Thermal Stability and Degradation Kinetics of Poly(Methyl Methacrylate)/Sepiolite Nanocomposites by Direct Melt Compounding
Thermal Stability and Degradation Kinetics of Poly(Methyl Methacrylate)/Sepiolite Nanocomposites by Direct Melt Compounding
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直接熔融共混聚甲基丙烯酸甲酯/海泡石纳米复合材料的热稳定性和降解动力学
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Jianqi Wang
中科院分区：
文献类型：
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作者：
N. Huang;Zhijun Chen;Hao Liu;Jianqi Wang
采用双螺杆挤出机，采用吸附法对海泡石进行氢化三甲基脂胺改性，制备了聚甲基丙烯酸甲酯（PMMA）纳米复合材料。采用x射线衍射仪（XRD）和透射电镜（TEM）对海泡石在PMMA中的形态和分散进行了表征。采用热重分析/差热重分析（TGA/DTG）对其热稳定性和活化能进行了研究。XRD和TEM结果表明，海泡石在纳米尺度上均匀地分散在PMMA基体中。TGA分析表明，海泡石的加入提高了PMMA的热稳定性。采用Flynn-Wall-Ozawa法计算了四种不同加热速率下的表观活化能，结果表明，与参考PMMA样品相比，海泡石在0.35 ~ 0.9的转化率范围内提高了约20 kJ/mol的表观活化能。
Poly(methyl methacrylate) (PMMA) nanocomposites based on sepiolite modified with trimethyl hydrogenated tallow amine by an adsorption process were prepared by melt compounding using a corotating twin screw extruder. The morphology and dispersion of sepiolite in the PMMA were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Thermal stability and the activation energies were investigated by thermogravimetric analysis/differential thermogravimetric (TGA/DTG). The XRD and TEM results show that the sepiolite was dispersed homogeneously in the PMMA matrix at a nanometer scale. The TGA analysis revealed that the addition of sepiolite improved the thermal stability of PMMA. The apparent activation energies were calculated by the method of Flynn–Wall–Ozawa in nitrogen at four different heating rates, showing that sepiolite increased the apparent activation energies by about 20 kJ/mol within the degree of conversion (α) of 0.35–0.9, as compared with the reference PMMA sample.