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Thermal and mechanical properties of stereocomplex polylactide enhanced by nanosilica

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Abstract

Stereocomplexable polylactide (sc-PLA) with improved thermomechanical performance had been prepared by melt compounding of poly(L-lactide) (PLLA), poly(D-lactide) (PDLA), and nanosilica. The silica nanoparticles dispersed evenly in the sc-PLA matrix and there were no air bubbles because of good compatibility between nanosilica and sc-PLA. The aggregates size of nanosilica increased with increasing nanosilica content. The introduction of nanosilica facilitated the formation of stereocomplex, which was manifested as the degree of crystallinity of sc-PLA increased from 17.0 to 24.3% as the nanosilica content increased from 0 to 10 wt%. Thermal stability of sc-PLA was greatly improved by adding nanosilica, and the onset of decomposition temperature of sc-PLA/silica nanocomposites was ~33 °C higher than that of neat sc-PLA. Superior storage modulus was found for sc-PLA/silica nanocomposites compared to neat sc-PLA. The tensile strength and modulus of sc-PLA nanocomposites were greatly improved by the addition of nanosilica, but the elongation at break decreased.

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Funding

This work is supported by the“13th five-year” Science and Technology Research Program of the Education Department of Jilin Province (JJKH20190862KJ).

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Authors and Affiliations

  1. College of Material Science and Engineering, Jilin Jianzhu University, Changchun, 130118, China

    Yi Li, Lijia Zhao & Liguang Xiao

  2. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Changyu Han

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  1. Yi Li
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Correspondence to Changyu Han or Liguang Xiao.

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Li, Y., Zhao, L., Han, C. et al. Thermal and mechanical properties of stereocomplex polylactide enhanced by nanosilica. Colloid Polym Sci 299, 1161–1172 (2021). https://doi.org/10.1007/s00396-021-04839-0

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  • DOI: https://doi.org/10.1007/s00396-021-04839-0

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