Abstract
In this paper, the “B” interphase parameter in the Pukanszky model and interphase strength for polymer carbon nanotube (CNT) nanocomposites are expressed by the critical interfacial shear strength (τc) and interfacial shear strength (τ) between a polymer matrix and CNTs. A suggested model and a developed Pukanszky model for tensile strength of nanocomposites are combined to develop the equations for “B” and interphase strength. Many experimental data for various samples confirm the models. The impacts of all parameters on the “B” and interphase strength are explained to approve the developed equations. The contour plots display the same trends for the roles of all parameters in the “B” and interphase strength. Low “τc”, high “τ”, thin and large CNTs as well as a dense interphase are ideal to obtain the high levels for “B” and interphase strength. Among the studied parameters, CNT size largely controls the “B” and interphase strength, while the waviness and strength of CNTs play insignificant roles.
Highlights
There is a critical interfacial shear strength controlling the stress transferring via interphase region
In the case of imperfect interphase between polymer matrix and Carbon nanotubes (CNT), which is normal in nanocomposites, the interphase region is not strong enough for efficient stress transferring from polymer matrix to CNT
We considered the average R 1⁄4 10 nm and l 1⁄4 10 mm for the samples excluding the data of CNT size
Summary
Carbon nanotubes (CNT) can noticeably increase the performance of nanocomposites, because they include high aspect ratio, very high modulus and considerable conductivity.[1,2,3,4,5,6,7,8,9,10] The high aspect ratio of CNTs produces a low percolation threshold in nanocomposites establishing a CNT network by a low concentration of CNTs.[11,12] polymer CNT nanocomposites are good candidates for many applications such as electronics, biosensors, actuators, aerospace structures and automotive components.[13,14,15,16,17,18,19,20,21] The main difficulties for the production of polymer CNT nanocomposites include the deprived spreading of CNTs and the poor interfacial attachment between polymer media and CNTs.[22,23] As a result, improving the processing terms and using the modi ed/functionalized nanoparticles are recommended to solve these problems and promote the nanocomposite performance.[24,25,26,27,28,29,30,31,32,33,34,35]. A potent interphase ampli es the stress bearing promoting the performance of nanocomposites These observations demonstrate the important roles of interfacial/ interphase properties in the nanocomposites. The incomplete interphase unsuccessfully transports the stress from polymer matrix to nanoparticles, because it is not strong enough for efficient stress transferring In this case, there is a critical interfacial shear strength (sc) controlling the stress transferring via interphase region. The current study tries to express the “B” interphase term (in Pukanszky model) and interphase strength in polymer CNT nanocomposites assuming “sc” and “s”. Many experimental data are applied to con rm the models These models are joined to express the “B” term in Pukanszky model as a function of “s”, “sc” and CNT size. The roles of all parameters in the “B” and interphase strength are explained to con rm the established equations
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