Network Degradation Assessed by Evolved Gas Analysis-Mass Spectrometry Combined with Principal Component Analysis (EGA-MS-PCA): A Case of Thermo-Oxidized Epoxy/Amine Network

编号 020038603

推送时间 20230313

研究领域 林产化工 

年份 2022 

类型 期刊 

语种 英语

标题 Network Degradation Assessed by Evolved Gas Analysis-Mass Spectrometry Combined with Principal Component Analysis (EGA-MS-PCA): A Case of Thermo-Oxidized Epoxy/Amine Network

来源期刊 Macromolecules

期 第386期

发表时间 20230118

关键词 ULTRAVIOLET-IRRADIATION;  MECHANICAL-PROPERTIES;  BUTADIENE RUBBER;  EPOXY-RESINS;  TEMPERATURE;  PYROLYSIS;  COATINGS;  TRANSITION;  OXIDATION;  SCISSION; 

摘要 To study the degradation of thermosetting polymers, we apply a novel method to simultaneously study the chemical structural changes and network topology: evolved gas analysis-mass spectrometry combined with principal component analysis (EGA-MS-PCA). This technique was applied to thermo-oxidative aging of an epoxy/amine network. The signals of various pyrolyzates remain overlapped in the complicated EGA-MS profiles. The key fragments of thermally evolved gases derived from the components of the network are effectively selected by PCA from the complicated EGA-MS profiles. EGA-MS-PCA provides information on the network structure: (i) the oxidized fraction of cross-links (i.e., chemically damaged cross-links), (ii) the relative quantification of unbonded chains, and (iii) the formation of dangling chains. The proposed technique can simultaneously characterize chemical degradation and network structural properties. This characterization technique can be utilized as a generally applicable tool for determining the structural durability of thermosetting polymers.

服务人员 尚玮姣

服务院士 宋湛谦

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