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Abstract <p>Poly(lactic acid) (PLA) is a promising bio-based plastic but suffers from the drawback of brittleness and slow crystallization rate. Blending with core–shell rubber (CSR) can effectively enhance the toughness of PLA. However, the crystallization rate of PLA/CSR blends is still slow, limiting its applications in fields where thermal resistance is required. Herein, a self-assembly nucleator octamethylenedicarboxylic dibenzoylhydrazide (OMBH) was added to PLA/CSR blends to accelerate PLA crystallization. Nonisothermal and isothermal crystallization results show that the addition of OMBH to PLA/CSR blends remarkably enhances the crystallization of PLA. Nonetheless, under injection molding with cold molds, amorphous parts are obtained for PLA/CSR/OMBH blends, which present poor thermal resistance. Interestingly, the PLA/CSR/OMBH (80/20/0.75) blends in amorphous state present an elongation at break of 300.6%, which is much higher than that of PLA/CSR (80/20) blends (179.2%). The crystallization rate of PLA/CSR/OMBH (80/20/0.75) blends is high enough to obtain crystalline parts during the injection molding cycle with the use of hot molds. As a result, PLA/CSR/OMBH (80/20/0.75) presents remarkable enhancement in thermal resistance and impact strength in comparison with PLA/CSR (80/20). This work demonstrates that adding OMBH can considerably improve the crystallization performance of PLA/CSR blends, providing insights for designing thermal-resistant and tough bio-based PLA materials.</p> Graphical abstract <p></p>

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Enhanced thermal resistance and toughness of poly(lactic acid)/core–shell rubber blends by the aid of nucleating agent

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Qiang Zhou,
  • Shihang Ye,
  • Yue Ren,
  • Mengfan Jing,
  • Yaming Wang

摘要

Abstract

Poly(lactic acid) (PLA) is a promising bio-based plastic but suffers from the drawback of brittleness and slow crystallization rate. Blending with core–shell rubber (CSR) can effectively enhance the toughness of PLA. However, the crystallization rate of PLA/CSR blends is still slow, limiting its applications in fields where thermal resistance is required. Herein, a self-assembly nucleator octamethylenedicarboxylic dibenzoylhydrazide (OMBH) was added to PLA/CSR blends to accelerate PLA crystallization. Nonisothermal and isothermal crystallization results show that the addition of OMBH to PLA/CSR blends remarkably enhances the crystallization of PLA. Nonetheless, under injection molding with cold molds, amorphous parts are obtained for PLA/CSR/OMBH blends, which present poor thermal resistance. Interestingly, the PLA/CSR/OMBH (80/20/0.75) blends in amorphous state present an elongation at break of 300.6%, which is much higher than that of PLA/CSR (80/20) blends (179.2%). The crystallization rate of PLA/CSR/OMBH (80/20/0.75) blends is high enough to obtain crystalline parts during the injection molding cycle with the use of hot molds. As a result, PLA/CSR/OMBH (80/20/0.75) presents remarkable enhancement in thermal resistance and impact strength in comparison with PLA/CSR (80/20). This work demonstrates that adding OMBH can considerably improve the crystallization performance of PLA/CSR blends, providing insights for designing thermal-resistant and tough bio-based PLA materials.

Graphical abstract