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<p>An efficient strategy has been developed to reconstruct chain folding and traversing of poly(L-lactide) (PLLA) during melt crystallization based on the selective hydrolysis of its amorphous regions. The molecular weights of the pristine PLLA (crystalline part), single stem, and single cluster were determined by gel permeation chromatography (GPC) according to their evolution during alkali hydrolysis. The maximum-folding-number (in a single cluster) and minimum-cluster-number (in one polymer chain) were obtained using these molecular weights. With the help of two numbers, the chain folding and traversing during the melt crystallization process (at 120 °C) of PLLA can be described as follows. Statistically, in a single polymer chain, there are at least 2 clusters consisting of up to 6.5 stems in each of them, while the rest of the polymer chain contributes to amorphous regions. Our results provide a new strategy for the investigation and fundamental understanding of the melt crystallization of PLLA.</p>

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Investigation of Chain Folding and Traversing During Melt Crystallization of Poly(L-lactide) Based on Selective Alkali Hydrolysis of Its Amorphous Regions

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Yu-Fei Dong,
  • Xin-Yang Zhou,
  • Zhao-Hua Ren,
  • Jia-Chen Zhang,
  • Man Xi,
  • Jia-Yao Wang,
  • Ji-Chun You

摘要

An efficient strategy has been developed to reconstruct chain folding and traversing of poly(L-lactide) (PLLA) during melt crystallization based on the selective hydrolysis of its amorphous regions. The molecular weights of the pristine PLLA (crystalline part), single stem, and single cluster were determined by gel permeation chromatography (GPC) according to their evolution during alkali hydrolysis. The maximum-folding-number (in a single cluster) and minimum-cluster-number (in one polymer chain) were obtained using these molecular weights. With the help of two numbers, the chain folding and traversing during the melt crystallization process (at 120 °C) of PLLA can be described as follows. Statistically, in a single polymer chain, there are at least 2 clusters consisting of up to 6.5 stems in each of them, while the rest of the polymer chain contributes to amorphous regions. Our results provide a new strategy for the investigation and fundamental understanding of the melt crystallization of PLLA.