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Grafting of Glycidyl Methacrylate onto Poly(lactide) and Properties of PLA/Starch Blends Compatibilized by the Grafted Copolymer

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Abstract

Poly(lactide)-graft-glycidyl methacrylate (PLA-g-GMA) copolymer was prepared by grafting GMA onto PLA in a batch mixer using benzoyl peroxide as an initiator. The graft content was determined with the 1H-NMR spectroscopy by calculating the relative area of the characteristic peaks of PLA and GMA. The result shows that the graft content increases from 1.8 to 11.0 wt% as the GMA concentration in the feed varies from 5 to 20 wt%. The PLA/starch blends were prepared by the PLA-g-GMA copolymer as a compatibilizer, and the structure and properties of PLA/starch blends with or without the PLA-g-GMA copolymer were characterized by SEM, DSC, tensile test and medium resistance test. The result shows that the PLA/starch blends without the PLA-g-GMA copolymer show a poor interfacial adhesion and the starch granules are clearly observed, nevertheless the starch granules are better dispersed and covered by PLA when the PLA-g-GMA copolymer as a compatibilizer. The mechanical properties of the PLA/starch blends with the PLA-g-GMA copolymer are obviously improved, such as tensile strength at break increasing from 18.6 ± 3.8 MPa to 29.3 ± 5.8 MPa, tensile modulus from 510 ± 62 MPa to 901 ± 62 MPa and elongation at break from 1.8 ± 0.4 % to 3.4 ± 0.6 %, respectively, for without the PLA-g-GMA copolymer. In addition, the medium resistance of PLA/starch blends with the PLA-g-GMA copolymer was much better than PLA/starch blends.

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Acknowledgments

This work is supported by the Docking Project of Nanping Industry Development of Wuyi University (N2011WZ05, 2011DJ10), the A Project of Fujian Province Education Department (JA11263).

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Authors and Affiliations

  1. Department of Environment and Architectural Engineering, Wuyi University, Wuyishan, 354300, China

    Junshao Liu, Huihua Jiang & Liangbi Chen

  2. Key Laboratory of Green Chemical Industry and Technology of Fujian Province, Wuyishan, 354300, China

    Junshao Liu

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  1. Junshao Liu
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  2. Huihua Jiang
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  3. Liangbi Chen
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Correspondence to Junshao Liu.

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Liu, J., Jiang, H. & Chen, L. Grafting of Glycidyl Methacrylate onto Poly(lactide) and Properties of PLA/Starch Blends Compatibilized by the Grafted Copolymer. J Polym Environ 20, 810–816 (2012). https://doi.org/10.1007/s10924-012-0438-1

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  • DOI: https://doi.org/10.1007/s10924-012-0438-1

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