纳米材料胶粘剂胶体拉伸性能与微观结构  

Tensile properties and the microstructure of a kind of nanomaterial adhesive

作　　者：李传习[1] 高有为 李游[1] 刘宇飞 LI Chuan-xi;GAO You-wei;LI You;LIU Yu-fei(Key Laboratory of Bridge Engineering Safety Control by Department of Education,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学桥梁工程安全控制教育部重点实验室,湖南长沙410114

出　　处：《交通科学与工程》2020年第2期45-51,共7页Journal of Transport Science and Engineering

摘　　要：为制备出常温固化的环氧树脂结构胶粘剂,通过超声波细胞粉碎仪对羧基功能化碳纳米管(TNMC1)、羟基功能化碳纳米管(TNMH1)和氧化石墨烯(TNGO-10)3种纳米材料分别进行分散处理,制备了纳米材料增强环氧胶粘剂,测试了胶粘剂常温固化胶体的拉伸曲线。利用扫描电子显微镜,获取了拉伸断面形貌,分析了掺入纳米材料后的增强增韧机制。研究结果表明:掺入微量的纳米材料能显著提高胶粘剂的拉伸性能。当TNGO-10掺量为0.1%时,加入了TNGO-10的胶粘剂的拉伸强度达到最大,较纯胶粘剂提高了42.64%;当分别加入TNMC1和TNMH1掺量为0.2%时,相应胶粘剂的拉伸强度达到最大,分别较纯胶粘剂提升了55.32%,38.08%;同时加入为0.05%的TNMH1和0.05%的TNGO-10时,其拉伸强度、断裂伸长率及弹性模量较纯胶粘剂分别提高了56.41%,43.67%和19.5%,充分发挥了一维和二维2种纳米材料的协同效应。胶体拉伸断面SEM分析表明,TNMC1,TNMH1和TNGO-10的掺入能提高其断面的粗糙度,表面活性化的纳米材料与胶粘剂形成了紧密结合的界面,导致纳米材料周围的基体具有更明显的塑性变形。裂纹在遇到纳米材料时,需要绕过或者剪断纳米材料方能扩展,形成了二级裂纹,消耗了更多的断裂能。加入纳米材料后,胶粘剂拉伸试件的断裂形式由脆性断裂转变为韧性断裂,材料的强度与韧性显著提高。In order to make an efficient epoxy resin adhesive that solidifies in room temperature,three kinds of nanomaterials named carboxyl functionalized carbon nanotubes(TNMC1),hydroxyl(TNMH1)functionalized carbon nanotubes and graphene oxide(TNGO-10)were dispersed by ultrasonic cell pulverizer to make the nanomaterial reinforced epoxy adhesive.The tensile property of the normal temperature curing colloid was tested,the fracture surface of the tensile profile was captured by the Scanning Electron Microscope(SME),and the tougheningand strengthening mechanisms by adding nanomaterials were disclosed.It is concluded that the tensile property of the adhesive can be improved significantly by adding nanomaterials.When the mass fraction of TNGO-10 is 0.1%,the tensile strength of the adhesive added with nanomaterial TNGO-10 reaches the maximum,which is 42.64%higher than that of pure adhesive.When TNMC1 and TNMH1 with a mass fraction of 0.2%are added,the tensile strength of the corresponding adhesives reaches the maximum,which are enhanced by 55.32%and 38.08%respectively.When TNMH1 and TNGO-10 with mass fraction of 0.05%are added,their tensile strength,elongation at break and elastic modulus are increased by 56.41%,43.67%and 19.5%respectively.Those results indicate that the synergistic effect of one-dimensional and two-dimensional nanomaterials is brought into full play.The SEM analysis of colloidal tensile section shows that the roughness of the section is improved by the addition of TNMC1,TNMH1 and TNGO-10,in which the surface activated nanomaterials formed a tight interface with the adhesive,resulting in the increase of the obvious plastic deformation capacity of the matrix around the nanomaterials.Cracking propagation is restricted by nanomaterial,the secondary crack should either bypass or shear the nanomaterial,consuming fracture energy.When the nanomaterial is added,the fracture pattern of adhesive colloidal tensile specimen will change from brittle fracture to ductile fracture,and the strength and toughness of the materia

关 键 词：环氧胶粘剂 纳米材料 拉伸性能 微观结构 常温固化 

分 类 号：TQ433.3[化学工程]