摘要 本论文采用基体树脂为环氧树脂，我们用氧化石墨烯（GO）和羟基化碳纳米管 对环氧树脂基体进行改性，采用 DSC——差示扫描量热仪对改性树脂的固化动力学 进行研究。研究内容如下：
首先，将已经制备好的氧化石墨烯均匀分散到到环氧树脂基体中。其次，先将羟 基化多壁碳纳米管(MWCNTs)、甲基六氢苯酐(MHHPA)和硫酸混合，经过高速搅拌、 超声震动，再加热催化，最后得到改性的催化剂。最后，环氧树脂的改性用氧化石墨 烯水溶液，固化剂的改性剂是羟基化碳纳米管。将上述第一步中的树脂和第二步中的 固化剂从分混合，加入促进剂，设置升温程序固化，最后得到改性树脂样品。采用非 等温 DSC 法对样品和纯环氧体系进行 DSC 扫描得到 DSC 曲线，再对 DSC 曲线进行 分析。78324
环氧体系的模型拟合法所需的活化能和指前因子先通过非模型拟合法(Friedman 法)得到，然后利用模型拟合法得到的固化动力学方程中的活化能 E 和指前因子 logA。 将 Friedman 法得到的 E 和 logA 作非线性拟合，作为回归计算的初始条件,就可以得 到未改性树脂体系的 n 级模型拟合动力学参数和改性后环氧树脂体系 Kamal 模型拟 合动力学参数。再对不同升温速率下的纯环氧树脂及改性树脂的固化起始温度、峰值 温度和终止温度值进行线性回归，通过外推的方法，便可以得到当升温速率降低到 0 时的对应温度，进而可以确定环氧树脂体系的最佳固化温度范围。最后将 DSC 实验 曲线和模型拟合计算得出的 DSC 曲线作对比，以验证反应模型的合理性。然后测试 纯环氧和改性树脂的等温固化动力学，并进行模型拟合，通过比较实验值和拟合值， 验证反应模型是否合理。
毕业论文关键词：环氧树脂；氧化石墨烯；碳纳米管；固化动力学
Abstract We used epoxy resin as the matrix in this paper。 In order to improve the strengh and toughness properties, graphene oxide(GO) and GO-MWCNTs(carbon nanotubes) were used to modify epoxy resin。 The the curing kinetics of GO-MWCNTs nano materials were studied by the differential scanning calorimetry(DSC)。 Here are the study results:
Firstly, the graphene oxides were extracted to the epoxy resin matrix via two-phase extraction methods。 Secondly ,we mixed the MWCNTs、the MHHPA、vitriol up。 After high-
speed stirring and ultrasonic dispersion ,the modified curing agent was successfully prepared through heat catalytic reaction。 Finally, in this paper,we use the graphene oxide to modify the epoxy resin and curing agent was modified by hydroxy carbon nanotubes。 The modified curing agent and the modified epoxy resin will be mixed and stirred。 Promoter—DMP-30 was added to get composite samples。 Scanning the sample and pure epoxy system by non- isothermal DSC method to get the DSC curve, then analyze the DSC curve。
First, use the model fitting method (Friedman method) to get activation energy and the former factor of the epoxy system which is needed for the model fitting。 Then using the curing kinetics equation which is obtained from the model fitting methods, E and logA of Friedman method will be served as the nonlinear fitting’s initial conditions of regression calculation, to get pure resin system n-tier model fitting kinetic parameters and modified epoxy system Kamal model fitting kinetic parameters。 Learning the starting temperature, peak temperature and ending temperature of different heating rate with linear regression analysis, extrapolating the initial curing temperature and peak temperature of the heating rate of 0, to determine the best scope of the curing temperature of epoxy resin system。 Finally compare the DSC experiment curves with the calculated DSC curve of model fitting and to verify the rationality of reaction model。 Then test the isothermal curing kinetics and model fitting of pure epoxy resin and nanocomposites。 And the fitting values were compared to the experimental value, which can verify the rationality of the reaction model。 氧化石墨烯/碳纳米管协同改性环氧树脂复合材料的固化行为的研究:http://www.youerw.com/cailiao/lunwen_90250.html