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<p>Poly(L-lactic acid) (PLLA) was dissolved in <i>N,N</i>-dimethyl formamide at an elevated temperature, and cooled at different temperatures (−20 to 25 °C) for gelation. Viscoelastic measurements were carried out, and the flow temperature of the gel cooled approximately 0 °C was the highest among the gels prepared in this study. A fiber network structure formed from densely woven thin fibers was observed in the gel cooled approximately 0 °C using scanning electron microscopy. Similar fibrous structures were observed for all the gel samples prepared in this study, but their morphologies were slightly different from that of the gel cooled at 0 °C. Larger pores were observed in the gel cooled at −20 °C, and the fibers that formed in the gel cooled at 25 °C were thick and nonuniform. The pore area and fiber diameter evaluated by image analysis software supported these morphological differences. X-ray diffraction measurements and viscoelastic measurements were carried out for the gels cooled at different temperatures. The peak intensity assigned for the ε-crystals of PLLA became weaker for the gels cooled at lower temperatures. These results suggested that the structures of the fibrous network in the gels influence their flow temperature.</p>

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Influence of cooling temperature on flow temperature and morphology of poly(L-lactic acid) gel formed by complex crystals with solvents

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Yasuhiro Matsuda,
  • Kaito Tamura,
  • Kei Hosomi,
  • Atsushi Sugita

摘要

Poly(L-lactic acid) (PLLA) was dissolved in N,N-dimethyl formamide at an elevated temperature, and cooled at different temperatures (−20 to 25 °C) for gelation. Viscoelastic measurements were carried out, and the flow temperature of the gel cooled approximately 0 °C was the highest among the gels prepared in this study. A fiber network structure formed from densely woven thin fibers was observed in the gel cooled approximately 0 °C using scanning electron microscopy. Similar fibrous structures were observed for all the gel samples prepared in this study, but their morphologies were slightly different from that of the gel cooled at 0 °C. Larger pores were observed in the gel cooled at −20 °C, and the fibers that formed in the gel cooled at 25 °C were thick and nonuniform. The pore area and fiber diameter evaluated by image analysis software supported these morphological differences. X-ray diffraction measurements and viscoelastic measurements were carried out for the gels cooled at different temperatures. The peak intensity assigned for the ε-crystals of PLLA became weaker for the gels cooled at lower temperatures. These results suggested that the structures of the fibrous network in the gels influence their flow temperature.