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A gelatin/PLA-b-PEG film of excellent gas barrier and mechanical properties

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Abstract

A polylactic acid-polyethylene glycol block copolymer (PLA-b-PEG) was used as an additive to prepare gelatin/PLA-b-PEG blend films for the first time. The PEG molecule block enhanced the compatibility of the PLA molecule block with gelatin, which greatly improved the excellent mechanical and gas barrier properties of the gelatin film. The film contained 5 wt% PLA-b-PEG possessed the highest tensile strength and the highest elastic modulus. When the PLA-b-PEG content further increased to 20 wt%, the tensile strength, elastic modulus and elongation at the break of the blend film were all higher than pure gelatin film, suggesting that the gelatin/PLA-b-PEG blend film was pliable and tough. The blend film possessed not only excellent oxygen barrier property, but also a much-improved water barrier property. The degradation rate of the blend film was elongated controllably by regulating the content of the PLA-b-PEG copolymer. The blend film showed great potential in the application of food packaging.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51273171), the Natural Science Foundation of Jiangsu Province (No. BK20131226), and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Author notes

  1. Wei Qiao and Mindong Gong contributed equally to this work and their name list was in no particular order.

Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China

    Lijun Ji, Mindong Gong, Wei Qiao, Wenqian Zhang & Richard Erick Dunham

  2. Xishan People’s Hospital of Wuxi, Wuxi, China

    Qingren Liu & Jun Gu

Authors
  1. Lijun Ji
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  2. Mindong Gong
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  3. Wei Qiao
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  4. Wenqian Zhang
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  5. Qingren Liu
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  6. Richard Erick Dunham
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  7. Jun Gu
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Correspondence to Lijun Ji.

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Ji, L., Gong, M., Qiao, W. et al. A gelatin/PLA-b-PEG film of excellent gas barrier and mechanical properties. J Polym Res 25, 210 (2018). https://doi.org/10.1007/s10965-018-1600-9

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