Biodegradable Blends Based on Starch and Poly(Lactic Acid): Comparison of Different Strategies and Estimate of Compatibilization |
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Authors: | Emmanuelle Schwach Jean-Luc Six Luc Avérous |
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Institution: | (1) UMR INRA/URCA (FARE), BP 1039, 51687 Reims Cedex 2, France;(2) LCPM, UMR 7568 CNRS-INPL, Nancy University, ENSIC, 1 rue Grandville, B.P. 20451, 54001 Nancy, France;(3) LIPHT-ECPM, UMR 7165, University Louis Pasteur, 25 rue Becquerel, 67087 Strasbourg Cedex 2, France |
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Abstract: | Finding plastic substitutes based on sustainability, especially for short-term packaging and disposable applications has aroused
scientific interest for many years. Starch may be a substitute for petroleum based plastics but it shows severe limitations
due to its water sensitivity and rather low mechanical properties. To overcome these weaknesses and to maintain the material
biodegradability, one option is to blend plasticized starch with another biodegradable polymer. To improve both the compatibility
between the main phases and the performance of the final blend, different compatibilization strategies are reported in literature.
However, the relative efficiency of each strategy is not widely reported. This paper presents three different strategies:
in situ (i) formation of urethane linkages; (ii) coupling with peroxide between starch and PLA, and (iiii) the addition of
PLA-grafted amylose (A-g-PLA) which has been elaborated ex situ and carefully analyzed before blending. This study compares
the effect of each compatibilization strategy by investigating mechanical and thermal properties of each blend. Compatibilizing
behavior of the A-g-PLA is demonstrated, with a significant increase (up to 60%) in tensile strength of starch/PLA blend with
no decrease in elongation at failure. |
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Keywords: | Blend Compatibilization Graft copolymer Poly(lactic acid) Starch |
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