Scholarlink

<p>Poly(lactic acid) (PLA) is an interesting biobased and biodegradable polyester but with the drawback of slow crystallization rate. Herein, the effects of self-nucleation on the crystallization behavior of melt-crystallized, cold-crystallized and as-received PLA specimens were compared. Two grades of PLA with different molecular weights were evaluated. For each grade of PLA, the self-nucleation effect of as-received specimen is the most distinguished, evidenced by the maximum shift of crystallization peak temperature toward higher temperature and the widest self-nucleation temperature span. For as-received high molecular weight PLA (H-PLA), the maximum shift of crystallization peak temperature toward higher temperature and the span of self-nucleation domain are 41.7&#xa0;°C and 7&#xa0;°C, respectively, whereas for as-received low molecular weight PLA (L-PLA), the corresponding values are 35.7&#xa0;°C and 13&#xa0;°C. Crystallization without self-nucleation reveals a sporadic nucleation at lower temperature while the case with self-nucleation shows a predetermined athermal nucleation at higher temperature upon cooling process, indicating different nucleation mechanisms. The analysis of isothermal crystallization kinetics reveals that, for as-received H-PLA or L-PLA specimen, the crystallization rate with self-nucleation is much higher than that without. This work demonstrates that as-received PLA presents excellent self-nucleation effect in enhancing PLA crystallization, providing substantial benefits to actual industrial processing.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of self-nucleation on crystallization of as-received poly (lactic acid)

  • 期刊论文

  • 发表日期：

    2025年12月23日

查看全文
  • Lan Yao,
  • Jin Ying,
  • Lintao Yang,
  • Qiannan Geng,
  • Hewei Ding,
  • Yaming Wang

摘要

Poly(lactic acid) (PLA) is an interesting biobased and biodegradable polyester but with the drawback of slow crystallization rate. Herein, the effects of self-nucleation on the crystallization behavior of melt-crystallized, cold-crystallized and as-received PLA specimens were compared. Two grades of PLA with different molecular weights were evaluated. For each grade of PLA, the self-nucleation effect of as-received specimen is the most distinguished, evidenced by the maximum shift of crystallization peak temperature toward higher temperature and the widest self-nucleation temperature span. For as-received high molecular weight PLA (H-PLA), the maximum shift of crystallization peak temperature toward higher temperature and the span of self-nucleation domain are 41.7 °C and 7 °C, respectively, whereas for as-received low molecular weight PLA (L-PLA), the corresponding values are 35.7 °C and 13 °C. Crystallization without self-nucleation reveals a sporadic nucleation at lower temperature while the case with self-nucleation shows a predetermined athermal nucleation at higher temperature upon cooling process, indicating different nucleation mechanisms. The analysis of isothermal crystallization kinetics reveals that, for as-received H-PLA or L-PLA specimen, the crystallization rate with self-nucleation is much higher than that without. This work demonstrates that as-received PLA presents excellent self-nucleation effect in enhancing PLA crystallization, providing substantial benefits to actual industrial processing.