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Shear-induced crystallization of polypropylene: Influence of molecular weight

Abstract : Three series of isotactic polypropylene characterized by different molecular weights and the same isotactic index have been studied during crystallization under static and shearing conditions. The shear is induced by the displacement of a glass fiber in the molten polymer. The monoclinic α-phase is here formed under shear with a columnar organization at the surface of the glass fiber, and does not appear under static condition. The growth-rate, constant during the shear-induced crystallization experiment, is compared with the result obtained from static crystallization. An important increase of the growth-rate due to the shear flow is observed. This increase depends on the molecular structure. The average molecular weights M̄w and M̄z seem to be the most important molecular parameters, for which an excellent correlation is obtained. The increase of these parameters M̄w and M̄z leads to a significant enhancement of the growth-rate, which can be multiplied by a factor of 10 in the present conditions.
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Submitted on : Wednesday, March 9, 2011 - 9:17:11 AM
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Catherine Duplay, Bernard Monasse, Jean-Marc Haudin, Jean-Louis Costa. Shear-induced crystallization of polypropylene: Influence of molecular weight. Journal of Materials Science, Springer Verlag, 2000, 35 (4), pp.Pages 6093-6103. ⟨10.1023/A:1026731917188⟩. ⟨hal-00574875⟩

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