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<p>The poor heat resistance of polylactic acid (PLA) limits its use in heat-resistant packaging and tableware. To circumvent this issue, stereocomplex crystals (SCs) of PLA have shown great potential owing to their high melting point of above 220 °C. However, the slow rate of formation and limited proportion of SCs in PLA materials severely limits the improvement in heat resistance. In industry, where a fast production is often required to reduce costs, it is difficult to prepare PLA materials with a high proportion of SCs. In this study, the effects of the introduction of decanedioic acid, 1,10-bis(2-benzoylhydrazide) (TMC) and the poly(D-lactic acid) (PDLA) and poly(L-lactic acid) (PLLA) content on the proportion and crystallization rate of SCs were explored. Among the prepared TMC/PDLA/PLLA composites, the sample with a TMC/PDLA/PLLA composition of 0.5%/30%/70% exhibited the highest SCs crystallinity (38%) and the highest Vicat softening temperature (96 °C). Moreover, the semi-crystallization time was reduced from 8.3 for PLLA to 2.3 min, resulting in a 64.3% reduction in complete crystallization time. The heat resistance and deformation resistance of the mixed samples in water were also improved, which allowed the samples to be continuously heated for 1&#xa0;h in water at 97 °C while maintaining good deformation resistance.</p> Graphical Abstract <p></p>

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Study on the Synergistic Effect of Hydrazine Nucleating Agents and Stereocomplex Crystals on Improving the Crystallization Behavior and Heat Resistance of Polylactic Acid

  • 期刊论文

  • 发表日期：

    2025年4月17日

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  • Pengrui Chen,
  • Lijun Cao,
  • Kang Chen,
  • Bei Qi,
  • Ce Sun,
  • Haiyan Tan,
  • Yanhua Zhang

摘要

The poor heat resistance of polylactic acid (PLA) limits its use in heat-resistant packaging and tableware. To circumvent this issue, stereocomplex crystals (SCs) of PLA have shown great potential owing to their high melting point of above 220 °C. However, the slow rate of formation and limited proportion of SCs in PLA materials severely limits the improvement in heat resistance. In industry, where a fast production is often required to reduce costs, it is difficult to prepare PLA materials with a high proportion of SCs. In this study, the effects of the introduction of decanedioic acid, 1,10-bis(2-benzoylhydrazide) (TMC) and the poly(D-lactic acid) (PDLA) and poly(L-lactic acid) (PLLA) content on the proportion and crystallization rate of SCs were explored. Among the prepared TMC/PDLA/PLLA composites, the sample with a TMC/PDLA/PLLA composition of 0.5%/30%/70% exhibited the highest SCs crystallinity (38%) and the highest Vicat softening temperature (96 °C). Moreover, the semi-crystallization time was reduced from 8.3 for PLLA to 2.3 min, resulting in a 64.3% reduction in complete crystallization time. The heat resistance and deformation resistance of the mixed samples in water were also improved, which allowed the samples to be continuously heated for 1 h in water at 97 °C while maintaining good deformation resistance.

Graphical Abstract