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PICA中的酚醛树脂热分解机理
柳云钊,师建军,王 筠,冯志海,杨云华
(航天材料及工艺研究所,先进功能复合材料技术重点实验室,北京 100076)
摘要:
采用TG-FTIR和PyGC-MS联用仪对PICA中酚醛热分解过程和产物进行分析和研究,结果表明,PICA酚醛存在两个明显热失重阶段。第一阶段失重为酚醛小分子解吸附过程,主要为H2O、CO2和HOCH2CH2OH分子;第二阶段主要是由酚醛化学键断裂反应引起,为主要热分解阶段,产物主要为酚类、苯系物和稠环芳烃。经过高温热解后,酚醛基体与高孔隙率碳纤维增强体结合形成疏松多孔且具有一定强度的碳层结构。
关键词:  PICA,酚醛树脂,热分解机理,TG-FTIR,PyGC-MS
DOI:
分类号:TQ323.1
基金项目:
Pyrolysis Mechanism of PICA Phenolics
LIU Yunzhao, SHI Jianjun, WANG Yun, FENG Zhihai, YANG Yunhua
(Science and Technology on Advanced Functional Composites Laboratory,Aerospace Research Institute of Materials & Processing Technology,Beijing 100076)
Abstract:
The pyrolytic process and volatiles of PICA porous phenolics at different stages were investigated by TG-FTIR and PyGC-MS.The results demonstrated that PICA porous phenolics presented two evident weight loss processes.The desorption of small molecules of PICA porous phenolics took place during the first process and H2O,CO2,HOCH2CH2OH are the main volatiles.The molecular chain of porous phenolics broke up and phenols,benzene series,fused ring aromatics evolved during the second process and it is the main stage of thermal degradation. After high-temperature pyrolysis loose and porous char with a certain strength is formed by the combination of porous phenolics matrix with high porosity carbon fiber reinforcement.
Key words:  PICA,Porous phenolics,Pyrolysis mechanism,TG-FTIR,PyGC-MS