Alteration of the mechanical behaviour of polypropylene owing to successive introduction of multiwall carbon nanotubes and stretching

Katerelos, D.T.G.; Joffe, Roberts; Labou, Diamantoula; Wallström, Lennart

doi:10.1007/s11029-009-9092-7

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…This increase in the T g is attributed to the reinforcing effect of SWCNTs, hindering the mobility of the chains. However, in PP/MWCNTs the glass transition temperature as determined from DMA is decreasing in the case of the nanocomposites compared to the pure iPP matrix [ 19 , 36 , 37 ]. Dynamic mechanical properties of PP/CNTs nanocomposites were found that depends also from the type of the used CNTs [ 38 ].…”

Section: Pp/cnts Nanocompositesmentioning

confidence: 99%

Microstructure and Properties of Polypropylene/Carbon Nanotube Nanocomposites

2010

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In the last few years, great attention has been paid to the preparation of polypropylene (PP) nanocomposites using carbon nanotubes (CNTs) due to the tremendous enhancement of the mechanical, thermal, electrical, optical and structural properties of the pristine material. This is due to the unique combination of structural, mechanical, electrical, and thermal transport properties of CNTs. However, it is well-known that the properties of polymer-based nanocomposites strongly depend on the dispersion of nanofillers and almost all the discussed properties of PP/CNTs nanocomposites are strongly related to their microstructure. PP/CNTs nanocomposites were, mainly, prepared by melt mixing and in situ polymerization. Young’s modulus, tensile strength and storage modulus of the PP/CNTs nanocomposites can be increased with increasing CNTs content due to the reinforcement effect of CNTs inside the polymer matrix. However, above a certain CNTs content the mechanical properties are reduced due to the CNTs agglomeration. The microstructure of nanocomposites has been studied mainly by SEM and TEM techniques. Furthermore, it was found that CNTs can act as nucleating agents promoting the crystallization rates of PP and the addition of CNTs enhances all other physical properties of PP. The aim of this paper is to provide a comprehensive review of the existing literature related to PP/CNTs nanocomposite preparation methods and properties studies.

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Section: Pp/cnts Nanocompositesmentioning

confidence: 99%

Microstructure and Properties of Polypropylene/Carbon Nanotube Nanocomposites

2010

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“…[5][6][7] The added particles can, for example, enhance the fire resistance, toughen the material, and introduce electrical conductivity and shielding properties to the material. [8][9][10][11][12][13][14] In order to achieve satisfactory properties of these functional materials, it is vital to have a known spatial distribution of the functionality throughout the material and it is of great interest to develop methods to control the distribution of particles during manufacturing. With a controlled particle distribution the functionality sought for can be optimised without sacrificing other properties.…”

Section: Introductionmentioning

confidence: 99%

Modelling of particle deposition during impregnation of dual scale fabrics

Frishfelds

Lundström

2011

Plastics, Rubber and Composites

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The motion of particles through a system of permeable fibre bundles is considered. The system is discretisised with Voronoi diagrams and the dissipation rate of energy is minimised with respect to the stream function in a system with periodic boundary conditions. The flow of the particles is in the transversal direction to the fibre bundles and the particles are hindered to move out of the plane allowing for two-dimensional calculations. The motion of particles is assumed to be slow with respect to the flowrate so that particles are driven by the Stokesian force for stationary particles. In this case, the flow distribution is essentially dependent on the particle configuration and strictly follows the motion of particles. When testing different sizes of the particles, it is shown that there is a qualitative agreement between model and experiments previously performed. In particular, stationary flow leads to particle depositions in front of the fibre bundles and small particles move into the fibre bundles while large ones are stuck at the border.

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“…Now interest is growing in the development of hierarchical (or multiscale) composites, in which a nanoscale structure is utilised alongside the traditional microscale reinforcing fibres. [1][2][3] Besides adding functional properties such as thermal resistance, electromagnetic shielding and conductivity, the introduction of these filler particles often increases the mechanical properties of the material. Significant improvement in mechanical properties of structural composites was observed when carbon nanofibre was added to toughen the polyester matrix.…”

Section: Introductionmentioning

confidence: 99%

Motion of dispersed carbon nanotubes during impregnation of fabrics

Högberg

Lundström

2011

Plastics, Rubber and Composites

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Interest is growing in the development of hierarchical composites, in which nanoscale particles are used alongside the traditional microscale reinforcing fibres. To produce high quality multiscale materials, knowledge of mechanisms governing nanofibre distribution and orientation is crucial. In this work, analysis and numerical simulations are used to model the motion of dispersed carbon nanotubes during impregnation of dual scale fabrics in composites manufacturing. Results suggest that nanofibre displacement and orientation is mainly deterministic on mesoscale, while typically random on microscale. The randomising Brownian torque may still influence the motion and trigger the fibre to make 180u rotations in the former, however, when acting together with the fluid shear. Fibre deposition may lead to a total blockage of the flow within the microchannels, whereas only minor deposition is expected in the mesochannels.

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Alteration of the mechanical behaviour of polypropylene owing to successive introduction of multiwall carbon nanotubes and stretching

Cited by 8 publications

References 19 publications

Microstructure and Properties of Polypropylene/Carbon Nanotube Nanocomposites

Microstructure and Properties of Polypropylene/Carbon Nanotube Nanocomposites

Modelling of particle deposition during impregnation of dual scale fabrics

Motion of dispersed carbon nanotubes during impregnation of fabrics

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