氧化石墨烯的表面改性及其与环氧树脂的复合研究

发布时间：2018-05-20 15:44

本文选题：氧化石墨烯 + 环氧树脂　；参考：《湖南工业大学》2015年硕士论文

【摘要】：石墨烯独特的结构特点赋予其优异的力学和电学性能,可广泛的应用在许多高科技领域中。由于石墨烯(GN)呈化学惰性,易产生团聚,因此限制了其应用,功能化被认为是解决这一问题的有效途径。本研究采用改进Hummers氧化法制备氧化石墨,经超声剥离得到氧化石墨烯(GO),利用其表面的环氧基团,将双酚A(BPA)接枝到GO表面,实现对GO的表面功能化;然后将其与环氧树脂(EP)复合,制备GO/EP复合材料,研究改性前后GO对EP力学及热稳定性的影响。首先,采用传统Hummers法和改进后Hummers法制备GO,比较了两种方法对GO结构的影响,利用FT-IR、XRD和TG对两种GO进行表征,结果显示:改进法所制备的GO(用IGO表示)表面有更多的环氧基团,层间距更大,层数更低,且保存的石墨晶体结构更完好。其次,在上述工作的基础上,开展了在IGO表面接枝BPA(IGOBPA)的研究。为了防止IGO表面的酚羟基和羧基对后续工作的不利影响,我们先采用Na OH溶液对其进行了封端处理,得到封端IGO(用SIGO表示),然后在碱性条件下进行了BPA接枝GO的探索工作,FT-IR、XPS和SEM结果表明,BPA以共价键成功接枝到GO表面,XRD结果显示IGO-BPA以松散的方式堆砌在一起;分散性实验结果表明,IGO-BPA比IGO和SIGO在丙酮中分散效果更好。最后,采用溶液共混法制备了IGO/EP、SIGO/EP和IGO-BPA/EP复合材料,考察改性前后和不同含量GO对复合材料力学性能、热学性能的影响。结果表明:GO的加入提高了复合材料的力学性能、热稳定性,比较而言,以IGO-BPA的改性效果更佳,在其添加量为0.5wt%时,复合材料的综合力学性能最佳。
[Abstract]:Graphene has excellent mechanical and electrical properties due to its unique structural characteristics. It can be widely used in many fields of high technology. Because of its chemical inertia and agglomeration, GNN is limited in its application. Functionalization is considered to be an effective way to solve this problem. In this study, graphite oxide was prepared by modified Hummers oxidation method. Graphene oxide was obtained by ultrasonic stripping. Bisphenol A (BPA) was grafted onto go surface to realize surface functionalization of go, and then it was combined with epoxy resin (EP). The effects of go on the mechanical and thermal stability of GO/EP composites were studied before and after modification. Firstly, GO3 was prepared by the traditional Hummers method and the improved Hummers method. The effects of the two methods on go structure were compared. The two go were characterized by FT-IRX XRD and TG. The results showed that there were more epoxy groups on the surface of goo (expressed by IGO) prepared by the modified method. The interlayer spacing is larger, the number of layers is lower, and the preserved graphite crystal structure is better. Secondly, on the basis of the above work, the study of grafted BPA-IGO BPA on the surface of IGO was carried out. In order to prevent the adverse effects of phenolic hydroxyl and carboxyl groups on the surface of IGO, we first sealed them with NaOH solution. The investigation of BPA grafted go was carried out in alkaline condition. The results of FT-IRN XPS and SEM showed that IGO-BPA was successfully grafted to go surface by covalent bond. The results showed that IGO-BPA was stacked loosely. The results of dispersion experiments show that IGO-BPA is more effective than IGO and SIGO in dispersing in acetone. Finally, IGO / EPX SIGO / EP and IGO-BPA/EP composites were prepared by solution blending method. The effects of different contents of go on the mechanical and thermal properties of the composites were investigated. The results showed that the mechanical properties and thermal stability of the composites were improved with the addition of% go. The modification effect of IGO-BPA was better than that of the composites, and the comprehensive mechanical properties of the composites were the best when the content of IGO-BPA was 0.5 wt%.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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