不同分子结构聚酰胺热分解机理研究  

Thermal Decomposition Mechanism of Different Polyamide with Different Molecular Structures

作　　者：王佳敏 史迎杰 白云 邹文奇 王美慧 高峡[1] 郝新敏 WANG Jia-min;SHI Ying-jie;BAI Yun;ZOU Wen-qi;WANG Mei-hui;GAO Xia;HAO Xin-min(Institute of Analysis and Testing,Beijing Academy of Science and Technology(Beijing Center for Physical and Chemical Analysis),Beijing Key Laboralory of Detection Technology and Quality Evaluation of Organic Material,Beijing Engineering Research Center of Food Safety Analysis,Beijing 100089,China;Systems Engineering Institute,Academy of Military Sciences,Beijing 100010,China)

机构地区：[1]北京市科学技术研究院分析测试研究所(北京市理化分析测试中心),有机材料检测技术与质量评价北京市重点实验室,北京市食品安全分析测试工程技术研究中心,北京100089 [2]军事科学院系统工程研究院,北京100010

出　　处：《分析测试学报》2024年第9期1338-1347,共10页Journal of Instrumental Analysis

基　　金：国家重点研发计划(2022YFB3804205);北京市科学技术研究院财政资助项目(24CB003-17)。

摘　　要：采用热分析-红外-质谱联用仪(STA-FTIR-MS)和热裂解/气相色谱-质谱联用仪(Py/GC-MS)对聚酰胺56(PA56)与聚酰胺6(PA6)、聚酰胺66(PA66)的热分解行为进行了比较研究。旨在阐明PA56与PA6、PA66在热分解过程中表现出的差异性及热裂解机理特点。通过阿伦尼乌斯(Arrhenius)方程计算反应活化能(Ea),并进一步通过热裂解实验对PA6、PA66、PA56的热降解产物进行分析。结果表明:PA6、PA66、PA56在氩气中的热降解过程均为一步反应,热降解活化能数值PA6>PA66>PA56,均大于185 kJ/mol,表明三者都具有良好的热稳定性,且PA56相比PA6、PA66热稳定性更好。三者的断裂方式相似,均以酰胺键的α位断裂为主。Thermal decomposition process and pyrolysis mechanism of polyamide 6,66,56(PA6,66,56)were investigated by simultaneous thermal analyzer-fourier transform infrared spectroscopymass spectrometer(STA-FTIR-MS)and pyrolysis/gas chromatography-mass spectrometer(Py/GC/MS).The activation energy(Ea)can be calculated by Arrhenius equation.The thermal degradation products of PA6,PA66,PA56 were further analyzed by pyrolysis experiments.The results showed that the thermal degradation processes of PA6,PA66,PA56 in argon were one step reaction and the thermal degradation activation energy was PA6>PA66>PA56,all greater than 185 kJ/mol,indicat⁃ing that PA6,PA66 and PA56 all have good thermal stability,and PA6 and PA66 have better ther⁃mal stability.The breaking modes of the three are similar,mainly involving the breaking of theα-po⁃sition chemical bond of the amide bond.

关 键 词：聚酰胺 热降解动力学 裂解机理 

分 类 号：O657.3[理学—分析化学] O648[理学—化学]