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| 1 | 非等温DSC法研究环氧树脂/聚硫醇体系固化动力学显示文摘采用实时红外光谱(Real-Time FTIR)和非等温DSC法研究了促进剂2,4,6-三(二甲胺基甲基)苯酚(DMP-30),N,N-二甲基苄胺(BDMA)和三乙胺(TEA)对环氧树脂/聚硫醇体系固化的影响。利用n级模型和Malek法对体系DSC曲线进行分析,计算树脂体系的反应动力学参数。结果表明,DMP-30的催化效率高于BDMA和TEA。25℃下质量分数5%的DMP-30对环氧树脂/聚硫醇体系的促进作用最明显,20 min内环氧基的转化率达到85.2%。加入促进剂后的环氧树脂/聚硫醇体系可用双参数自催化模型来拟合,反应级数m,n分别为0.297和1.276,活化能为37.344 k J/mol。 | 陈权 艾娇艳 蓝承东 柳晨醒 | 2015 | 热固性树脂2015，30，2： | 5 |
| 2 | Staged reaction kinetics and characteristics of iron oxide direct reduction by carbon显示文摘Staged reduction kinetics and characteristics of iron oxide direct reduction by carbon were studied in this work. The characteristics were investigated by simultaneous thermogravimetric analysis, X-ray diffraction(XRD), and quadrupole mass spectrometry. The kinetics parameters of the reduction stages were obtained by isoconversional(model-free) methods. Three stages in the reduction are Fe_2O_3→Fe_3O_4, Fe_3O_4→Fe O, and Fe O→Fe, which start at 912 K, 1255 K, and 1397 K, respectively. The CO content in the evolved gas is lower than the CO_2 content in the Fe_2O_3→Fe_3O_4 stage but is substantially greater than the CO2 contents in the Fe_3O_4→Fe O and Fe O→Fe stages, where gasification starts at approximately 1205 K. The activation energy(E) of the three stages are 126–309 k J/mol, 628 k J/mol, and 648 k J/mol, respectively. The restrictive step of the total reduction is Fe O→Fe. If the rate of the total reduction is to be improved, the rate of the Fe O→Fe reduction should be improved first. The activation energy of the first stage is much lower than those of the latter two stages because of carbon gasification. Carbon gasification and FexOy reduction by CO, which are the restrictive step in the last two stages, require further study. | Ru-fei Wei Da-qiang Cang Ling-ling Zhang Yuan-yuan Bai | 2015 | International Journal of Minerals,Metallurgy and Materials2015，22，10： | 3 |
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