Marc Haudin, MINES ParisTech, PSL Research University, CEMEF – Centre de Mise en Forme des Matériaux, CNRS UMR 7635, CS 10207, 06904 Sophia Antipolis Cedex, France, E-mail:

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Received: 2017-01-13
Accepted: 2017-02-27
Published Online: 2017-11-29
Published in Print: 2017-11-17

© 2017, Carl Hanser Verlag, Munich

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