Silane modification on mesoporous silica coated carbon nanotubes for improving compatibility and dispersity in epoxy matrices |
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Affiliation: | 1. Department of Machine Intelligence and Systems Engineering, Faculty of Systems Engineering, Akita Prefectural University, Akita 015-0055, Japan;2. College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China;3. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No.92 West Dazhi Street, Nangang District, Harbin 150001, China;1. Energy & Environment Division, Korea Institute of Ceramic Engineering and Technology, JinJu 52851, Republic of Korea;2. Faculty of Mechanical Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet, Bac Tu Liem, Hanoi, Vietnam;3. Convergence R & D Division, Korea Institute of Ceramic Engineering and Technology, JinJu 52851, Republic of Korea |
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Abstract: | A simple synthetic method for placing a mesoporous silica coating on multi-wall carbon nanotubes (CNTs@MS) was developed to improve the surface compatibility with regard to a polar epoxy matrix. In addition, the mesoporous silica shell with silanol groups on the CNTs provides a platform to attach silane molecules (e.g. 3-glycidoxypropyltrimethoxysilane, GPTMS) that enable the CNTs@MS to be incorporated into the epoxy matrix at a content of up to 20 wt.%. The viscosities of the CNTs@MS- and GPTMS-modified-CNTs@MS–epoxy composites are much lower than that of the CNTs–epoxy, and then the voids in the GPTMS-modified-CNTs@MS–epoxy composites are most significantly reduced. The effects of the CNTs@MS and GPTMS-modified CNTs@MS on the mechanical and thermal properties of the epoxy composite are investigated. The results show that the GPTMS-modified CNTs@MS improved the filler–epoxy matrix interaction, and has better compatibility in epoxy than the CNTs@MS. As the surface compatibility and interaction strength increase in the epoxy matrix, the enhancement in storage modulus, thermal conductivity and reduction in the coefficient of thermal expansion are in the following order: GPTMS-modified CNTs@MS > CNTs@MS ≫ CNTs. |
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Keywords: | A Polymer-matrix composites (PMCs) B Thermal properties B Mechanical properties Carbon nanotubes |
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