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Poly(Ethylene Glycol) Grafted Starch Introducing a Novel Interphase in Poly(Lactic Acid)/Poly(Ethylene Glycol)/Starch Ternary Composites

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Abstract

The main purpose of this study is challenging to dramatically improve the toughness of poly(lactic acid) (PLA)/starch by adding poly (ethylene glycol) (PEG) into the composites and grafting PEG molecules onto the surface of starch particles. It was found that the surface grafting of PEG onto starch induced the presence of PEG-rich regions located around the starch particles, caused by migration and aggregation of free PEG molecules. A novel interphase transition layer between PLA and starch was formed, which showed great ability for cavitation and vested large-scaled plastic deformation to PLA matrix. Further mechanical properties tests indicated the formation of interphase layer significantly increase the elongation at break from 10.2 to 254.5%, and notched impact strength from 1.56 to 2.37 kJ/m2 for PLA/PEG/starch ternary composites. The influence of PEG component, ethanol extraction and annealing was also investigated.

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Acknowledgments

This research has been funded by China National Key Technology R&D Project (2007BAE42B05).

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Authors and Affiliations

  1. Ningbo Institute of Material Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo, 315201, Zhejinag Province, China

    Jiwen Wang, Wentao Zhai & Wenge Zheng

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  1. Jiwen Wang
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  2. Wentao Zhai
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  3. Wenge Zheng
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Correspondence to Wenge Zheng.

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Wang, J., Zhai, W. & Zheng, W. Poly(Ethylene Glycol) Grafted Starch Introducing a Novel Interphase in Poly(Lactic Acid)/Poly(Ethylene Glycol)/Starch Ternary Composites. J Polym Environ 20, 528–539 (2012). https://doi.org/10.1007/s10924-012-0416-7

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  • DOI: https://doi.org/10.1007/s10924-012-0416-7

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