Instituto de Tecnología de Materiales, Universitat Politècnica de València, Camino de Vera, s/n, 46022 Valencia, Spain.
Bioresour Technol. 2012 May;111:468-75. doi: 10.1016/j.biortech.2012.02.013. Epub 2012 Feb 14.
The energetic valorization process of bio-based polymers is addressed in this study, taking polylactide (PLA) as model. The pyrolysis of virgin and multiple-injected PLA was simulated by means of multi-rate linear-non-isothermal thermogravimetric experiments. A complete methodology, involving control of gases, thermal stability and thermal decomposition kinetics was proposed. The release of gases was monitored by Evolved Gas Analysis of the fumes of pyrolysis, by in-line FT-IR, with the aid of 2D-correlation IR characterization. A novel model to establish the thermal stability of PLAs under any linear heating profile was proposed. A kinetic strategy was methodically applied to assess the thermal decomposition in terms of activation energy and kinetic model. It was found that the pyrolysis technologies for virgin PLA could be straightforwardly transferred for the valorization of its recyclates.
本研究针对生物基聚合物的能量增值化过程，以聚乳酸（PLA）为模型。通过多速率线性非等温热重实验模拟了原始和多次注射 PLA 的热解。提出了一种完整的方法，包括气体控制、热稳定性和热分解动力学。通过在线傅里叶变换红外光谱（FT-IR）和二维相关红外（2D-IR）分析，监测热解烟雾的逸出气的逸出气体分析（Evolved Gas Analysis，EGA）。提出了一种新的模型来建立 PLA 在任何线性加热曲线下的热稳定性。系统地应用了一种动力学策略，根据活化能和动力学模型来评估热分解。结果发现，原始 PLA 的热解技术可以直接应用于其回收物的增值化。
