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High-pressure crystallization of poly(lactic acid) with and without N2 atmosphere protection

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Abstract

High-pressure crystallization experiments of poly(lactic acid) (PLA) were conducted under air and N2 atmosphere. Compared with the sharp decrease of the molecular weight of air sample from 1.63 × 105 to 3.11 × 104, the weight loss of N2 protection sample was successfully restricted to the value below 10 %. Stable α-crystals were generated in both air and N2 protection samples which both exhibited very high crystallinity up to 66.3 and 64.5 %, respectively. It is high pressure that leads to the perfect crystalline structure by inducing crystalline reorganization and lamellar thickening. A diffraction streak appeared in the 2D-SAXS pattern of air sample in contrast to the broad scattering signal in N2 protection sample, implying the formation of oriented crystals during PLA degradation. As observed from scanning electron microscopy, the spherulite size of air sample was larger than that of N2 protection sample, for the radius growth rate of PLA crystals increased as molecular weight decreased. Accordingly, N2 atmosphere protection can not only effectively prevent PLA from degradation, but also acquire highly crystallized PLA.

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Acknowledgements

The authors sincerely thank the financial supports from the National Natural Science Foundation of China (Grant No. 51120135002) and the National Outstanding Youth Foundation of China (Grant No. 50925311).

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Authors and Affiliations

  1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, Sichuan, China

    Jin Zhang, Hua-Mo Yin & Zhong-Ming Li

  2. Analytical and Testing Center, Sichuan University, Chengdu, 610065, Sichuan, China

    Chen Chen & Gui-Ping Yuan

  3. Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794-3400, USA

    Benjamin S. Hsiao

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  1. Jin Zhang
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  2. Hua-Mo Yin
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  3. Chen Chen
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Correspondence to Gui-Ping Yuan or Zhong-Ming Li.

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Zhang, J., Yin, HM., Chen, C. et al. High-pressure crystallization of poly(lactic acid) with and without N2 atmosphere protection. J Mater Sci 48, 7374–7383 (2013). https://doi.org/10.1007/s10853-013-7552-x

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  • DOI: https://doi.org/10.1007/s10853-013-7552-x

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