Thermal degradation kinetics study of molten polylactide based on Raman spectroscopy,Polymer Engineering and Science

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Thermal degradation kinetics study of molten polylactide based on Raman spectroscopy
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-11-10 , DOI: 10.1002/pen.25568
Zenan Lin ₁ , Xuemei Guo ₁ , Zhangping He ₁ , Xianrong Liang ₁ , Mengmeng Wang ₁ , Gang Jin ₁

Affiliation

The thermal degradation of polylactide (PLA) during melt processing may lead to poor product properties. In this study, a unique Raman system was applied to explore the thermal degradation kinetics of molten PLA under five different temperatures and three atmospheres. It was found that the intensity of specific Raman bands correlated with the concentration of functional groups in the PLA during the degradation process. Kinetic models for thermal degradation were established based on the intensity of the characteristic band of C‐COO. Kinetic parameters determined by kinetic models quantitatively revealed the effect of temperature and atmosphere on thermal degradation. Furthermore, time sweep rheological tests using the same degradation conditions were performed for verification, and the results corroborated the spectral analyses. This investigation demonstrates the feasibility of Raman spectroscopy for thermal degradation kinetic analysis.

中文翻译：

基于拉曼光谱的熔融聚丙交酯热降解动力学研究

熔体加工过程中聚丙交酯（PLA）的热降解可能导致不良的产品性能。在这项研究中，采用了独特的拉曼系统来研究熔融PLA在五个不同温度和三个大气压下的热降解动力学。发现特定的拉曼谱带的强度与降解过程中PLA中官能团的浓度相关。基于C-COO特征谱带的强度建立了热降解动力学模型。由动力学模型确定的动力学参数定量揭示了温度和气氛对热降解的影响。此外，使用相同的降解条件进行了时间扫描流变学测试，以进行验证，结果证实了光谱分析。

更新日期：2021-01-12

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