多壁碳纳米管增强环氧胶粘剂的性能  

Properties of multi-walled carbon nanotubes reinforced epoxy adhesive

作　　者：王静[1] 严福金 WANG Jing;YAN Fu-jin(School of Textile Science and Engineering,Tiangong University,Tianjing 300387,China;Shanghai Institute of Ce-ramics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387 [2]中科院上海硅酸盐研究所,上海201800

出　　处：《天津工业大学学报》2023年第1期22-28,共7页Journal of Tiangong University

基　　金：科技部重点研发项目(2019YFC0311800)。

摘　　要：为了充分发挥陶瓷材料抗压性能好和碳纤维材料高比刚、高比强、耐冲击性能好等优点,实现两者稳定、高效的连接,采用多壁碳纳米管(MWCNTs)对环氧胶粘剂进行增强改性,探讨了MWCNTs添加量以及胶层厚度对CFRP-陶瓷接头剪切强度和断裂模式的影响。3D轮廓仪、旋转流变仪、综合热分析仪及胶接接头力学性能测试结果表明:MWCNTs提高了CFRP-陶瓷接头的剪切强度,当MWCNTs质量分数为1.00%、胶层厚度为0.5 mm时,接头剪切强度达到最大值20.01 MPa,提高了19.96%;同时,不同胶层厚度的CFRP-陶瓷接头经历不同的失效阶段,胶层厚度为0.5 mm,表现在搭接区端部胶层开裂,胶层厚度超过1.0 mm,表现在搭接区端部胶层开裂逐渐向胶层内部断裂过渡;在此最优含量下,改性后环氧胶粘剂固化反应速率最大、热分解温度最高、热稳定性最佳,热分解残余剩余率提高了9.57%,但是,纳米颗粒的增强效果与其团聚性能相关,随着纳米颗粒含量增加,改性效果反而降低。In order to give full play to the good compression resistance of ceramic materials and the high specific stiffness,high specific strength and good impact resistance of carbon fiber materials and realize the stable and efficient connection between the two materials,multi-walled carbon nanotubes(MWCNTs)was used to reinforce and modify epoxy adhesive,and effect of the thickness of an adhesive layer and the auount of MWCNTs added on the shear strength and fracture mode of a CFRP-ceramic joint was studied.The test results of a 3D profilometer,a rotary rheometer,a comprehensive thermal analyzer,and the mechanical properties of the adhesive bonding joint showed that the MWCNTs could improve the shear strength of the CFRP-ceramic joint.When the mass fraction of the MWCNTs was 1.00%and the thickness of the adhesive layer was 0.5 mm,the shear strength of the joint reached its maximum at 20.01 MPa,showing a 19.96%increase.Also,after CFRP-ceramic joints with different thicknesses went through different failure stages,it was found that the 0.5 mm adhesive layer cracked at the end of the lap zone,while adhesive layers that are thicker than 1.0 mm cracked gradually from the end of the lap zones to the internal fractures of the adhesive layers.Under this optimal content,the modified epoxy adhesive demonstrates the highest curing reaction rate,the highest thermal decomposition temperature,and the best thermal stability,resulting in a 9.57%increase in the residual rate of thermal decomposition.However,the enhancement effect of nanoparticles is related to their agglomerative properties,and the modification effect decreases with the increase of nanoparticle content.

关 键 词：环氧胶粘剂 多壁碳纳米管(MWCNTs) 碳纤维增强复合材料 陶瓷增强复合材料 胶接 

分 类 号：TB332[一般工业技术—材料科学与工程]