热重分析
化学
热分解
热分析
硫黄
碳纤维
聚合物
化学分解
开裂
分解
等温过程
降级(电信)
逸出气体分析
化学工程
材料科学
有机化学
无机化学
复合数
热的
热力学
复合材料
工程类
物理
电信
计算机科学
作者
Qingguo Zhang,Yang-Hai Zheng,Yongde Yan,Yuelin Wang,Yun Xue,Fuqiu Ma,Jingping Wang,Xin Liu,Zhi Zhang,Milin Zhang
出处
期刊:Polymer
[Elsevier]
日期:2023-07-01
卷期号:280: 126071-126071
被引量:1
标识
DOI:10.1016/j.polymer.2023.126071
摘要
Cation exchange resin (CER) is widely used in chemical production and nuclear power station. However, the thermal degradation and utilization of spent CERs present challenges. For safe and efficient thermal degradation treatment, kinetic analysis using non-isothermal thermogravimetry (TG) was conducted to investigate the oxidation process of CERs under air atmosphere. The study determined that the Avrami-Erofeev (m = 4, f(α) = 4(1-α)[-ln(1-α)]3/4) and Power law model (n = 1/3, f(α) = 3α2/3) were the most appropriate reactions models for the temperature ranges of 300–397.5 °C and 397.5–467.5 °C, respectively. Moreover, the destruction of the sulfonic functional group (-SO3H) and skeleton at different temperature stages were analyzed by FT-IR. The carbon and sulfur elements transformation in gas products and residues were analyzed by combining on-line mass spectrometry and infrared carbon-sulfur analysis. The results reveal that the degradation process of CERs can be divided into four stages: dehydration, functional group degradation, skeleton degradation, and residual carbon oxidation. Functional groups are used as active sites to form reaction cores. Then the skeleton is decomposed by the power law model, which provides a new research idea for the thermal decomposition of polymers. In addition, the study offers insights into advancing polymer heat treatment technologies and for safety evaluation.
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