Compatibility of biodegradable poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) blends for packaging application

Compatibility of biodegradable poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) blends for packaging application

Bhatia, A, Gupta, R, Bhattacharya, S and Choi, H 2007, 'Compatibility of biodegradable poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) blends for packaging application', Korea-Australia Rheology Journal, vol. 19, no. 3, pp. 125-131.

Document type:	Journal Article
Collection:	Journal Articles

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Title	Compatibility of biodegradable poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) blends for packaging application
Author(s)	Bhatia, A Gupta, R Bhattacharya, S Choi, H
Year	2007
Journal name	Korea-Australia Rheology Journal
Volume number	19
Issue number	3
Start page	125
End page	131
Total pages	7
Publisher	Korean Society of Rheology
Abstract	Biodegradable polymeric blends are expected to be widely used by industry due to their environmental friendliness and comparable mechanical and thermal properties. Poly (lactic acid) (PLA) and poly (butylene succinate) (PBS) are such biodegradable polymers which aim to replace commodity polymers in future applications. Since cost and brittleness of PLA is quite high, it is not economically feasible to use it alone for day to day use as a packaging material without blending. In this study, blends of PLA and PBS with various compositions were prepared by using a laboratory-scale twin-screw extruder at 180ºC. Morphological, thermal, rheological and mechanical properties were investigated on the samples obtained by compression molding to explore suitability of these compositions for packaging applications. Morphology of the blends was investigated by scanning electron microscopy (SEM). Morphology showed a clear phase difference trend depending on blend composition. Modulated differential scanning calorimetry (MDSC) thermograms of the blends indicated that the glass transition temperature ( ) of PLA did not change much with the addition of PBS, but analysis showed that for PLA/PBS blend of up to 80/20 composition there is partial miscibility between the two polymers. The tensile strength and modulus were measured by the Instron Universal Testing Machine. Tensile strength, modulus and percentage (%) elongation at break of the blends decreased with PBS content. However, tensile strength and modulus values of PLA/PBS blend for up to 80/20 composition nearly follow the mixing rule. Rheological results also show miscibility between the two polymers for PBS composition less than 20% by weight. PBS reduced the brittleness of PLA, thus making it a contender to replace plastics for packaging applications. This work found a partial miscibility between PBS and PLA by investigating thermal, mechanical and morphological properties.
Subject	Composite and Hybrid Materials
Keyword(s)	melting behavior miscibility molecular-weight molten blends poly(lactic acid) poly(vinyl acetate) polyethylene rheogoniometry rheological properties vinyl acetate copolymer
Copyright notice	© 2007 The Korean Society of Rheology
ISSN	1226-119X

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