Abstract
A study on the coefficient of thermal expansion (CTE) of single-wall carbon nanotube (SWCNT)-reinforced nanocomposites is presented in this paper. An interfacial adhesion factor (IAF) is introduced for the purpose of modelling the adhesion between SWCNTs and the matrix. The effective CTE and modulus of SWCNTs are derived using the IAF, and the effective CTE of the nanocomposite is derived by the Mori–Tanaka method. The developed model is validated against experimental data and good agreement is found.
Highlights
Since the discovery of multi-wall carbon nanotubes (MWCNTs) in 1991 by Iijima [1], and subsequent synthesis of single-wall carbon nanotubes (SWCNTs) [2,3], numerous experimental and theoretical studies have been carried out to investigate the electronic, chemical, and mechanical properties of CNTs
The very low aspect ratio suggests the SWCNTs are not properly dispersed, and the interfacial adhesion factor (IAF) suggests poor interfacial adhesion. It is shown the coefficient of thermal expansion (CTE) of the composite decreases with increasing SWCNT volume fraction, which is due to the lower CTE and higher stiffness of SWCNT
Shown the CTE of the composite decreases with increasing SWCNT volume fraction, which is due to the lower CTE and higher stiffness of SWCNT
Summary
Since the discovery of multi-wall carbon nanotubes (MWCNTs) in 1991 by Iijima [1], and subsequent synthesis of single-wall carbon nanotubes (SWCNTs) [2,3], numerous experimental and theoretical studies have been carried out to investigate the electronic, chemical, and mechanical properties of CNTs. Wang et al [10] studied the CTEs of nanocomposites reinforced by functionalized SWCNTs, and found that a reduction of 52% is observed below the glass transition temperature Tg. the CTE above Tg increases significantly due to the contribution of phonon modes and Brownian motions. These studies show inconsistent results, which can be attributed to two competing mechanisms: (1) the high stiffness and low CTE will restrain the expansion of the matrix, causing the decrease in the CTE; (2) the phonon modes and Brownian motions increase the CTE.
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