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<p> To improve the ductility of polylactic acid (PLA) and broaden its application, we synthesized poly(butylene glutarate-co-2,5-furandicarboxylate) (PBGF) via melt polycondensation from 2,5-furandicarboxylic acid (FDCA), glutaric acid (GA) and 1,4-butanediol (BDO). We prepared PLA/PBGF blends from PLA and PBGF at mass ratios of 90/10, 80/20, and 70/30. The chemical structure and molecular weight of PBGF were characterized. The thermal properties, mechanical properties, microstructure, crystal structure and processability of the blends were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tensile test, dynamic thermal mechanical analysis (DMA), scanning electron microscopy (SEM), X-ray diffraction (XRD) and rheological analysis. The results showed that the random copolyester PBGF was successfully synthesized. Its number-average molecular weight (<i>M</i><sub>n</sub>) was 36,200&#xa0;g/mol, weight-average molecular weight (<i>M</i><sub>w</sub>) was 84,900&#xa0;g/mol, and polydispersity index (<i>D</i>) was 2.3. PBGF is a crystalline material, while PLA/PBGF blends have an approximate amorphous structure. With the increase of the PBGF content from 0 wt% to 30 wt%, the elongation at break increased significantly from 10.3% to 255.2%, the glass transition temperature (<i>T</i><sub>g</sub>) decreased from 61.18 ℃ to 57.59 ℃, and the fracture mode changed from brittle fracture to ductile fracture. SEM and DMA confirmed PLA and PBGF had partial compatibility, island structure was formed in the blend, and shear bands appeared after stretching, which effectively improved the energy absorption capacity. Rheological tests showed that PBGF improved the processing stability of PLA. In this study, the ductility of PLA was improved by PBGF, which provides a new way to prepare high-performance biodegradable polymer.</p>

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Ductile Polylactic Acid Blends Containing Bio-Based Poly(Butylene Glutarate-co-2,5-furandicarboxylate)

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Zhenxiao Zhao,
  • Jun Jia,
  • Ning Zhang,
  • Jing Hu,
  • Chao Qi,
  • Jingyuan Feng,
  • Haiyang Li,
  • Yi Qin,
  • Guoqiang Wang

摘要

To improve the ductility of polylactic acid (PLA) and broaden its application, we synthesized poly(butylene glutarate-co-2,5-furandicarboxylate) (PBGF) via melt polycondensation from 2,5-furandicarboxylic acid (FDCA), glutaric acid (GA) and 1,4-butanediol (BDO). We prepared PLA/PBGF blends from PLA and PBGF at mass ratios of 90/10, 80/20, and 70/30. The chemical structure and molecular weight of PBGF were characterized. The thermal properties, mechanical properties, microstructure, crystal structure and processability of the blends were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tensile test, dynamic thermal mechanical analysis (DMA), scanning electron microscopy (SEM), X-ray diffraction (XRD) and rheological analysis. The results showed that the random copolyester PBGF was successfully synthesized. Its number-average molecular weight (Mn) was 36,200 g/mol, weight-average molecular weight (Mw) was 84,900 g/mol, and polydispersity index (D) was 2.3. PBGF is a crystalline material, while PLA/PBGF blends have an approximate amorphous structure. With the increase of the PBGF content from 0 wt% to 30 wt%, the elongation at break increased significantly from 10.3% to 255.2%, the glass transition temperature (Tg) decreased from 61.18 ℃ to 57.59 ℃, and the fracture mode changed from brittle fracture to ductile fracture. SEM and DMA confirmed PLA and PBGF had partial compatibility, island structure was formed in the blend, and shear bands appeared after stretching, which effectively improved the energy absorption capacity. Rheological tests showed that PBGF improved the processing stability of PLA. In this study, the ductility of PLA was improved by PBGF, which provides a new way to prepare high-performance biodegradable polymer.