Sensitivity and dynamic electrical response of CNT-reinforced nanocomposites

Heeder, N.; Shukla, Arun; Chalivendra, Vijaya; Yang, Sze C.

doi:10.1007/s10853-011-6235-8

Cited by 43 publications

(21 citation statements)

References 21 publications

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“…The ultrasonicator (supplied by Cole-Parmer with a model number: CP 750 with a power of 750 Watts) was set to pulse mode (4 s on and 9 s off) to disperse the CNTs at micro-scale. Since the ultrasonication process generates heat, the epoxy mix is placed in an ice bath to maintain the temperature no more than 25 C. [2][3][4][5][6][7] After performing the above mixing process for 40 min, the mix is then placed in a vacuum chamber to remove entrapped air bubbles for about 3 h. Later, hardener was added to the mix and the above process was again repeated. Once again, the entire epoxy mix was placed in the vacuum chamber, this time for 20 min to remove any further air bubbles generated during the mixing of hardener.…”

Section: Fabricationmentioning

confidence: 99%

Electro-mechanical studies of multi-functional glass fiber/epoxy reinforced composites

O’Donnell

Chalivendra

Hall

et al. 2019

Journal of Reinforced Plastics and Composites

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An experimental study is performed to investigate the electro-mechanical response of three-dimensionally conductive multi-functional glass fiber/epoxy laminated composites under quasi-static tensile loading. To generate a threedimensional conductive network within the composites, multi-wall carbon nanotubes are embedded within the epoxy matrix and carbon fibers are reinforced between the glass fiber laminates using an electro-flocking technique. A combination of shear mixing and ultrasonication is employed to disperse carbon nanotubes inside the epoxy matrix. A vacuum infusion process is used to fabricate the laminated composites of two different carbon fiber lengths (150 mm and 350 mm) and four different carbon fiber densities (500, 1000, 1500, 2000 fibers/mm 2). A four circumferential probe technique is employed to measure the in-situ electrical resistance of composites under tensile load. Although composites of both carbon fiber lengths showed significant decrease of sheet resistance under no mechanical load conditions, composites of 350 mm long carbon fibers showed the lowest resistivity of 10 X/sq. Unlike the resistance values, composites of 350 mm carbon fibers showed a significant decrease in Young's modulus compared to 150 mm counterparts. For the electro-mechanical response, composites containing carbon fibers of 150 mm long demonstrated a maximum value of percentage change in resistance. These results were then compared to both 350 mm and no added carbon fibers under quasi-static tensile loading.

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Section: Fabricationmentioning

confidence: 99%

Electro-mechanical studies of multi-functional glass fiber/epoxy reinforced composites

O’Donnell

Chalivendra

Hall

et al. 2019

Journal of Reinforced Plastics and Composites

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“…The technique to simultaneously measure the electrical and mechanical response of the material is most similar to previous work by Heeder et al [15]. The primary distinction is the much higher mass loading of the 20% MWCNT CPnC investigated in this work.…”

Section: Apparatusmentioning

confidence: 85%

Rate dependence of electrical and mechanical properties of conductive polymer nanocomposites

Foley

Stilson

Smith

et al. 2015

EPJ Web of Conferences

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Abstract. Conductive polymer nanocomposites with enhanced electrical and thermal properties show promise as an alternative solution for electronic materials. For example, electronic interconnect materials will have comparable electrical and thermal conductivity to solder with an increased operating range of strain and temperature. This paper documents the fabrication and experimental evaluation of a prototype conductive polymer nanocomposite. Material selection, fabrication processes, and initial characterization of a low Tg polymer with a high fill ratio of carbon nanotubes is presented. The electrical and thermal properties of the composite are measured and compared with predictions. The mechanical properties are measured using dynamic mechanical analysis (DMA) over a wide temperature range. The mechanical and electrical responses of the conductive polymer composite are simultaneously measured at higher strain rates using a modified split Hopkinson pressure bar (SHPB) apparatus. The dynamic stress-strain response is obtained using traditional analytic methods (e.g., two-and three-wave analysis). The electrical response is observed using constant current excitation with high bandwidth (>500 kHz) instrumentation. The dynamic compression data implies the change in electrical resistance is solely a function of the material deformation, i.e., the material exhibits constant electrical conductivity and is insensitive to the applied loads. DMA and SHPB dynamic data are used to estimate the parameters in a Mulliken-Boyce constitutive model, and the resulting behavior is critically evaluated. Finally, progress towards improving the polymer composite's mechanical, electrical, and thermal properties are discussed.

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“…The combination of the remarkable mechanical properties and the exceptional electrical properties makes graphene an ideal candidate for use as a filler material in fabricating multi-functional composites capable of sensing material behavior. Many reports demonstrate the effectiveness of utilizing CNT reinforced polymer composites as strain and damage sensors [30][31][32][33]. More recently, similar studies have been conducted where graphene is utilized to provide strain sensing functions [34][35][36].…”

Section: Introductionmentioning

confidence: 97%

Electro-mechanical Behavior of Graphene–Polystyrene Composites Under Dynamic Loading

Heeder

Chakraborty

Bose

et al. 2015

J. dynamic behavior mater.

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An experimental investigation was conducted to understand the electro-mechanical response of graphene reinforced polystyrene (PS) composites under static and dynamic loading. Graphene/PS composites were fabricated using a solution mixing approach followed by hot-pressing. Absolute resistance values were measured with a highresolution four-point probe method for both quasi-static and dynamic loading. A modified split Hopkinson (Kolsky) pressure bar apparatus, capable of simultaneous mechanical and electrical characterization, was developed and implemented to investigate the dynamic electro-mechanical response of the composites. In addition to measuring the change in electrical resistance as well as the dynamic constitutive behavior, real-time surface damage and global deformation was captured using high-speed photography. The real-time damage was correlated to both stress-strain and percent change in resistance profiles. The experimental findings indicate that the bulk resistance of the composite increased significantly due to the brittle nature of the PS matrix and the presence of relative agglomerations of graphene platelets which resulted in microcrack formations. Scanning electron microscopy imaging gives further insight into the various damage mechanisms that occur within the composites subjected to a static or dynamic load. The results show that the change in transport properties can provide further insight into the microstructural evolution of composite materials during loading.

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Sensitivity and dynamic electrical response of CNT-reinforced nanocomposites

Cited by 43 publications

References 21 publications

Electro-mechanical studies of multi-functional glass fiber/epoxy reinforced composites

Electro-mechanical studies of multi-functional glass fiber/epoxy reinforced composites

Rate dependence of electrical and mechanical properties of conductive polymer nanocomposites

Electro-mechanical Behavior of Graphene–Polystyrene Composites Under Dynamic Loading

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