表面氨基链修饰氧化石墨烯对DGEBA/3,3'-DDS环氧树脂涂层力学性能影响的研究  

Study on Effect of Surface Amino Chain Modified Graphene Oxide on Mechanical Properties of DGEBA/3,3'-DDS Epoxy Resin

作　　者：孙伟松 于思荣 徐坤山 刘林 张凯 夏渊 Sun Weisong;Yu Sirong;Xu Kunshan;Liu Lin;Zhang Kai;Xia Yuan(School of Materials Science and Engineering,China University of Petroleum,Qingdao,Shandong 266580,China;Zibo Institute of Special Equipment Inspection,Zibo,Shandong 255000,China;School of Chemistry and Chemical Engineering,Yantai University,Yantai,Shandong 264000,China;CNOOC Changzhou Paint&Coatings Industry Research Institute Co.,Ltd.,Changzhou,Jiangsu 213016,China)

机构地区：[1]中国石油大学(华东)材料科学与工程学院,青岛266580 [2]淄博市特种设备检验研究院,淄博255000 [3]烟台大学化学化工学院,烟台264000 [4]中海油常州涂料化工研究院有限公司,江苏常州213016

出　　处：《涂层与防护》2021年第11期38-38,39-47,58,共11页Coating and Protection

基　　金：国家自然科学基金项目(21805170)。

摘　　要：采用分子动力学模拟与实验测试相结合的方法对不同表面结构石墨烯改性的DGEBA/3,3’-DDS环氧树脂涂层性能进行研究。首先利用Materials Studio 2019软件建立了不同类型的环氧树脂复合材料模型,模拟不同温度下复合材料体系的内聚能密度、力学性能和形变的变化规律,确定力学性能最佳的复合材料体系。然后借助扫描电镜和力学性能测试手段对纯环氧树脂与表面氨基修饰氧化石墨烯(NH-GO)/环氧树脂涂层进行表面形貌及力学性能测试。结果表明,环氧树脂体系随着石墨烯组分的掺杂,内聚能密度和力学性能均得到了有效提高,随着体系温度的升高,其数值均呈现下降趋势。当温度为200K、掺杂了NH-GO的复合材料体系的力学性能最佳,内聚能密度最大为4.394×10^(8)J·m^(-3)。4种复合材料体系形变量随着体系温度的升高都是增大的,在低温条件下(T<350 K)呈现压缩状态,在高温条件下(T>350 K)呈现膨胀状态,NH-GO的掺杂可有效改善环氧树脂涂层在高温下易形变的不足,可使环氧树脂涂层的表面更加平整和致密,颗粒尺寸更加均匀。相比纯环氧树脂涂层,力学性能均得到了明显提升。以NH-GO作为增强相对DGEBA/3,3’-DDS环氧树脂进行改性可有效提高涂层的力学性能。The properties of DGEBA/3,3‘-DDS epoxy resin coatings modified by graphene with different surface structures were studied by molecular dynamics simulation and experimental tests.Firstly,the different models of composites were established by Materials Studio 2019 software.Based on molecular dynamics simulation,the variation rules of cohesive energy density,mechanical properties and deformation quantity of the composite system under different temperature were studied to determine the composite system with the best mechanical properties.Secondly,the sur face morphology and mechanical properties of the pure epoxy resin and amino modified GO/epoxy resin coating were tested by means of scanning electron microscopy and mechanical properties testing.The results show that the cohesive energy density and mechanical properties of epoxy resin system are effectively improved with the graphene components doped.With the system temperature increased,the values show a decreasing trend.When the temperature is 200K,the mechanical properties of the NH-GO/epoxy resin composite system are the best,and the maximum value of cohesive energy density is 4.394×10^(8)J·m^(-3).The deformation quantity of the four composites increased with the increase of system temperature.They are in the compression state at low temperature(T<350 K)and in the expansion state at high temperature(T>350 K).The deformation of epoxy resin materials doped the surface amino modified GO are decreased effectively at high temperature.The surface of epoxy resin coating modified by NH-GO is more smooth and compact,and the particle size is more uniform.The mechanical properties of the DGEBA/3,3'-DDS epoxy resin coating can be effectively improved by doping the reinforcing GO modified by surface amino group.

关 键 词：环氧树脂 氧化石墨烯 力学性能 分子动力学模拟 内聚能密度 

分 类 号：TQ630[化学工程—精细化工]