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Tuning the mechanical properties of tapioca starch by plasticizers, inorganic and agro-waste derived fillers
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
2012 (English)In: Polymer science, ISSN 0965-545X, Vol. 2012, no Article ID 463298Article in journal (Refereed) Published
Abstract [en]

Mechanical properties of tapioca starch-based films were tuned by different additives and additive combinations. The additives included plasticizers (glycerol, sorbitol, and citric acid), inorganic fillers (halloysite and kaolin), and agrowaste-based fillers (milled wood flour and rice bran). In addition, new biobased additives were prepared from wood flour and rice bran through liquefaction reaction. Through different additive combinations, starch-based materials with significant differences in tensile properties were designed. Addition of halloysite nanoclay resulted in materials with improved tensile strength at break and rather low strain at break. The effect of kaolin on tensile strength was highly dependent on the used plasticizer. However, in most combinations the addition of kaolin resulted in materials with intermediate tensile strength and strain at break values. The addition of milled wood flour and rice bran improved the tensile strength, while the addition of liquefied fillers especially liquefied rice bran increased the strain at break indicating that liquefied rice bran could have potential as a plasticizer for starch blends.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2012. Vol. 2012, no Article ID 463298
National Category
Polymer Chemistry
URN: urn:nbn:se:kth:diva-95499DOI: 10.5402/2012/463298OAI: diva2:528652

QC 20121121

Available from: 2012-05-28 Created: 2012-05-28 Last updated: 2012-11-21Bibliographically approved
In thesis
1. Agro-Waste Derived Additives for Polylactide and Tapioca Starch
Open this publication in new window or tab >>Agro-Waste Derived Additives for Polylactide and Tapioca Starch
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Development of materials from renewable resources is one of the big challenges facing our world. In this thesis agro-industrial waste derivatives were developed and evaluated as additives for two common renewable polymer matrices, polylactide (PLA) and starch. Two waste products, wood flour (WF) and rice bran (RB) were evaluated in different forms. Milled WF and RB were either used directly to prepare PLA and starch biocomposites or they were liquefied by acid catalyzed hydrolysis to low molecular weight products. The complex polyol mixtures from liquefaction were tested directly as PLA and starch additives or utilized as monomers for synthesis of esters. The synthesized esters were evaluated as plasticizers for PLA and starch. The effect of different additives on tensile properties, miscibility, surface chemistry and morphology were evaluated by Instron, DSC, FTIR, FTIR imaging and SEM. In the case of polylactide films the influence of additives on hydrolytic degradation rate and process was evaluated by following the weight loss, surface changes, compositional changes and/or water-soluble migrants and degradation products by FTIR, SEM, pyrolysis-GC-MS and ESI-MS. The most marked difference in mechanical properties was observed in the case of PLA modified with liquefied wood flour derived ester plasticizer (PWF). Addition of 10 and 30 weight-% plasticizer increased the strain at break from a few percent for pure PLA to over 100 and 300%, respectively. The liquefied rice bran based ester, however, did not form miscible blends with PLA and it did not function as plasticizer. In some cases the impact of additives on the following degradation process was significant. Depending on the used additive, they could either concentrate in the matrix during the hydrolysis of polylactide or they were rapidly released to the surrounding water. In some cases clear hydrolysis catalyzing effects were observed. Liquefied rice bran in combination with mineral fillers and/or traditional plasticizers seemed to have the best potential as starch plasticizer.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 60 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2012:29
Agro-industrial waste, wood flour, rice bran, polylactide, starch, biomass, degradation
National Category
Polymer Technologies
Research subject
SRA - E-Science (SeRC)
urn:nbn:se:kth:diva-95290 (URN)978-91-7501-378-7 (ISBN)
Public defence
2012-06-11, K2, Teknikringen 28, KTH, Stockholm, 10:00 (English)
Swedish e‐Science Research Center

QC 20120528

Available from: 2012-05-28 Created: 2012-05-21 Last updated: 2013-05-23Bibliographically approved

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