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<p>Degradation experiments of PBAT, PBAT/TPS and PBAT/TPS/EHBP blends were carried out in natural soil, and their properties and structure changes in different degradation periods were analyzed. The changes of macroscopic surface morphology and weight loss rate of the samples indicated that the addition of TPS promoted the degradation process of PBAT/TPS blends, and the degradation rate of PBAT/TPS/EHBP (3phr) blends was slightly lower than that of PBAT/TPS blends due to the existence of chemical micro-crosslinking. Differential scanning calorimetry (DSC) analysis showed that the degradation of the three samples in soil included a transition from amorphous to crystalline region. This process results in a decrease in the proportion of amorphous region and an increase in the proportion of crystalline region, thus increasing the crystallinity. Therefore, in the molecular structure, the amorphous region is more prone to degradation than the crystalline region. Thermogravimetric analysis (TGA) results showed that the TPS thermal decomposition peak of PBAT/TPS blends disappeared at 60&#xa0;days, and that of PABT/TPS/EHBP blends disappeared at 120&#xa0;days. This indicates that the TPS phase in these two samples was removed from the PBAT matrix with degradation at 60&#xa0;days and 120&#xa0;days, respectively.</p>

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Biodegradation behavior of poly (butylene adipate-co-terephthalate) (PBAT)/thermoplastic starch (TPS) blends toughened and reinforced simultaneously by epoxy-terminated hyperbranched polyester in natural soil

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Yiqi Fang,
  • Rui Tie,
  • Shuyi Zhou,
  • Maolin Guo,
  • Yujuan Jin,
  • Sudan Zhou,
  • Huafeng Tian

摘要

Degradation experiments of PBAT, PBAT/TPS and PBAT/TPS/EHBP blends were carried out in natural soil, and their properties and structure changes in different degradation periods were analyzed. The changes of macroscopic surface morphology and weight loss rate of the samples indicated that the addition of TPS promoted the degradation process of PBAT/TPS blends, and the degradation rate of PBAT/TPS/EHBP (3phr) blends was slightly lower than that of PBAT/TPS blends due to the existence of chemical micro-crosslinking. Differential scanning calorimetry (DSC) analysis showed that the degradation of the three samples in soil included a transition from amorphous to crystalline region. This process results in a decrease in the proportion of amorphous region and an increase in the proportion of crystalline region, thus increasing the crystallinity. Therefore, in the molecular structure, the amorphous region is more prone to degradation than the crystalline region. Thermogravimetric analysis (TGA) results showed that the TPS thermal decomposition peak of PBAT/TPS blends disappeared at 60 days, and that of PABT/TPS/EHBP blends disappeared at 120 days. This indicates that the TPS phase in these two samples was removed from the PBAT matrix with degradation at 60 days and 120 days, respectively.