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<p>To adjust and optimize the structure and characteristics of biodegradable poly (butylene succinate) (PBS)-type polyesters, seven aliphatic polyesters with different chain lengths were synthesized by introducing azelaic acid. It can be finded that the melting points of the six polyesters gradually rise with increasing carbon chain length, with the exception of poly(propylene azelate) (PPAz). The XRD analysis reveals that the odd–even effect exerts a certain influence on the diffraction peaks. Specifically, the diffraction angles of odd-odd carbon polyesters demonstrate a systematic shift in comparison to those of odd–even carbon polyesters. Except for PPAz and poly(hexylene azelate) (PHAz), the hydrophilicity of the polyesters decreases with increasing chain length, with PHAz being the most hydrophilic polyester. The thermal decomposition temperatures of the seven polyesters exceed 315.0&#xa0;°C, indicating good thermal stability. Among them, poly(decylene azelate) (PDAz) exhibits the highest thermal decomposition temperature, reaching as high as 358.1&#xa0;°C. Enzyme hydrolysis studies show that poly(pentylene azelate) (PPeAz) has the best biodegradability, with the polyester experiencing 100% weight loss after 12&#xa0;h of enzymatic degradation.</p> Graphical Abstract <p></p>

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Influence of Carbon Chain Length and Odd–Even Effect on the Properties of Azelaic Acid-Based Aliphatic Polyesters

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Xiaorui Zhou,
  • Ying Yang,
  • Chang Lv,
  • Xinru Cheng,
  • Wenbo Hao,
  • Tingting Su,
  • Chenhao Huang,
  • Bing Hu

摘要

To adjust and optimize the structure and characteristics of biodegradable poly (butylene succinate) (PBS)-type polyesters, seven aliphatic polyesters with different chain lengths were synthesized by introducing azelaic acid. It can be finded that the melting points of the six polyesters gradually rise with increasing carbon chain length, with the exception of poly(propylene azelate) (PPAz). The XRD analysis reveals that the odd–even effect exerts a certain influence on the diffraction peaks. Specifically, the diffraction angles of odd-odd carbon polyesters demonstrate a systematic shift in comparison to those of odd–even carbon polyesters. Except for PPAz and poly(hexylene azelate) (PHAz), the hydrophilicity of the polyesters decreases with increasing chain length, with PHAz being the most hydrophilic polyester. The thermal decomposition temperatures of the seven polyesters exceed 315.0 °C, indicating good thermal stability. Among them, poly(decylene azelate) (PDAz) exhibits the highest thermal decomposition temperature, reaching as high as 358.1 °C. Enzyme hydrolysis studies show that poly(pentylene azelate) (PPeAz) has the best biodegradability, with the polyester experiencing 100% weight loss after 12 h of enzymatic degradation.

Graphical Abstract