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Thermal stability and degradation kinetics of poly(methyl methacrylate)/layered copper hydroxy methacrylate composites

机译：聚（甲基丙烯酸甲酯）/层状甲基丙烯酸羟铜复合材料的热稳定性和降解动力学

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摘要

Poly(methyl methacrylate) (PMMA)/copper hydroxy methacrylate (CHM) composites were prepared via solution blending and bulk polymerization. Addition of 3% by weight of the CHM additive using solution blending resulted in a significant increment (～45℃) in thermogravimetric analysis (TGA) T{sub}50, the temperature at which 50% of the original polymeric mass is lost. The value T{sub}50 increased by 30℃ for a PMMA composite with 4% CHM, synthesized via bulk polymerization. Activation energies, E{sub}a, were calculated as a function of conversion fractions (TGA decomposition profile) for the polymeric materials. Analysis of multiple heating rate data using the Flynn-Wall-Ozawa method resulted in E{sub}a values that were 50 kJ moL{sup}(-1) higher for conversions above 0.5 in the solution blended composite compared to a reference sample of pure PMMA recrystallized from the same solvent. Similar results were obtained for bulk polymerization process with differences in E{sub}a values>30kJmol{sup}(-1) relative to pure PMMA. However, in contrast to previous studies of bulk polymerized samples, the solution-blended composite exhibited no improvement in cone calorimetry determination of total heat release as compared with the reference PMMA sample.
机译：通过溶液共混和本体聚合制备了聚甲基丙烯酸甲酯（PMMA）/甲基丙烯酸铜羟基酯（CHM）复合材料。使用溶液共混添加3％重量的CHM添加剂会导致热重分析（TGA）T {sub} 50显着升高（约45℃），该温度下原始聚合物质量损失了50％。通过本体聚合合成的具有4％CHM的PMMA复合材料，T {sub} 50值增加了30℃。计算活化能E {a}作为聚合物材料的转化率（TGA分解曲线）的函数。使用Flynn-Wall-Ozawa方法分析多种加热速率数据时，溶液混合复合材料中的转化率高于0.5的E {sub} a值比参考样品的E {sub} a高50 kJ moL {sup}（-1）。用相同的溶剂重结晶纯PMMA。对于本体聚合过程，获得了相似的结果，相对于纯PMMA，E {a} a值> 30kJmol {sup}（-1）。但是，与先前对本体聚合样品的研究相比，与参考PMMA样品相比，溶液共混复合材料的锥体量热法测定的总热量释放没有改善。

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