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<p>Poly(lactic acid) (PLA) is a potential material owing to its biodegradability; however, its inherently low crystallinity limits its large-scale use. This study reports the synthesis of glyceryl lactate (GLY LAC) by condensation polymerization at 190&#xa0;°C for 8&#xa0;h from bio-based sources of controllable molecular weight (1:3, 1:6, 1:9, and 1:12 molar ratios of glycerol and lactic acid) and their application as highly effective nucleating agents for PLA. The success and purity of the polymerization reaction of glyceryl lactate (GLY- LAC) were proven using acid value, viscosity, FTIR, and NMR spectroscopy. DSC analysis indicated that GLY LAC with a 1:6 molar ratio is the most suitable compound to act as a nucleating agent for PLA, which yielded a crystallinity degree of 87.8 ± 1.7% when the optimum values of temperature (110&#xa0;°C), time (150&#xa0;min), and concentration (10 wt %) were applied. Enhanced mechanical properties of PLA were also observed, including increased tensile strength (68.7 ± 2.4&#xa0;MPa), Young’s modulus (3.52 ± 0.18 GPa), and elongation at break (14.8 ± 0.9%). These results demonstrate that GLY LAC simultaneously serves as both a nucleator and plasticizer.</p>

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Enhancing Poly (lactic acid) Crystallinity Using Bio-Derived Glyceryl Lactate Oligomers: Effect of Chain Length, Loading, and Annealing Conditions)

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Getachew Tadesse Gurmu,
  • Tatek Temesgen Terfasa,
  • Melakuu Tesfaye Alemea,
  • Kasahun Tsegaye Mekonen

摘要

Poly(lactic acid) (PLA) is a potential material owing to its biodegradability; however, its inherently low crystallinity limits its large-scale use. This study reports the synthesis of glyceryl lactate (GLY LAC) by condensation polymerization at 190 °C for 8 h from bio-based sources of controllable molecular weight (1:3, 1:6, 1:9, and 1:12 molar ratios of glycerol and lactic acid) and their application as highly effective nucleating agents for PLA. The success and purity of the polymerization reaction of glyceryl lactate (GLY- LAC) were proven using acid value, viscosity, FTIR, and NMR spectroscopy. DSC analysis indicated that GLY LAC with a 1:6 molar ratio is the most suitable compound to act as a nucleating agent for PLA, which yielded a crystallinity degree of 87.8 ± 1.7% when the optimum values of temperature (110 °C), time (150 min), and concentration (10 wt %) were applied. Enhanced mechanical properties of PLA were also observed, including increased tensile strength (68.7 ± 2.4 MPa), Young’s modulus (3.52 ± 0.18 GPa), and elongation at break (14.8 ± 0.9%). These results demonstrate that GLY LAC simultaneously serves as both a nucleator and plasticizer.