层离型PMMA/镁铁双氢氧化物纳米复合材料的热动力学  

Thermogravimetric Kinetic Analysis of Exfoliated Poly(Methyl Methacrylate)/MgFe-LDH Nanocomposites

作　　者：丁严艳[1] 徐亮[2] 胡更生[1] 

机构地区：[1]杭州电子科技大学新闻出版学院,浙江杭州310018 [2]浙江省消防总队金华支队浙江杭州310014

出　　处：《高分子材料科学与工程》2010年第9期84-88,共5页Polymer Materials Science & Engineering

摘　　要：通过原位聚合法制备了以聚甲基丙烯酸甲酯为基体,与镁铁双氢氧化物具有良好相容性的层离型纳米复合材料。实验结果表明,MgFe-LDH的引入显著提高了聚合物的热解温度,两者间的相互作用和片层的物理阻隔都起到了作用。采用Flynn-Wall-Ozawa和Friedman法对体系进行热动力学分析,两种计算结果相互验证,表明纳米复合材料的热解表观活化能较纯样明显增大,热分解过程受到阻碍。这种热稳定化作用不仅与片层的物理阻隔有关,也应当与热解反应的能量阻隔有关。The novel exfoliated nanocomposites （PMMA/MgFe（DS）-LDH） were synthesized by in situ polymerization based on poly（methyl methacrylate） and dodecyl sulfate-intercalated MgFe-layered double hydroxide （MgFe（DS）-LDH）. The thermal degradation mechanism was discussed by thermogravimetric analysis （TGA） and microscopic kinetic analysis. Flynn-Wall-Ozawa and Friedman equations were used to compute the weight loss data and calculate the activation energies of thermal decomposition. The participation of iron ion is found to play an important role in the improvement of thermal stability of nanocomposites with small inorganic loading and well-dispersed inorganic components. This sufficient dispersion was very helpful and important to the improvement in properties which verified by the change of Ea.

关 键 词：热降解 动力学分析 双氢氧化物 

分 类 号：TB383[一般工业技术—材料科学与工程]