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OALib Journal期刊
ISSN: 2333-9721
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含硅芳二胺固化环氧树脂的反应动力学研究
DOI: 10.11777/j.issn1000-3304.2015.15043, PP. 1143-1150
Keywords: 二胺基二硅氧烷,合成,环氧树脂,固化动力学
Abstract:
合成了2种含硅二胺单体3,3'-(1,3-二甲基-1,3-二乙烯基-1,3-二硅氧烷)二苯胺(S1)和4,4'-(1,3-二甲基-1,3-二乙烯基-1,3-二硅氧烷)二苯胺(S2),并对其作为环氧树脂的新型固化剂进行了研究.采用非等温示差扫描量热技术(DSC)研究了其与双酚A型环氧树脂E51体系的固化反应动力学,根据不同升温速率下E51/S1和E51/S2体系的特征温度的变化,分别确定了该两体系的固化反应工艺条件,即E51/S1体系为100℃/1h+160℃/2h+190℃/3h;E51/S2体系为110℃/1h+170℃/2h+190℃/3h.通过Kissinger方程、Crane方程以及Arrheninus方程对固化反应进行了固化动力学行为研究,得到了两个反应体系的表观活化能ΔE、Arrhenius因子A以及反应级数n等动力学参数.E51/S1体系的ΔE为50.65kJ/mol、A为1.83×105,n为0.87;E51/S2体系的ΔE为51.39kJ/mol,A为1.44×105,n为0.87,由ΔE和A表明,E51和S2的反应活性高于E51和S1的反应活性,即,氨基位于苯环的间位时与环氧基团更容易反应.二者的反应级数相同并且小于1,说明E51与S1和S2之间的反应是复杂反应.在动力学参数的基础上,得到了n级固化动力学模型.
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