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Recycling PLA to multifunctional oligomeric compatibilizers for PLA/starch composites
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-7790-8987
2015 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 64, 126-137 p.Article in journal (Refereed) Published
Abstract [en]

Simple one-pot valorization of poly(lactic acid) (PLA) to green additives was demonstrated. PLA was thermally recycled in the presence of polyols, which accelerated the degradation process by reacting with PLA chains. As a result low molecular weight oligomers with polyols end-groups were formed. The reaction between PLA and multifunctional alcohols i.e. glycerol, sorbitol, glucose and starch were confirmed by FTIR, H-1 NMR, SEC and MALDI-MS. The resulting amphiphilic products were evaluated as compatibilizer candidates for PLA/starch blends. Multiple techniques demonstrated that the obtained oligomers strengthened the interfacial adhesion and improved the compatibility and flexibility of extruded and melt-blended PLA/starch composites. The developed one-pot procedure required no solvent or catalyst offering good possibilities for up-scaling. It was, thus, demonstrated that PLA can be recycled to low molecular weight compatibilizers by simple process of thermal heating in the presence of polyols. This provides profound promise for retaining the material value of old PLA products at the same time as biobased additives are produced.

Place, publisher, year, edition, pages
2015. Vol. 64, 126-137 p.
Keyword [en]
Poly (lactic acid), Starch, Polyol, Composites, Compatibilizer, Recycling
National Category
Polymer Technologies
URN: urn:nbn:se:kth:diva-163454DOI: 10.1016/j.eurpolymj.2015.01.004ISI: 000350525100013ScopusID: 2-s2.0-84921263297OAI: diva2:800962

QC 20150408

Available from: 2015-04-08 Created: 2015-04-07 Last updated: 2015-05-22Bibliographically approved
In thesis
1. Closed-loop strategy for recycling of starch and poly (lactic acid) into new materials
Open this publication in new window or tab >>Closed-loop strategy for recycling of starch and poly (lactic acid) into new materials
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Biopolymers such as starch and poly lactic acid (PLA) can be derived from agriculture and are among the most promising biobased plastics for packaging and other short term application. Considering the growing pressure of environmental safety and limited resources on our planet, it would be beneficial to retain the value of waste products by material recycling. A closed-loop strategy from feedstock recycling of biopolymers to utilization of the obtained degradation products as property enhancers in the same biopolymers was demonstrated in the thesis. 

Place, publisher, year, edition, pages
Stockholm,: KTH Royal Institute of Technology, 2015. 43 p.
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:21
National Category
Chemical Engineering
urn:nbn:se:kth:diva-167353 (URN)978-91-7595-557-5 (ISBN)
2015-06-08, K2, KTH, Teknikringen 28, Stockholm, 10:00 (English)

QC 20150522

Available from: 2015-05-22 Created: 2015-05-21 Last updated: 2015-05-22Bibliographically approved

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