Crystallization of Polymers in Processing Conditions: An Overview

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.
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Soumis le : lundi 27 novembre 2017 - 11:20:20
Dernière modification le : lundi 12 novembre 2018 - 10:56:50



Jean-Marc Haudin, Séverine A.E. Boyer. Crystallization of Polymers in Processing Conditions: An Overview. International Polymer Processing, 2017, 32 (5), pp.545 - 554. 〈10.3139/217.3415〉. 〈hal-01649103〉



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