Dynamic mechanical properties of multiwall carbon nanotube reinforced ABS composites and their correlation with entanglement density, adhesion, reinforcement and C factor

Sharma, Sheela; Singh, Bhanu Pratap; Arya, Abhishek; Dhakate, Sanjay R.

doi:10.1039/c5ra25561a

Cited by 155 publications

(139 citation statements)

References 59 publications

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“…For most of the hybrid samples, the HDT value remained unchanged; a distinct decrease was recorded for only the BC‐rich samples; this decrease could be clearly tracked in the displacement chart of the individual samples (see Figure ). The results of the analysis clearly confirmed the absence of significant changes in the thermal resistance of the prepared composites; this is quite typical for amorphous polymers and has been confirmed for many types of carbon‐based reinforcing particles, such as CFs, graphite, and even carbon nanotubes . Small fluctuations in HDT were mainly associated with a shift in the glass transition, whereas the only significant decrease in the heat resistance concerned only the reference, BC‐filled samples.…”

Section: Resultssupporting

confidence: 72%

Polycarbonate biocomposites reinforced with a hybrid filler system of recycled carbon fiber and biocarbon: Preparation and thermomechanical characterization

Andrzejewski

Misra

2018

J of Applied Polymer Sci

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In this article, we present the investigation of the use of a partly biobased hybrid reinforcement system to improve the mechanical properties of polycarbonate (PC). To minimize the amount of recycled carbon fibers (rCFs) used in this study, their initial quantity of 20% was reduced and replaced by pyrolyzed biocarbon (BC) particles in amounts of 5%, 10%, 15%, and 20%. The materials were prepared during an extrusion‐/injection‐molding processing procedure. In addition to basic mechanical tests (tensile, flexural, and Izod tests), the samples were also subjected to detailed dynamic mechanical analysis to determine the thermomechanical relationships, such as the C factor, entanglement density, adhesion factor, and reinforcing efficiency. The results confirm the positive effect of hybridization, especially for the samples with low BC contents. In relation to the 20% pure BC composites, the hybrid samples containing the same amount of mixed filler (10%; rCF10–BC10) achieved an almost triple (270%) increase in the tensile strength and a 35% increase in the modulus. The impact resistance was also increased by 170%. Differential scanning calorimetry analysis showed significant changes in the glass‐transition temperatures for the BC‐rich samples; this was due to the sensitivity of the PC matrix to the processing degradation. The application of a small quantity of epoxy‐based chain extender proved to be effective in reducing this unfavorable phenomenon. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46449.

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Section: Resultssupporting

confidence: 72%

Polycarbonate biocomposites reinforced with a hybrid filler system of recycled carbon fiber and biocarbon: Preparation and thermomechanical characterization

Andrzejewski

Misra

2018

J of Applied Polymer Sci

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“…From Figure a, it is seen that the storage modulus is neat TPS is low compared to all other composites. But as the temperature increases, value of storage modulus decreases ascribed to the increase in molecular mobility of polymeric chains . Higher moduli observed for TPS/CNF3 and TPS/CNC 1.…”

Section: Resultsmentioning

confidence: 88%

Cellulose Nanofiber vs Nanocrystals From Pineapple Leaf Fiber: A Comparative Studies on Reinforcing Efficiency on Starch Nanocomposites

Balakrishnan

Gopi

Geethamma

et al. 2018

Macromolecular Symposia

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Cellulose nanofibers (CNFs) and nanocrystals (CNCs) are nanoscale materials obtained from nature by various physical and chemical treatments that has a strong reinforcing ability. CNFs and CNCs have different size, shape, viscosity, and other properties. This study focusses on comparative studies on reinforcing effect of CNFs and CNCs on thermoplastic starch (TPS). The nanocomposites with different weight percentage of reinforcing fillers are fabricated via solvent casting. The transparent TPS/CNF and TPS/CNC films are well characterized using dynamic mechanical analysis to study the effect of filler loading on viscoelastic behavior. All the nanocomposite films has better properties compared to neat TPS. But comparing the properties of CNFs and CNCs on the starch matrix, at some point of time, TPS/CNC composites are more transparent. But due to higher degree of entanglement, strong intermolecular attraction between starch and nanofibers, TPS/CNF composites are better, and the authors modeled the data with DMA and found that the nanofibers have better reinforcing ability and stress transfer character than CNCs. This type of comparative studies helps to find out the proper criteria to reinforce bio‐based material like starch for various applications.

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“…The coefficient "C" parameters are calculated by using formulae 42,43 : The coefficient "C" parameters are calculated by using formulae 42,43 :…”

Section: Dynamic Mechanical Propertiesmentioning

confidence: 99%

“…It can be expressed as42 :A= …………………(6)Where V f , tanδ c and tanδ p are volume fraction of filler, damping factor of composite and pure PC polymer, respectively. % of filler loading on adhesion factor (a) 2 weight.…”

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confidence: 99%

Synergistic effect on static and dynamic mechanical properties of carbon fiber-multiwalled carbon nanotube hybrid polycarbonate composites

et al. 2016

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Carbon fiber (CF), CF and multiwall carbon nanotube (MWCNT) reinforced hybrid micronanocomposites were prepared through melt mixing followed by injection molding. The synergistic effect on both static and dynamic mechanical properties with MWCNT/aMWCNT and CF reinforcement in polycarbonate matrix is investigated by utilizing dynamic mechanical analysis, flexural and tensile measurements. The enhancement in flexural modulus and strength of composite specimens reinforced with maximum loading of CF and CF-functionalized MWCNT is 128.40%, 142.94% and 42.60% and 39.90%, respectively, as compared to pure PC. Similarly, storage modulus of composite specimens reinforced with maximum loading of CF and CF-functionalized MWCNT shows increment of 203.33% and 176.57%, respectively over pure PC at 40 o C. Various type of parameter such as coefficient "C" factor, degree of entanglement and adhesion factor have been calculated to analyze the interaction between fillers and polymer matrix. Composite specimens containing 2 wt.% of functionalized MWCNTs demonstrates the lower C value than as synthesized MWCNT, indicative of higher effectiveness of functionalized MWCNT containing composite specimens. These results were well supported by optical microscopy and Raman spectroscopy by confirming the distribution of reinforcements and its interaction to PC, respectively. hybrid nanocomposites, which is shown in Figure 2 (c) and (d), respectively. All of this is also evident from the actually failed composite samples shown in Figure 2 (e) and (f). The point of fracture for samples moves toward the edge of the neck along with CF concentration that supports the deduction of improvement in the brittleness of composite materials with respect to CF amount. The role of fillers can be identified by comparing stress values of various composite materials. As seen from Figure 2 (c) and (d), strain values (above and below the yielding point) show higher stress values for composite materials with increased filler loading, below their elongation at break. The hybrid micro-nanocomposites shows both higher stress and strain values. This type of evaluation is necessary for applications requiring to identify a composite material with higher stiffness and not undergo the yielding beyond a specified level along with maintaining its higher strength properties 41 .Figure 2: Tensile stress-strain curve of (a) CF/PC composites, (b) Zoom on stress-strain curve, (c) Hybrid micro-nanocomposites (CF/CNT/PC), (d) Zoom on a stress-strain curve (e) and (f) Fracture behavior of actually failed composite specimens.

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Dynamic mechanical properties of multiwall carbon nanotube reinforced ABS composites and their correlation with entanglement density, adhesion, reinforcement and C factor

Abstract: Herein, the dynamic mechanical properties of MWCNTs reinforced ABS composites have been studied using a DMA and the results have been correlated with entanglement density, adhesion, reinforcement and C Factor.

Cited by 155 publications

References 59 publications

Polycarbonate biocomposites reinforced with a hybrid filler system of recycled carbon fiber and biocarbon: Preparation and thermomechanical characterization

Polycarbonate biocomposites reinforced with a hybrid filler system of recycled carbon fiber and biocarbon: Preparation and thermomechanical characterization

Cellulose Nanofiber vs Nanocrystals From Pineapple Leaf Fiber: A Comparative Studies on Reinforcing Efficiency on Starch Nanocomposites

Synergistic effect on static and dynamic mechanical properties of carbon fiber-multiwalled carbon nanotube hybrid polycarbonate composites

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