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      Effect of accelerated weathering on physico-mechanical properties of polylactide bio-composites

      Sawpan, Moyeenuddin Ahmad; Islam, Muhammad Remanul; Beg, Mohammad Dalour Hossain; Pickering, Kim L.
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      Effect of Accelerated Weathering on Physico-Mechanical Properties of Polylactide Bio-composites.pdf
      Accepted version, 3.199Mb
      DOI
       10.1007/s10924-019-01405-2
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      Sawpan, M. A., Islam, M. R., Beg, M. D. H., & Pickering, K. L. (2019). Effect of accelerated weathering on physico-mechanical properties of polylactide bio-composites. Journal of Polymers and the Environment, 27(5), 942–955. https://doi.org/10.1007/s10924-019-01405-2
      Permanent Research Commons link: https://hdl.handle.net/10289/13546
      Abstract
      In this work, injection moulded hemp fibre reinforced polylactide bio-composites of different fibre contents (0, 10, 20 and 30 wt%) were subjected to accelerated weathering of 12 h cyclic exposures of UV-light at 60 °C, water spray and condensation at 50 °C for 8, 16, 32, 48 and 64 cycles to study the changes in properties such as crystallinity, tensile, flexural, plane-strain fracture toughness (KIc) and strain energy release rate (GIc). The crystallinity of neat polylactide (PLA) was found to increase up to 50.6% after 64 cycles, whereas the crystallinity of composites of different fibre contents was found to increase in the range of 30.6 to 34.5% for 8 to 64 cycles. The overall mechanical properties (tensile, flexural, KIc and GIc) of the composites decreased as the number of cycles increased from 8 to 64. The crystallinity and the residual tensile strength, tensile modulus, tensile strain, KIc and GIc of the composites of 20 wt% fibres were found to be the highest after 64 cycles. In contrast, the residual flexural strength and flexural modulus of the composites of 30 wt% fibres were found to be the maximum after 64 cycles. Absorption of water, destruction of fibre integrity, degradation of PLA matrix, formation of cracks and pores were found to be the main causes of reduction in the mechanical properties of PLA bio-composites.
      Date
      2019
      Type
      Journal Article
      Publisher
      Springer
      Rights
      © 2019 Springer Science+Business Media, LLC, part of Springer Nature.This is the author's accepted version. The final publication is available at Springer via dx.doi.org/10.1007/s10924-019-01405-2
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