聚硫密封剂硫化过程动力学研究
采用DSC法和黏度法研究聚硫密封剂室温硫化过程中的反应动力学。在20~40℃,通过非等温和等温DSC实验测量密封剂硫化反应热,得到硫化反应程度和反应速率,经非线性拟合获得了活化能参数、具温度依赖的反应速率常数和反应级数,建立了改进的Kamal动力学模型方程,方程曲线与实验点相吻合,表明密封剂在硫化反应初期（硫化程度α〈0.4）具有自催化反应特征,而在后期（α〉0.4）受扩散控制。测定了硫化过程中的黏度变化,其与硫化温度和硫化反应程度有关,拟合得到的黏温方程曲线在20~30℃,α〈0.4时与实验数据相吻合。...
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| Published in | 材料工程 Vol. 43; no. 7; pp. 43 - 47 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
安徽大学化学化工学院安徽省绿色高分子重点实验室,合肥,230039
2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-4381 1001-4381 |
| DOI | 10.11868/j.issn.1001-4381.2015.07.008 |
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| Summary: | 采用DSC法和黏度法研究聚硫密封剂室温硫化过程中的反应动力学。在20~40℃,通过非等温和等温DSC实验测量密封剂硫化反应热,得到硫化反应程度和反应速率,经非线性拟合获得了活化能参数、具温度依赖的反应速率常数和反应级数,建立了改进的Kamal动力学模型方程,方程曲线与实验点相吻合,表明密封剂在硫化反应初期（硫化程度α〈0.4）具有自催化反应特征,而在后期（α〉0.4）受扩散控制。测定了硫化过程中的黏度变化,其与硫化温度和硫化反应程度有关,拟合得到的黏温方程曲线在20~30℃,α〈0.4时与实验数据相吻合。 |
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| Bibliography: | WU Ming-yuan, ZHANG Jian-an, YANG Jian-jun, WU Qing-yun （Key Laboratory of Environmentally Chemistry and Chemical Engineering, A Polymer of Anhui Province, School of ui University, Hefei 230039, China） 11-1800/TB The curing kinetics during vulcanization of polysulfide sealant was investigated using both Differential Scanning Calorimetric method and viscometric method.The heat of curing reaction during vulcanization was measured over the temperature range of 20-40℃ by the non-isothermal and isothermal DSC,the degree of cure and the rate of cure were determined using the data generated by DSC.The activation energy,reaction rate constant and reaction order with on the temperature dependence were obtained by nonlinear fitting method,and the curing kinetics of polysulfide sealant was described subsequently by a modified Kamal kinetic model.Predictions of the rate of cure and the degree of cure by the modified Kamal model agreed with the experimental data.The results indicate the autocatalytic effect in preliminary s |
| ISSN: | 1001-4381 1001-4381 |
| DOI: | 10.11868/j.issn.1001-4381.2015.07.008 |