Properties of well aligned SWNT modified poly (methyl methacrylate) nanocomposites

Simulations and electrical conductivity of percolated networks of finite rods with various degrees of axial alignment

“…The effects of carbon nanotube orientation on electrical conductivity in polymer composites have been observed in doctor-bladed composites of multiwalled carbon nanotubes ͑MWCNTs͒ and cross-linked poly͑furfuryl alcohol͒ 12 and in stretched composites of SWCNT and poly͑methyl methacrylate͒ ͑PMMA͒. 13 These composites exhib- Table I. ited anisotropic electrical conductivity, with different values parallel and perpendicular to the alignment direction. In both of these materials, the conductivity parallel to the direction of nanotube alignment exceeded that perpendicular to it at all filler concentrations.…”

Highly conducting poly(methyl methacrylate)/carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties

“…Literature survey in conducting PMMA/CNT systems reveals several works prepared by the common methods of solution mixing/casting [7][8][9]11,12,[20][21][22][23][24] and in-situ polymerization [8,9,25], and a limited number of studies where other more sophisticated techniques were employed (coagulation [26,27], electrospinning [28], latex technology 3 [29], combination of solvent casting and melt mixing [30]). Surprisingly, there are only few works in systems prepared by melt mixing, even though this method has been widely applied in other thermoplastic matrices, since it offers several advantages such as speed, simplicity, low cost, absence of solvents and availability of the required equipment in the plastic industry.…”

The effects of CNT alignment on electrical conductivity and mechanical properties of SWNT/epoxy nanocomposites

“…These opportunities include the use of CNTs as conductive filler in insulating polymer matrices and as reinforcement in structural materials [3][4][5][6][7][8]. The use of composites made from an insulating matrix and highly conductive fillers is becoming more and more important due to their ability to electromagnetically shield and prevent electrostatic charging of electronic devices [5][6][7][8]. On the other hand, epoxy resin was well established as advanced composites, displaying a series of interesting characteristics, which can be adjusted within broad boundaries.…”

“…Several publications reported the progress made in fabrication and characterization of CNT nanocomposites. Usually, in order to achieve a homogenous dispersion of CNTs in the composite matrix, the composite with a low CNT loading is fabricated by solution casting method or in situ polymerization method and the matrix is ultrasonicated for a long time in the polymerization process [2,6,9]. Sometimes, surfactant is also used to promote the dispersion of CNTs in the composite matrix [2,9].…”

“…It is well known that the CVD technique fabricated pristine SWNTs or MWNTs product is often in the intertwisted or distorted form which is disadvantageous for the dispersion of CNTs in the composite matrix. In this research, the anode arc discharge method produced quasistraight SWNT was used as filler in the polymer/SWNT composite to prevent the agglomerating, to promote the dispersion, and to benefit the realignment of SWNTs in the composite matrix, especially in the composite matrix with a high SWNT loading [6]. In order to achieve a strong interfacial bonding of SWNT and polymer, the SWNT is usually functionalized with some radical group chemically.…”