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Abstract <p>In this paper, PDLLA was end-capped with 1,4-butanediol to control hydroxyl groups, ensuring a 1 : 1 NCO/OH ratio for MDI chain extension.The chemical degradation, hydrolytic stability, and thermal and mechanical properties of poly(D,L-lactic acid) (PDLLA), as well as its extended polymer obtained by reacting with 4,4'-methylene diphenyl diisocyanate (MDI), were improved. The resulting samples were characteriяed by Fourier transform infrared spectroscopy (FTIR). Thermal properties were measured using differential scanning calorimetry and thermogravimetric analysis. Tensile properties were also measured with a tensile tester. Results showed that when the molar ratio of NCO/OH was 1 : 1, <i>T</i> <sub>g</sub> can be increased from the original 54 to 60°C. The weight loss temperature of 4,4'-methylene diphenyl diisocyanate chaining PDLLA was also enhanced from 10 to 190°C. Tensile strength increased from 19.00 to 39.00 MPa. Hydrolytic stability was approximately 1.5 times that of pure PDLLA. In this manner, PDLLA materials with excellent mechanical properties, thermal stability, and degradation resistance of poly(lactic acid) material were easily obtained.</p>

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Chain Extension of PDLLA with 4,4'-Methylene diphenyl diisocyanate and Its Degradation Performance

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Guorong Liu,
  • Zicheng Wen,
  • Jianning Wu,
  • Zhiyong Liu,
  • Junlin Liu

摘要

Abstract

In this paper, PDLLA was end-capped with 1,4-butanediol to control hydroxyl groups, ensuring a 1 : 1 NCO/OH ratio for MDI chain extension.The chemical degradation, hydrolytic stability, and thermal and mechanical properties of poly(D,L-lactic acid) (PDLLA), as well as its extended polymer obtained by reacting with 4,4'-methylene diphenyl diisocyanate (MDI), were improved. The resulting samples were characteriяed by Fourier transform infrared spectroscopy (FTIR). Thermal properties were measured using differential scanning calorimetry and thermogravimetric analysis. Tensile properties were also measured with a tensile tester. Results showed that when the molar ratio of NCO/OH was 1 : 1, T g can be increased from the original 54 to 60°C. The weight loss temperature of 4,4'-methylene diphenyl diisocyanate chaining PDLLA was also enhanced from 10 to 190°C. Tensile strength increased from 19.00 to 39.00 MPa. Hydrolytic stability was approximately 1.5 times that of pure PDLLA. In this manner, PDLLA materials with excellent mechanical properties, thermal stability, and degradation resistance of poly(lactic acid) material were easily obtained.