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<p>Hydroxyl-terminated poly(L-lactic acid) (PLLA-OH) and poly(butylene carbonate) prepolymer (PBC-OH) were synthesized via ring-opening(ROP) polymerization of lactide and ester exchange polymerization of dimethyl carbonate (DMC) and 1,4-butanediol (BDO), respectively. Subsequently, a chain extension reaction was conducted using diisocyanate as a chain extender to produce a biodegradable multiblock copolymer ester PLLA-PBC. The structural characteristics and molecular weight of PLLA-PBC with different block lengths and mass fractions were analyzed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (<sup>1</sup>H-NMR) and gel permeation chromatography (GPC). The impact of PLLA-PBC’s structure on its properties was examined through various characterization techniques, including differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and tensile testing. The DSC findings revealed that the glass transition temperature of the multiblock copolyester lies between those of PLLA-OH and PBC-OH, with variations in component content leading to a reduction in crystallinity. In addition, tensile tests showed that the addition of PBC segments significantly increased the elongation at break of PLLA.</p>

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Preparation and Properties of Multiblock Polyester Synthesized by Chain Extension Copolymerization of poly(L-lactic acid) and poly(Butylene Carbonate) Prepolymer

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • Shaozhe Yang,
  • Rong Wu,
  • Wei Bai,
  • Qingyin Wang,
  • Jianguo Li,
  • Gongying Wang

摘要

Hydroxyl-terminated poly(L-lactic acid) (PLLA-OH) and poly(butylene carbonate) prepolymer (PBC-OH) were synthesized via ring-opening(ROP) polymerization of lactide and ester exchange polymerization of dimethyl carbonate (DMC) and 1,4-butanediol (BDO), respectively. Subsequently, a chain extension reaction was conducted using diisocyanate as a chain extender to produce a biodegradable multiblock copolymer ester PLLA-PBC. The structural characteristics and molecular weight of PLLA-PBC with different block lengths and mass fractions were analyzed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR) and gel permeation chromatography (GPC). The impact of PLLA-PBC’s structure on its properties was examined through various characterization techniques, including differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and tensile testing. The DSC findings revealed that the glass transition temperature of the multiblock copolyester lies between those of PLLA-OH and PBC-OH, with variations in component content leading to a reduction in crystallinity. In addition, tensile tests showed that the addition of PBC segments significantly increased the elongation at break of PLLA.