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Elucidation of Thermal Degradation Model for Low and High Density Polyethylene by Statistical Parameters
ChemistrySelect ( IF 2.1 ) Pub Date : 2020-11-27 , DOI: 10.1002/slct.202003263
Kartik S Iyer 1 , Hemant K Balsora 2 , Shubham D Dixit 1 , Abhishek Sharma 1 , Prashant Sonar 3 , William O. S. Doherty 3 , Anand G. Chakinala 1 , Jyeshtharaj B. Joshi 4
Affiliation  

Solid state decomposition studies of Low and High Density Polyethylene (LDPE and HDPE) have been carried out in the present work. Thermo‐gravimetric analysis (TGA) is utilized to determine the degradation kinetics for pure plastic samples at different heating rates. The distribution of activation energy values and rates estimated using various Iso‐conversional methods have been selected on basis of correlation coefficients. For LDPE, isoconversional method of Friedman and for HDPE Flynn Wall Ozawa methods are used to estimate the distribution of activation energies having their mean values as 256.5 and 257.2 kJ/mol respectively. The inputs from Isoconversional methods are used to determine decomposition behavior with Criado method. Model based studies performed with Criado method identifies the solid‐state degradation follows contracting volume‐sphere (R3) model based on lower statistical parameter values. The identified decomposition model is validated by Coats Redfern method which also results in lower statistical parameter values. This is further validated through a best fit of extent of reaction profile against temperature, substantiating the solid‐state decomposition model followed by given plastic fractions.

中文翻译:

利用统计参数阐明高低密度聚乙烯的热降解模型

低密度聚乙烯和高密度聚乙烯(LDPE和HDPE)的固态分解研究已在本工作中进行。热重分析(TGA)用于确定纯塑料样品在不同加热速率下的降解动力学。已根据相关系数选择了使用各种等转换方法估算的活化能值和速率的分布。对于LDPE,使用弗里德曼的等转换方法和对于HDPE Flynn Wall Ozawa方法来估计均值分别为256.5和257.2 kJ / mol的活化能分布。等转换方法的输入用于确定Criado方法的分解行为。使用Criado方法进行的基于模型的研究可根据较低的统计参数值,根据收缩体积球(R3)模型确定固态降解。识别出的分解模型通过Coats Redfern方法进行了验证,这也导致较低的统计参数值。通过对温度曲线的最佳拟合,进一步证实了这一点,证实了固态分解模型,然后是给定的塑料馏分。
更新日期:2020-11-27
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