Crystallization kinetics of chain extended poly(L-lactide)s having different molecular structures

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dc.contributor	Universitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.contributor	Universitat Politècnica de Catalunya. PSEP - Polimers Sintètics: Estructura i Propietats. Polimers Biodegradables.
dc.contributor.author	Yousefzade, Omid
dc.contributor.author	Jeddi, Javad
dc.contributor.author	Franco García, María Lourdes
dc.contributor.author	Puiggalí Bellalta, Jordi
dc.contributor.author	Garmabi, Hamid
dc.date	2020-01-15
dc.identifier.citation	Yousefzade, O. [et al.]. Crystallization kinetics of chain extended poly(L-lactide)s having different molecular structures. "Materials chemistry and physics", 15 Gener 2020, vol. 240, núm. 122217, p. 122217:1-122217:11.
dc.identifier.citation	0254-0584
dc.identifier.citation	10.1016/j.matchemphys.2019.122217
dc.identifier.uri	http://hdl.handle.net/2117/171482
dc.language.iso	eng
dc.relation	https://www.sciencedirect.com/science/article/abs/pii/S0254058419310326
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Àrees temàtiques de la UPC::Enginyeria dels materials
dc.subject	Àrees temàtiques de la UPC::Enginyeria química
dc.subject	Polylactic acid
dc.subject	Crystallization
dc.subject	Chain extended PLLA
dc.subject	Molecular structure
dc.subject	Rheological properties
dc.subject	Crystallization kinetics
dc.subject	Àcid polilàctic
dc.subject	Cristal·lització
dc.title	Crystallization kinetics of chain extended poly(L-lactide)s having different molecular structures
dc.type	info:eu-repo/semantics/submittedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	Poly(L-lactide)s (PLLAs) with different chain structures were prepared by reactive melt processing and using Joncryl ADR as chain extender. Results of gel permeation chromatography (GPC) revealed that chain extended PLLAs had high molecular weights and two differentiated molecular weight distributions. Linear rheology was sensitive to the obtained molecular structures and revealed as the increase on the amount of chain extender gradually led to a decrease of the loss factor in the whole frequency region and to an increase of melt viscosity and both storage and loss moduli. In addition, the entanglement density increased significantly with addition of chain extender and had a significant influence on crystallization kinetics. Correlation of molecular weight, viscosity and entanglements changed the crystallinity and crystallization kinetics of chain extended PLLAs in both isothermal and non-isothermal crystallizations. Specifically, samples prepared from 1 wt-% of Joncryl (PLLA1R) revealed the highest nucleation and the fastest crystallization rate.

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