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Shear-induced crystallization of polypropylene: Influence of molecular structure

Abstract : The isothermal crystallization of isotactic polypropylenes has been studied under static conditions and under shear flow. The shear was induced by displacement of a glass fibre in the molten polymer. An α-monoclinic crystalline phase was formed with a columnar organization at the surface of the glass fibre, which did not appear under static conditions. The growth rate, constant during shear-induced crystallization experiments, is compared with the results obtained from static crystallizations. An important increase of the growth rate due to the shear flow is observed. This increase depends on the molecular weight and the tacticity of the polypropylene. Actually, the molecular weight and the isotactic index seem to be the most important molecular parameters. Their augmentation leads to a significant increase of the growth rate, which can be increased by a factor of seven, under the present conditions.
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Submitted on : Wednesday, March 9, 2011 - 9:04:41 AM
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Catherine Duplay, Bernard Monasse, Jean-Marc Haudin. Shear-induced crystallization of polypropylene: Influence of molecular structure. Polymer international, Wiley, 1999, 48 (4 - Special Issue: Papers from the 2nd Colloquium of the French Polymer Group), pp.Pages 320-326. ⟨10.1002/(SICI)1097-0126(199904)48:4<320::AID-PI164>3.0.CO;2-7⟩. ⟨hal-00574863⟩



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