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<p>This study investigates the effect of polyethylene glycol (PEG) on the crystallization behavior of polylactide (PLA) and polyvinyl alcohol (PVA) blends with stereocomplex (SC) formation. PLA was prepared using equimolar blends of PLLA and PDLA, with PVA and varying amounts of PEG (0–5 wt%) incorporated as a compatibilizer and crystallization modifier. Differential scanning calorimetry (DSC) was employed to analyze crystallization and melting behavior under various cooling rates. Results show that PEG significantly enhanced stereocomplex formation, as evidenced by a higher melting temperature (~ 230&#xa0;°C) and increased SC crystallinity. At 5 wt% PEG, crystallization occurred faster and more completely, with the disappearance of homocrystal peaks. Non-isothermal kinetics were evaluated using the Avrami and Mo models, revealing that PEG and PVA accelerated primary crystallization while reducing activation energy. The Mo method provided better linear fits across different crystallization fractions. These findings demonstrate that PEG serves not only as a compatibilizer but also as an effective nucleating agent, enabling tunable crystallization behavior in PLLA/PDLA/PVA blends. The developed approach holds promise for controlling thermal and structural properties in biodegradable polymer systems.</p> Graphical abstract <p></p>

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Effect of PEG-Induced stereocomplexation on crystallization behavior of PLA/PVA blends

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Yottha Srithep,
  • Jun Shen,
  • Arissara Phosanam,
  • Nutnicha Imnamkhao,
  • Dutchanee Pholharn

摘要

This study investigates the effect of polyethylene glycol (PEG) on the crystallization behavior of polylactide (PLA) and polyvinyl alcohol (PVA) blends with stereocomplex (SC) formation. PLA was prepared using equimolar blends of PLLA and PDLA, with PVA and varying amounts of PEG (0–5 wt%) incorporated as a compatibilizer and crystallization modifier. Differential scanning calorimetry (DSC) was employed to analyze crystallization and melting behavior under various cooling rates. Results show that PEG significantly enhanced stereocomplex formation, as evidenced by a higher melting temperature (~ 230 °C) and increased SC crystallinity. At 5 wt% PEG, crystallization occurred faster and more completely, with the disappearance of homocrystal peaks. Non-isothermal kinetics were evaluated using the Avrami and Mo models, revealing that PEG and PVA accelerated primary crystallization while reducing activation energy. The Mo method provided better linear fits across different crystallization fractions. These findings demonstrate that PEG serves not only as a compatibilizer but also as an effective nucleating agent, enabling tunable crystallization behavior in PLLA/PDLA/PVA blends. The developed approach holds promise for controlling thermal and structural properties in biodegradable polymer systems.

Graphical abstract