Adipate and Citrate Esters as Plasticizers for Poly(Lactic Acid)/Thermoplastic Starch Sheets

Poly(lactic acid) (PLA) and thermoplastic starch (TPS) sheets plasticized with different adipate and citrate esters were produced by a calendering-extrusion process. The incorporation of plasticizers significantly reduced the glass transition temperature and increased the PLA chain mobility thus imp...

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Bibliographic Details
Published in:Journal of polymers and the environment 2015-03, Vol.23 (1), p.54-61
Main Authors: Shirai, Marianne Ayumi, Müller, Carmen Maria Olivera, Grossmann, Maria Victória Eiras, Yamashita, Fabio
Format: Article
Language:English
Subjects:
Biodegradation
Bioplastics
Calendering
Chemistry
Chemistry and Materials Science
Citrates
Crystallization
Environmental Chemistry
Environmental Engineering/Biotechnology
Esters
Feeds
Industrial Chemistry/Chemical Engineering
Materials Science
Mechanical properties
Original Paper
Phase separation
Plasticizers
Polymer Sciences
Polymers
Starch
Starches
Tensile strength
Thermoplastic resins
Transition temperatures
Water vapor
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Summary:Poly(lactic acid) (PLA) and thermoplastic starch (TPS) sheets plasticized with different adipate and citrate esters were produced by a calendering-extrusion process. The incorporation of plasticizers significantly reduced the glass transition temperature and increased the PLA chain mobility thus improving the mechanical properties. Among the plasticizers employed, diethyl adipate significantly increased the elongation of the sheets and slightly increased the water vapor permeability. Micrographs revealed the incompatibility between starch and PLA, and there was no plasticizer phase separation, suggesting that the plasticizer concentration was adequate. The incorporation of adipate or citrate esters improves the mechanical properties and processability of PLA/TPS sheets produced by calendering extrusion at a pilot scale.
ISSN:1566-2543
1572-8919
1572-8900
DOI:10.1007/s10924-014-0680-9