摘要
用热重分析(TGA)法研究了乙烯基笼型倍半硅氧烷(V-POSS)/聚丙烯纳米复合材料的热降解动力学。采用Kim-Park,Flynn-Wall-Ozawa和Friedman三种方法计算了共混物的降解反应活化能,结果说明,当V-POSS加入质量分数分别为4%、8%、12%和16%、升温速率为5℃/min时材料热降解起始温度分别提高了27.1℃、29.3℃、52.6℃和66.9℃,热降解反应活化能E_a提高了10 kJ/mol～50 kJ/mol,反应级数n也随V-POSS加入量增多有所提高,材料热稳定性得到了改善。
The polypropylene （PP） was modified by vinyl-polyhedrol oligomeric silsesquioxane （V-POSS）. The non-isothermal degradation processes of V-POSS/PP nanocomposites were investigated by thermogravimetry （TG） analysis. The activation energies Ea and reaction orders n were calculated by Kim-Park, Flynn-Wall-Ozawa and Friedman methods. The results show that the non-isothermal degradation of V-POSS/PP nanocomposites is one-stage degradation processes. When mass fraction of V-POSS is 4%, 8%, 12% and 16%, the thermal degradation temperatures increases 27.1 ℃, 29.3 ℃ 52.6℃ and 66.9 ℃ respectively, the thermal degradation Ea increases from 10 kJ/mol to 50 kJ/mol, and n also increases with increasing V-POSS content. It shows that V-POSS can increase heat stability of pure iPP.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2011年第6期106-109,共4页
Polymer Materials Science & Engineering
基金
河北省自然科学基金资助课题(E2007000204)
关键词
笼型聚倍半硅氧烷
聚丙烯
热重分析
降解动力学
silsesquioxane
polypropylene
thermogravimetric analysis
degradation kinetics
