Characterization of Thermal Degradation of Glass Fiber Reinforced Polymer Used in High Voltage Composite Insulator in Nitrogen Atmosphere by FTIR and Micro-Morphology Analyses

Shuyuan Wang, Yanfeng Gao, Yi Lu, Jifei Zhang, Xu Zhang, Shuochao Fan, Jingzhe Yu, Yuan Chen, Xinsheng Ma, Hui Wang, Bin Su, Min Liu
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引用次数: 1

Abstract

The thermal degradation behavior of glass fiber reinforced polymer (GFRP) in nitrogen atmosphere was studied in the present work by thermogravimetric analysis (TGA). The changes of GFRP during the thermal degradation process were characterized from both chemical composition and micro physical structure points of view by using Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). The steps of thermal degradation of GFRP in nitrogen were investigated in detail by analyzing the residues at different set temperatures, then the temperature ranges for the disappearance of methyl and aliphatic structure and the appearance of carbonyl and polyaromatic structure were determined with a temperature resolution of 20 °C. The changes of micro physical structure of GFRP during the thermal degradation in nitrogen involved the softening, melt, shrinkage, appearing of twisted and shrink lines, debonding of interface between glass fiber and epoxy resin matrix and releasing the pyrolyzed gas consecutively. Based on the results, the entire process of thermal degradation of GFRP from initial intact to final deterioration in nitrogen up to 800 °C was characterized, the present work is helpful for better understanding of the thermal degradation behavior of GFRP used in high voltage composite insulator as well as in other industry applications involving the temperature rising condition.
高压复合绝缘子用玻璃纤维增强聚合物在氮气气氛中热降解的FTIR和微观形貌分析
采用热重分析法(TGA)研究了玻璃纤维增强聚合物(GFRP)在氮气气氛中的热降解行为。利用傅里叶红外(FTIR)和扫描电子显微镜(SEM)对GFRP在热降解过程中的化学成分和微观物理结构变化进行了表征。通过分析GFRP在不同设定温度下的残基,详细研究了GFRP在氮气中热降解的步骤,在20℃的温度分辨率下,确定了甲基和脂肪族结构消失的温度范围,羰基和多芳族结构出现的温度范围。在氮气热降解过程中,玻璃钢微观物理结构的变化表现为:软化、熔化、收缩、扭曲和收缩线的出现、玻璃纤维与环氧树脂基体界面的脱粘以及热解气体的释放。在此基础上,表征了GFRP在800℃氮气中从初始完好到最终变质的整个热降解过程,有助于更好地理解GFRP在高压复合绝缘子中的热降解行为,以及其他涉及温升条件的工业应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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