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应用 DSC、热重分析技术对共沉淀和机械混合 Cu C2 O4 - Zn C2 O4 · 2 H2 O(摩尔比 1∶ 1)在 N2 气氛中的热行为、热分解过程和热分解动力学进行了研究 ,DSC和 TG曲线表明 ,机械混合样品的热分解过程与单独的草酸盐基本一致 ,共沉淀样品的热分解过程则不同于单独的草酸盐 .用 KAS的等转化率法求出较为可靠的活化能 Ea,用热分析动力学三因子求算的比较法确定了 2种样品热分解反应遵循的机理函数 f (α) ,在 Ea 和 f (α)的基础上计算出指前因子 A.共沉淀样品中第 2步、第 3步热分解反应遵循的机理函数分别为 R2 和 A2 .机械混合样品中第 2步、第3步热分解反应遵循的机理函数分别为 2 D和 A2
The thermal behavior, thermal decomposition and thermal decomposition kinetics of coprecipitated and mechanically mixed Cu C2 O4 - Zn C2 O4 · 2 H2 O (molar ratio 1: 1) were investigated by DSC and TGA in N2 atmosphere , The DSC and TG curves show that the thermal decomposition process of the mechanically mixed sample is basically the same as that of the oxalate alone and the thermal decomposition of the coprecipitated sample is different from that of the oxalate alone. The activation energy Ea of the two samples was determined by the comparison of the three factors of thermal analysis kinetics. The mechanism function f (α) followed by the thermal decomposition reaction of the two samples was determined. Based on the Ea and f (α), the pre-exponential factor A . The coprecipitation samples in the second step, the third step of the thermal decomposition reaction to follow the mechanism function R2 and A2 respectively.Machine mixed samples in step 2, step 3 to follow the thermal decomposition reaction mechanism for 2 D and A2