Tensile properties of carbon nanofiber reinforced multiscale syntactic foams

Colloca, Michele; Gupta, Nïkhil; Porfiri, Maurizio

doi:10.1016/j.compositesb.2012.02.030

Cited by 75 publications

(46 citation statements)

References 38 publications

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“…In this context, researchers worldwide are exploring ways to improve the mechanical properties of syntactic foams, the most common being the introduction of additives. In this context, polymeric syntactic foams have been reinforced with different types of additives, including one‐dimensional carbon nanotubes, nanofibers, two‐dimensional graphene, and nanoclay . Note that the geometry, particle dimensions, and degree of loading do play a pronounced role in determining the properties of the resulting foams.…”

Section: Introductionmentioning

confidence: 99%

Poly(dimethylsiloxane)‐toughened syntactic foams

Ullas

Kumar

Roy

2017

J of Applied Polymer Sci

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The potential of preformed elastomers as a toughening agent for epoxy–glass syntactic foam has been explored. Poly(dimethylsiloxane) microspheres were prepared by suspension polymerization. The microsphere dimensions could be varied from 58 to 255 µm by tuning the reaction parameters, particularly the stirring speed and feed concentration. Rheological studies indicated that the introduction of microballoons led to an increase in the viscosity of the resin, with the extent being proportional to the microballoon content. The zero shear viscosity increased from ∼103 mPa s at 30 °C to 105 mPa s as the microballoon loading was increased to 40%. Syntactic foams containing varying amounts of microballoons (40–60% v/v) were prepared, and an analogous set of toughened foams were also prepared, where a fraction of the microballoons was replaced with poly(dimethylsiloxane) microspheres (3–7%). The effect of increasing dimensions of the elastomeric microspheres on the mechanical properties was also studied. The improvement in properties was more pronounced when the microsphere size was equivalent to that of the constituent microballoons. An improvement of 40% and 185% in flexural strength and flexural toughness was observed upon the introduction of poly(dimethylsiloxane) microspheres of optimal dimensions (diameter ∼63 µm, 5% loading), without any undesirable increase in foam density. However, the compressive properties remained practically unaltered. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45882.

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Section: Introductionmentioning

confidence: 99%

Poly(dimethylsiloxane)‐toughened syntactic foams

Ullas

Kumar

Roy

2017

J of Applied Polymer Sci

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“…Polycarbonate composites reinforced with up to 25 wt% CNFs have demonstrated an increase in the composite hardness and the modulus by approximately 56 and 105 %, respectively, compared to neat polycarbonate [9]. Nanoindentation analyses have been carried out on epoxy composites containing 1 wt% VGCNFs, where the hardness was measured to reach a value of 217 MPa [23]. The tensile modulus that was measured through tensile analysis in the same study was measured to be 28 % lower than the modulus measured through nanoindentation.…”

Section: Other Mechanical Propertiesmentioning

confidence: 99%

“…Scanning probe microscopy images of the indentation on the CNF/epoxy surface are shown in Fig. 3.4 [23].…”

Section: Other Mechanical Propertiesmentioning

confidence: 99%

Mechanical Properties of CNF/Polymer Composites

Poveda

Gupta

2015

Carbon Nanofiber Reinforced Polymer Composites

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This chapter discusses the effect of composition of CNF reinforced nanocomposites on their mechanical properties measured under tensile, compressive, and flexural loading. The structure of the CNFs plays an important role in determining the reinforcement efficiency. In most cases, random CNF dispersed nancomposites have been studied. Thermoplastic resin, thermosetting resin, and elastomer matrix nanocomposites have been studied. Polypropylene is the most common thermoplastic resin that is reinforced with CNFs. Among thermosets, epoxy and vinyl ester resin matrix nanocomposites are studied. The strength and stiffness improve, depending on the volume fractions of CNF dispersed within several different polymer matrices. It is noted that compared to the mechanical properties of single CNFs reported in Chap. 2, the level of enhancement of mechanical properties of nanocomposites is only moderate. The bending of long aspect ratio fibers and stacked-cup structures are potential reasons for this outcome. Nevertheless, combined with other properties, such as electrical and thermal conductivity increase in otherwise insulating resins, the moderately enhanced nanocomposites can develop new applications.Keywords Carbon nanofiber · Nanocomposites · Dispersion · Mechanical property · Flexural properties · Viscoelastic properties Literature ReviewThe potential of using carbon based fibers in developing high performance composite materials has been recognized for a long time [1]. Carbon microfiberbased polymer matrix laminates have been widely studied and used in numerous structural applications. The ever-increasing demand for higher performance fibers and composites has resulted in continuous improvement in the properties of microfibers and also of development of carbon nanofibers and nanotubes. Fibers of different length or diameter scales are sometimes combined into novel structures

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“…Previous studies [10][11][12] have shown that the properties of the syntactic foams can be tailored by varying the volume fraction and the wall thickness of the hollow particles. Besides, another phase of materials such as discontinuous fibers or nanoclays has been successfully embedded to further improve the performance of the composites [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Strength Analysis of Syntactic Foams Using a Three-Dimensional Continuum Damage Finite Element Model

Shan

Nian

et al. 2015

Journal of Applied Mechanics

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The failure behavior of the syntactic foams is investigated based on a three-dimensional (3D) micromechanical finite element (FE) model, by varying the volume fraction, the wall thickness of the hollow particles, and the interfacial strength. The maximum princi pal stress criterion is adopted to determine the state (damaged or undamaged) for both interface and matrix. Material property degradation is used to describe the mechanical behavior of those damaged elements. The current model can reasonably predict the ten sile strength of the syntactic foams with high volume fractions (40%-60%). The failure mechanism of the syntactic foam under uniaxial tension is captured by analyzing the stress-strain curves and the contours of damaging evolution process. Results from the quantitative simulations demonstrate that the tensile strength of the syntactic foam can be improved effectively by enhancing the interfacial strength.

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Tensile properties of carbon nanofiber reinforced multiscale syntactic foams

Cited by 75 publications

References 38 publications

Poly(dimethylsiloxane)‐toughened syntactic foams

Poly(dimethylsiloxane)‐toughened syntactic foams

Mechanical Properties of CNF/Polymer Composites

Strength Analysis of Syntactic Foams Using a Three-Dimensional Continuum Damage Finite Element Model

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