含硅芳炔单体的流变性及聚合物热分解

Rheological property of silicon-containing arylacetylenes and thermal degradation of their polymers

借助流变仪研究了苯基三苯乙炔基硅烷(PTPES)、乙烯基三苯乙炔基硅烷(VTPES)、二苯基二苯乙炔基硅烷(BPBPES)3种单体及其聚合物(TSAR)的流变性能,并利用热分析技术分析了共聚物的反应动力学,建立了热分解机理函数。流变分析表明,3种单体加工窗口超过150℃,具有良好的加工性能;热重分析显示,800℃时聚合物残炭率在70%左右;8种动力学分析证实,聚合物热分解反应级数n=4,反应活化能E=131.2 k J/mol。

The rheologieal properties of phenyl （triphenylethynyl） silane （ PTPES ）, vinyl （triphenylethynyl） silane （ VTPES）, diphenyl（diphenylethynyl） silane（BPBPES） three monomers and their polymers （TSAR） were studied by rheometer. At the same time, the degradation reaction kinetics of TSAR was analyzed and the degradation mechanism was also proposed by kinetic theory. The results show that three monomers have an excellent processability with beyond 150 ℃ process window by rheological analysis. Char yield obtained by TG was about 70% at 800 ℃. The reaction order was 4 and reaction activation energy was E= 131.2 kJ/mol by 8 different kinetic analysis methods.