EXPERIMENTAL INVESTIGATION ON BONDING PROPERTY OF EPOXY ADHESIVE MODIFIED BY GRAPHENE AND MULTI-WALL CARBON NANOTUBES

Abstract

Abstract: To improve the bonding property and thermal property of epoxy adhesive, graphene and multi-wall carbon nanotubes (MWCNTs) were separately and proportionally (1∶1) added into the adhesive. Single-lap shear specimens of carbon fiber reinforced composite laminates were prepared for testing the shear strength of the unmodified adhesive and the modified adhesive. The fracture mechanism of modified adhesive layer was investigated using Scanning Electron Microscope (SEM). The effects of nano-materials on the thermal property of modified epoxy adhesive were studied using Thermo-gravimetric Analysis (TGA) and Differential Scanning Calorimeter (DSC). The results show that adding graphene and MWCNTs can improve the interfacial adhesion force of epoxy adhesive and the shear strength of single-lap joints. In addition, the modification has a synergistic effect, when 0.5wt% graphene and MWCNTs were added for hybrid modification, the shear strength of the single-lap joints is the strongest, increasing by 34.52%. At the optimum content, the decomposition temperature of the modified epoxy adhesive is also the highest, and thus the thermal stability is the best. However, the reinforcement of nano-materials at higher content tends to decrease due to their agglomeration. The DSC results show that the modification of graphene and MWCNTs does not affect the glass transition temperature of the epoxy adhesive.

Key words: epoxy adhesive, graphene, multi-wall carbon nanotubes, carbon fiber reinforced composite laminates, bonding

CLC Number:

TB332

HUANG Hai-xin, RAO Qiong, PENG Xiong-qi. EXPERIMENTAL INVESTIGATION ON BONDING PROPERTY OF EPOXY ADHESIVE MODIFIED BY GRAPHENE AND MULTI-WALL CARBON NANOTUBES[J]. Fiber Reinforced Plastics/Composites, 2019, 0(8): 42-46.

References

[1] 赵丽滨, 徐吉峰. 先进复合材料连接结构分析方法[M]. 北京: 北京航空航天大学出版社, 2015: 2-3.
[2] Schweizer M, Meinhard D, Ruck S, et al. Adhesive bonding of CFRP: a comparison of different surface pre-treatment strategies and their effect on the boing shear strength[J]. Journal of Adhesion Science & Technology, 2017, 1-11.
[3] Scarselli G, Corcione C, Nicassio F, et al. Adhesive joints with improved mechanical properties for aerospace applications[J]. International Journal of Adhesion and Adhesives, 2017, 75: 174-180.
[4] Correia S, Anes V, Reis L. Effect of surface treatment on adhesively bonded aluminium-aluminium joints regarding aeronautical structures[J]. Engineering Failure Analysis, 2018, 34-35.
[5] Akhavan-Safar A, Ayatollahi M R, Silva L F M D. Strength predic-tion of adhesively bonded single lap joints with different bondline
thicknesses: A critical longitudinal strain approach[J]. International Journal of Solids and Structures, 2017, 109: 189-198.
[6] Pham V H, Yong W H, Song H K, et al. Synthesis of epoxy encapsulated organoclay nanocomposite latex via phase inversion emulsification and its gas barrier property[J]. Journal of Industrial and Engineering Chemistry, 2014, 20(1): 108-112.
[7] Li Y, Badrinarayanan P, Kessler M R. Liquid crystalline epoxy resin based on biphenyl mesogen: Thermal characterization[J]. Polymer, 2013, 54(12): 3017-3025.
[8] Zhou Y X, Wu P X, Cheng Z Y, et al. Improvement in electrical, thermal and mechanical properties of epoxy by filling carbon nanotube[J]. Express Polymer Letters, 2008, 40-48.
[9] 沈小军, 孟令轩, 付绍云. 石墨烯-多壁碳纳米管协同增强环氧树脂复合材料的低温力学性能[J]. 复合材料学报, 2015, 32(1): 21-26.
[10] 叶国锐, 晏义伍, 曹海琳. 氧化石墨烯改性玄武岩纤维及其增强环氧树脂复合材料性能[J]. 复合材料学报, 2014, 31(6): 1402-1408.
[11] Gei A K, Novoselov K S. The rise of graphene[J]. Nature Materials, 2007, 6(3): 183-191.
[12] Han X, Zhao Y, Sun J M, et al. Effect of graphene oxide addition on the inter-laminar shear property of carbon fiber reinforced epoxy composites[J]. New Carbon Materials, 2017, 32(1): 48-55.
[13] Effects of carbon nanofiller functionalization and distribution on interlaminar-fracture toughness of multi-scale reinforced polymer composites[J]. Carbon, 2012, 50(3): 1316-1331.
[14] Cui H W, Li D S, Fan Q, et al. Electrical and mechanical properties of electrically conductive adhesives from epoxy, micro-silver flakes, and nano-hexagonal boron nitride par-ticles after humid and thermal aging[J]. International Journal of Adhesion & Adhesives, 2013, 44: 232-236.
[15] Kinloch A J, Lee J H, Taylor A C, et al. Toughening structural adhesives via nano-and micro-phase inclusions[J]. Journal of Adhesion, 2003, 79(8-9): 867-873.
[16] Chen C, Justice R S, Schaefer D W, et al. Highly dispersed nanosilica-epoxy resins with enhanced mechanical properties [J]. Polymer, 2008, 49(17): 3805-3815.
[17] 周宏, 朴明昕, 李芹, 等. 氧化石墨烯纳米片/环氧树脂复合材料的制备与性能[J]. 复合材料学报, 2015 , 32 (5): 1309-1315.
[18] Wang Z, Gu Z, Hong Y, et al. Bonding strength and water resistance of starch-based wood adhesive improved by silica nanoparticles[J]. Carbohydrate Polymers, 2011, 86(1): 72-76.
[19] Khan U, May P, Porwal H, et al. Improved adhesive strength and toughness of polyvinyl acetate glue on addi-tion of small quantities of graphene[J]. AcsAppl Mater Interfaces, 2013, 5(4): 1423-1428.