聚（癸二酸丙酯）和聚（壬二酸丙酯）可生物降解聚酯的热分解：使用 TGA、FTIR 和 GC/MS 评估机制,Journal of Analytical and Applied Pyrolysis

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聚（癸二酸丙酯）和聚（壬二酸丙酯）可生物降解聚酯的热分解：使用 TGA、FTIR 和 GC/MS 评估机制
Journal of Analytical and Applied Pyrolysis ( IF 5.8 ) Pub Date : 2011-09-01 , DOI: 10.1016/j.jaap.2011.05.001
K. Chrissafis , K.M. Paraskevopoulos , G.Z. Papageorgiou , D.N. Bikiaris

摘要本文描述了两种可生物降解的脂肪族聚酯聚（壬二酸丙酯）（PPAz）和聚癸二酸丙酯（PPSeb）的合成、表征和热行为。使用热重分析 (TG) 通过测定加热过程中的质量损失来研究两种聚酯的热降解。从热重曲线可以看出，两种聚酯都是热稳定材料，因为 PPAz 在 411.3 时具有最高的分解率，而 PPSeb 在 413.6 °C 时分解率最高。从活化能 (E) 随着转化率的增加而变化，发现聚酯的分解以复杂的反应机制进行，至少有两种不同的机制参与。为了评估这些机制，TG，使用了 FTIR 和 TG-气相色谱-质谱 (TG/GC-MS) 方法的组合。从形成的分解化合物的质量离子检测发现，两种聚合物的分解主要通过β-氢键断裂，其次通过α-氢键断裂。主要的分解产物是醛、醇、烯丙基、二烯丙基和羧酸。

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Thermal decomposition of poly(propylene sebacate) and poly(propylene azelate) biodegradable polyesters: Evaluation of mechanisms using TGA, FTIR and GC/MS

Abstract The synthesis, characterization and thermal behavior of two biodegradable aliphatic polyesters poly(propylene azelate) (PPAz) and poly(propylene sebacate) (PPSeb) are described in the present work. The thermal degradation of both polyesters was studied using thermogravimetric analysis (TG) by the determination of their mass losses during heating. From the thermogravimetric curves it can be seen that both polyesters are thermally stable materials since PPAz has its highest decomposition rate at 411.3 while PPSeb at 413.6 °C. From the variation of activation energy (E) with increasing degree of conversion it is found that the polyester's decomposition proceeds with a complex reaction mechanism with the participation of at least two different mechanisms. To evaluate these mechanisms the TG, FTIR and a combination of TG-gas chromatography–mass spectrometry (TG/GC–MS) methods were used. From mass ions detection of formed decomposition compounds, it was found that the decomposition of both polymers takes place, mainly, through β-hydrogen bond scission and secondarily through α-hydrogen bond scission. The main decomposition products are aldehydes, alcohols, allyl, diallyl, and carboxylic acids.

更新日期：2011-09-01

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