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The effect of dynamic vulcanization systems on the mechanical properties and phase morphology of PLA/NR reactive blends

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Abstract

The effects of dynamic vulcanization systems including sulfur, peroxide, and sulfur/peroxide mixed vulcanization were investigated for dynamically-vulcanized blends of polylactic acid (PLA) and natural rubber (NR) at the PLA/NR ratio of 85/15. For the sulfur system, the CV sub-system (CV1), which used much lower accelerator (TBBS) content than the EV sub-system, rendered higher impact strength and higher %crystallinity. When compared to the peroxide system using DCP as a curative, the impact strength of CV1 sample was almost 4 times lower than the peroxide-cured sample even though their rubber domain sizes and size distributions were comparable. Interestingly, the highest impact strength which was almost 6 times that of the unmodified PLA/NR was achieved when using the mixed sulfur/peroxide system at the CV1/peroxide ratio of 30:70 (S30/DCP70). The lower impact strength of the sulfur-cured system (CV1) compared to those of the peroxide and the mixed-vulcanization systems was potentially due to its significantly higher % crystallinity.

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Acknowledgments

This work was supported by the Thailand Science Research and Innovation (TSRI) through the Royal Golden Jubilee Ph.D. Program Scholarship [Grant no. PHD/0058/2557] and the research unit funding, Thammasat University.

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Authors and Affiliations

  1. Research Unit in Polymer Rheology and Processing, Department of Chemical Engineering, Faculty of Engineering, Thammasat University, Pathum Thani, 12120, Thailand

    Peerapong Chanthot, Nittaya Kaeophimmueang & Cattaleeya Pattamaprom

  2. National Science and Technology Development Agency, Ministry of Science and Technology, Polymer Research Unit, National Metal and Materials Technology Center, Pathum Thani, 12120, Thailand

    Patcharee Larpsuriyakul

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  1. Peerapong Chanthot
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  2. Nittaya Kaeophimmueang
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Correspondence to Cattaleeya Pattamaprom.

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Chanthot, P., Kaeophimmueang, N., Larpsuriyakul, P. et al. The effect of dynamic vulcanization systems on the mechanical properties and phase morphology of PLA/NR reactive blends. J Polym Res 28, 34 (2021). https://doi.org/10.1007/s10965-020-02364-2

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