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Crystallization of triethyl-citrate-plasticized poly(lactic acid) induced by chitin nanocrystals
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Centre Català del Plàstic (CCP), Universitat Politècnica de Catalunya Barcelona Tech (EEBE-UPC), C/Colom, 114, Terrassa, Spain .ORCID iD: 0000-0002-6857-4110
Centre Català del Plàstic (CCP), Universitat Politècnica de Catalunya Barcelona Tech (EEBE-UPC), C/Colom, 114, Terrassa, Spain .ORCID iD: 0000-0002-4813-6412
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Fibre and Particle Engineering, University of Oulu, Oulu, Finland. Mechanical and Industrial Engineering (MIE), University of Toronto, Toronto, Ontario, Canada.ORCID iD: 0000-0003-4762-2854
2019 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 136, no 36, article id 47936Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to gain a better understanding of the crystallization behavior of triethyl-citrate-plasticizedpoly(lactic acid) (PLA–TEC) in the presence of chitin nanocrystals (ChNCs). The isothermal crystallization behavior of PLA–TEC wasstudied by polarized optical microscopy, scanning electron microscopy, differential scanning calorimetry, and X-ray diffraction (XRD).Interestingly, the addition of just 1 wt % ChNCs in PLA–TEC increased the crystallization rate in the temperature range of 135–125 C.The microscopy studies confirmed the presence of at least three distinct types of spherulites: negative, neutral, and ring banded. TheChNCs also increased the degree of crystallinity up to 32%, even at a fast cooling rate of 25 C min−1. The XRD studies further revealedthe nucleation effect induced by the addition of ChNCs and thus explained the faster crystallization rate. To conclude, the addition of asmall amount (1 wt %) of ChNC to plasticized PLA significantly affected its nucleation, crystal size, and crystallization speed; therefore,the proposed route can be considered suitable for improving the crystallization behavior of PLA. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2019. Vol. 136, no 36, article id 47936
Keywords [en]
chitin nanocrystals, isothermal crystallization, microstructure, plasticizer, poly(lactic acid)
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-73964DOI: 10.1002/APP.47936ISI: 000471755000019Scopus ID: 2-s2.0-85065669156OAI: oai:DiVA.org:ltu-73964DiVA, id: diva2:1316082
Note

Validerad;2019;Nivå 2;2019-06-25 (johcin)

Available from: 2019-05-15 Created: 2019-05-15 Last updated: 2019-07-10Bibliographically approved

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Singh, ShikhaOksman, Kristiina

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