摘要
以酚醛树脂(PF)为改性剂,在对甲苯磺酸(PTS)的催化作用下,对C/C复合材料基体前驱体中温煤沥青进行了共炭化改性,并对其热解机理进行了研究。首先,对原料煤沥青及共炭化改性后煤沥青的流变性能进行了测试,并采用热重分析(TGDTG)对改性前后煤沥青热解行为进行了研究,计算出了热解动力学参数。结果表明,在催化剂PTS的催化作用下,煤沥青发生了脱甲基反应,并且当PF含量为9%时,共炭化改性的煤沥青其流变曲线与热固性树脂U型曲线相似;根据DTG曲线可以把PF共炭化改性煤沥青的主要热解过程分为两个阶段,由Kissinger法计算得到其活化能和反应级数分别为248.06,15.69kJ·mol^(-1)和1.11、1.14。
A medium temperature coal tar pitch （CTP） used as C/C composite precursor was co-carbonized with a phenolic resin（PF） in the presence of p-toluene sulfuric （PTS）, and the pyrolysis mechanism of the modified CTP was also studied. The rheological behaviors of the raw CTP and the modified CTP were investigated using viscosimeter. Thermal analysis （TG-DTG） is employed to study the pyrolysis behavior of the CTP before and after modification. The pyrolysis kinetic parameters are calculated. The results show that the coal tar pitch generates demethylation reaction with PF in the existence of PTS. Moreover,the rheological curve of modified CTP is similar to that of thermosetting resin when the content of PF is as much as 9%. The main pyrolysis process of modified CTP can be divided into two stages according to the DTG curves. Both the activation energy and reaction order for the two reactions are 248.06 k J·mol-1, 1.11 and 15.69 k J·mol-1, 1.14, respectively, calculated by Kissinger method.
出处
《炭素技术》
CAS
北大核心
2017年第1期28-31,共4页
Carbon Techniques
关键词
煤沥青
酚醛树脂
共炭化
改性
C/C复合材料
Coal tar pitch
phenolic resin
co-carbonization
modification
C/C composites
