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Article

Effect of Molar Mass on Critical Specific Work of Flow for Shear-Induced Crystal Nucleation in Poly (l-Lactic Acid)

1
Interdisciplinary Center for Transfer-oriented Research in Natural Sciences, Martin Luther University Halle-Wittenberg, 06099 Halle/Saale, Germany
2
Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany
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Authors to whom correspondence should be addressed.
Academic Editor: Hsin-Lung Chen
Polymers 2021, 13(8), 1266; https://doi.org/10.3390/polym13081266
Received: 5 March 2021 / Revised: 9 April 2021 / Accepted: 11 April 2021 / Published: 13 April 2021
(This article belongs to the Section Polymer Chemistry)
The concept of specific work of flow has been applied for the analysis of critical shearing conditions for the formation of crystal nuclei in poly (l-lactic acid) (PLLA). Systematic variation in both time and rate of shearing the melt in a parallel-plate rheometer revealed that these parameters are interconvertible regarding the shear-induced formation of crystal nuclei; that is, low shear rate can be compensated for by increasing the shear time and vice versa. This result supports the view that critical shearing conditions can be expressed by a single quantity, providing additional options for tailoring polymer processing routes when enhanced nuclei formation is desired/unwanted. Analysis of PLLA of different mass-average molar masses of 70, 90, 120, and 576 kDa confirmed improved shear-induced crystal nucleation for materials of higher molar mass, with critical specific works of flow, above which shear-induced nuclei formation occurs, of 550, 60, 25, and 5 kPa, respectively. View Full-Text
Keywords: shear-induced crystal nucleation; specific work of flow; nucleation; crystallization; poly (l-lactic acid); molar mass shear-induced crystal nucleation; specific work of flow; nucleation; crystallization; poly (l-lactic acid); molar mass
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MDPI and ACS Style

Du, M.; Jariyavidyanont, K.; Kühnert, I.; Boldt, R.; Androsch, R. Effect of Molar Mass on Critical Specific Work of Flow for Shear-Induced Crystal Nucleation in Poly (l-Lactic Acid). Polymers 2021, 13, 1266. https://doi.org/10.3390/polym13081266

AMA Style

Du M, Jariyavidyanont K, Kühnert I, Boldt R, Androsch R. Effect of Molar Mass on Critical Specific Work of Flow for Shear-Induced Crystal Nucleation in Poly (l-Lactic Acid). Polymers. 2021; 13(8):1266. https://doi.org/10.3390/polym13081266

Chicago/Turabian Style

Du, Mengxue, Katalee Jariyavidyanont, Ines Kühnert, Regine Boldt, and René Androsch. 2021. "Effect of Molar Mass on Critical Specific Work of Flow for Shear-Induced Crystal Nucleation in Poly (l-Lactic Acid)" Polymers 13, no. 8: 1266. https://doi.org/10.3390/polym13081266

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