Effect of molecular weight on the flow-induced crystallization of isotactic poly(1-butene) View Full Text


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Article Info

DATE

2003-05

AUTHORS

Stefano Acierno, Blandina Palomba, Henning H. Winter, Nino Grizzuti

ABSTRACT

Turbidity measurements were used to characterize the effect of shear flow on the crystallization kinetics of several isotactic poly(1-butene) samples of different molecular weight (MW). Polymer melts were rapidly cooled below the nominal crystallization temperature, and subjected to a shear flow of varying shear rate but constant total deformation. While the quiescent crystallization was found to be essentially MW-independent, a strong effect of MW on the flow-induced crystallization kinetics was observed. It was shown that such an effect could be cast in terms of a characteristic Weissenberg number, which measures the ability of flow to orient the polymer chains. The proposed scaling relation was found to predict correctly the dependence of flow-induced crystallization upon molecular weight, at least when samples of similar molecular weight distribution were considered. The molecular weight scaling was also found to explain qualitatively the observed transition from a low-shear rate isotropic morphology to a high-shear rate rodlike crystalline structure. More... »

PAGES

243-250

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00397-002-0280-9

DOI

http://dx.doi.org/10.1007/s00397-002-0280-9

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1086067859


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