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Rheologica Acta

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01.10.2015 | Original Contribution

Quiescent and shear-induced crystallization of linear and branched polylactides

verfasst von: Naqi Najafi, Marie -Claude Heuzey, Pierre Carreau, Daniel Therriault

Erschienen in: Rheologica Acta | Ausgabe 9-10/2015

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Abstract

The quiescent and shear-induced isothermal crystallization behavior of linear and long-chain branched (LCB) polylactides (PLAs) was investigated at a temperature of 130 °C. LCB-PLAs were produced by the reaction with a multifunctional chain extender, Joncryl©. In quiescent crystallization, the presence of the LCB structure accelerated the nucleation process and reduced the induction time, depending on the level of branching. The impact of shear strain and shear rate on crystallization was also examined. The shear-induced crystallization of the linear and LCB-PLAs was affected by both the total shear strain and shear rate. The crystallization kinetics of the LCB-PLAs was more affected by shear than that of the linear PLA. The crystalline morphology of the linear and LCB-PLAs under quiescent and step shear rate conditions was examined using a Linkam optical shearing system. An increase in the spherulite density was observed in the strained melt of both linear (33 %) and LCB-PLAs (15 %), in comparison with those of unstrained counterparts. Optical micrographs confirmed that the crystal nucleation was affected by the shear flow. Long-chain branching significantly promoted the nucleation density (6.7 times), although it diminished the crystal growth rate from 4.4 to 2.0 μm/min.

Vorheriger Artikel Structural breakdown and recovery of waxy crude oil emulsion gels

Nächster Artikel Modeling confinement in polymer nanocomposites from linear viscoelasticity data

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Titel: Quiescent and shear-induced crystallization of linear and branched polylactides
verfasst von: Naqi Najafi
Marie -Claude Heuzey
Pierre Carreau
Daniel Therriault
Publikationsdatum: 01.10.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Rheologica Acta / Ausgabe 9-10/2015
Print ISSN: 0035-4511
Elektronische ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-015-0874-7

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