Ammonium carnallite was synthesized by using MgCl2 and NH4Cl,which obtained by the saline lake bischofite and filtrate stock of deposit magnesium by ammonia respectively,at molar ratio of 1:1.Then the ammonium carnall...Ammonium carnallite was synthesized by using MgCl2 and NH4Cl,which obtained by the saline lake bischofite and filtrate stock of deposit magnesium by ammonia respectively,at molar ratio of 1:1.Then the ammonium carnallite had been dehydrated to some extent at 160℃ for 4h.The dehydrated ammonium carnallite was dissolved in methanol under low temperature by feeding ammonia,preparing ammoniation magnesium chloride.The kinetics of non-isothermal decomposition was studied for ammoniation magnesium chloride.The process of ammoniation magnesium chloride to eliminate ammonia in the temperature range 78～246℃ can be described by the model of Ginstling-Brounshtein {f(α)=1.5[(1-α)-1/3-1]-1,g(α)=(1-2α/3)-(1-α)2/3}.The kinetic equation is dα/dt= 1.5Ae-E/RT [(1-α)-1/3-1]-1.The processes of ammoniation magnesium chloride to eliminate ammonia within 246～299℃ can be described by the model of Zhuralev,Lesoki and Tempelman {f(α)= 1.5(1-α)4/3[(1-α)-1/3-1]-1,g(α)= [(1-α)-1/3-1]2}.The kinetic equation is dα/dt= 1.5Ae-E/RT(1-α)4/3[(1-α)-1/3-1]-1.The kinetics equations and parameters provided valuable data for ammonition magnesium chloride to produced anhydrous magnesium chloride.展开更多
运用TG-DTG技术研究了炔丙基改性酚醛树脂聚合物的非等温热分解过程,通过Kissinger法和FWO法获得聚合物分解的动力学参数,利用模型拟合法推测该聚合物的热分解机理,并用非模型拟合法对机理进行了验证。实验结果表明,该聚合物的Td5分解...运用TG-DTG技术研究了炔丙基改性酚醛树脂聚合物的非等温热分解过程,通过Kissinger法和FWO法获得聚合物分解的动力学参数,利用模型拟合法推测该聚合物的热分解机理,并用非模型拟合法对机理进行了验证。实验结果表明,该聚合物的Td5分解温度在390℃左右,800℃时残炭率在30%左右。7种动力学分析方法显示聚合物的热分解活化能为92.95 k J/mol,指前因子lgA=4.71 s-1,n=2,分解符合二维扩散机理,对应的机理微分函数f(α)=(1-α)1/2[1-(1-α)1/2]-1积分函数g(α)=[1-(1-α)1/2]2聚合物的热分解反应方程为dα/dT=(5.14×104/β)exp(-92.95×103/RT)×(1-α)1/2×[1-(1-α)展开更多
文摘Ammonium carnallite was synthesized by using MgCl2 and NH4Cl,which obtained by the saline lake bischofite and filtrate stock of deposit magnesium by ammonia respectively,at molar ratio of 1:1.Then the ammonium carnallite had been dehydrated to some extent at 160℃ for 4h.The dehydrated ammonium carnallite was dissolved in methanol under low temperature by feeding ammonia,preparing ammoniation magnesium chloride.The kinetics of non-isothermal decomposition was studied for ammoniation magnesium chloride.The process of ammoniation magnesium chloride to eliminate ammonia in the temperature range 78～246℃ can be described by the model of Ginstling-Brounshtein {f(α)=1.5[(1-α)-1/3-1]-1,g(α)=(1-2α/3)-(1-α)2/3}.The kinetic equation is dα/dt= 1.5Ae-E/RT [(1-α)-1/3-1]-1.The processes of ammoniation magnesium chloride to eliminate ammonia within 246～299℃ can be described by the model of Zhuralev,Lesoki and Tempelman {f(α)= 1.5(1-α)4/3[(1-α)-1/3-1]-1,g(α)= [(1-α)-1/3-1]2}.The kinetic equation is dα/dt= 1.5Ae-E/RT(1-α)4/3[(1-α)-1/3-1]-1.The kinetics equations and parameters provided valuable data for ammonition magnesium chloride to produced anhydrous magnesium chloride.
文摘运用TG-DTG技术研究了炔丙基改性酚醛树脂聚合物的非等温热分解过程,通过Kissinger法和FWO法获得聚合物分解的动力学参数,利用模型拟合法推测该聚合物的热分解机理,并用非模型拟合法对机理进行了验证。实验结果表明,该聚合物的Td5分解温度在390℃左右,800℃时残炭率在30%左右。7种动力学分析方法显示聚合物的热分解活化能为92.95 k J/mol,指前因子lgA=4.71 s-1,n=2,分解符合二维扩散机理,对应的机理微分函数f(α)=(1-α)1/2[1-(1-α)1/2]-1积分函数g(α)=[1-(1-α)1/2]2聚合物的热分解反应方程为dα/dT=(5.14×104/β)exp(-92.95×103/RT)×(1-α)1/2×[1-(1-α)
文摘为提高2,6-二氨基-3,5-二硝基吡啶^(-1)-氧化物(ANPyO)Pb(Ⅱ)(Pb-ANPyO)含能配合物能量水平,获得安全性能和热分解特性参数。以ANPy O和醋酸铅为原料,N,N-二甲基甲酰胺(DMF)为溶剂,合成了ANPy OPb(Ⅱ)含能配合物。采用红外光谱(FTIR),元素分析和X射线光电子能谱分析(XPS)表征其结构,测试了其撞击感度和摩擦感度,采用差热分析-热重法(DSC-TG)研究其在不同升温速率下的热分解行为,利用Kissinger公式,Ozawa公式,热力学关系式和Zhang-Hu-Xie-Li公式分别计算了配合物热分解反应的表观活化能和热力学参数,以及配合物的热安全性参数。结果表明,配合物分子式为Pb(C5H3N5O5),特性落高和摩擦感度分别为238 cm和0。配合物在25~500℃范围内的热分解过程由一个吸热熔融峰和一个分解放热峰组成,相应峰温分别为265.0℃和332.6℃。用Kissinger法和Ozawa法所得配合物放热分解反应的活化能分别为202.42 k J·mol^(-1)和197.40 k J·mol^(-1),放热分解反应的活化熵,活化焓和活化自由能分别为149.5 J·mol^(-1)·K^(-1),197.7 k J·mol^(-1),112.1 kJ·mol^(-1),热爆炸临界温度和自加速分解温度分别为586.6 K和572.4 K。
