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<p>Herein, the effect of <i>in situ</i> formation of the stereocomplex polylactide (sc-PLA) on the crystallization behaviors of poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blends was assessed. When the melt-blending temperature of the PLLA/PDLA blend approached the melting temperature of sc-PLA (approximately 220 °C), a higher relative content of sc-PLA was achieved. Additionally, the relative content of sc-PLA in the PLLA/PDLA blend increased progressively with the increase in PDLA content. Differential scanning calorimetry analysis revealed that the overall crystallization rate of the homocrystal polylactide were enhanced by the presence of sc-PLA. After crystallization at the same temperature (115 and 120 °C), the PLLA/PDLA blends exhibited a shorter half-crystallization time compared to PLLA alone. The size of the microcrystals of PLLA decreased as the sc-PLA content increased. Furthermore, the storage modulus and complex viscosity of the PLLA/PDLA blend increased with higher sc-PLA content. Dynamic mechanical analysis indicated that the glass transition temperature of PLLA in the PLLA/PDLA blends increased with increasing sc-PLA content. Additionally, the Vicat softening temperature increased from 67.8 °C for PLLA alone to 164.7 °C for the PLLA/25PDLA blend, enhancing the heat resistance of the PLLA/PDLA blends. Compared to PLLA alone, the hydrolytic resistance of the PLLA/PDLA blends showed marked improvement.</p>

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Crystallization Properties, Heat Resistance, and Hydrolytic Resistance of Poly(L-lactide)/Poly(D-lactide) Blend Enhanced by In situ Formation of Stereocomplex Polylactide

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • De-Yu Wei,
  • Ni Chen,
  • Zi-Wen Yin,
  • Yan-Bo Li,
  • Gao-Fei Zheng,
  • Jun-Jia Bian,
  • Hong-Wei Pan,
  • Guo-Qiang Wang,
  • Li-Ting He,
  • Yan Zhao,
  • Hui-Liang Zhang

摘要

Herein, the effect of in situ formation of the stereocomplex polylactide (sc-PLA) on the crystallization behaviors of poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blends was assessed. When the melt-blending temperature of the PLLA/PDLA blend approached the melting temperature of sc-PLA (approximately 220 °C), a higher relative content of sc-PLA was achieved. Additionally, the relative content of sc-PLA in the PLLA/PDLA blend increased progressively with the increase in PDLA content. Differential scanning calorimetry analysis revealed that the overall crystallization rate of the homocrystal polylactide were enhanced by the presence of sc-PLA. After crystallization at the same temperature (115 and 120 °C), the PLLA/PDLA blends exhibited a shorter half-crystallization time compared to PLLA alone. The size of the microcrystals of PLLA decreased as the sc-PLA content increased. Furthermore, the storage modulus and complex viscosity of the PLLA/PDLA blend increased with higher sc-PLA content. Dynamic mechanical analysis indicated that the glass transition temperature of PLLA in the PLLA/PDLA blends increased with increasing sc-PLA content. Additionally, the Vicat softening temperature increased from 67.8 °C for PLLA alone to 164.7 °C for the PLLA/25PDLA blend, enhancing the heat resistance of the PLLA/PDLA blends. Compared to PLLA alone, the hydrolytic resistance of the PLLA/PDLA blends showed marked improvement.