Fabrication and characterization of multiwalled carbon nanotubes/silicone rubber composites

Iqbal, Nadeem; Khan, Mohammad Bilal; Sagar, Sadia; Maqsood, Asghari

doi:10.1002/app.38410

Cited by 30 publications

(28 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nanoreinforcements give better mechanical, thermal and electrical results when incorporated into the polymer matrixes compared to macro/micro size incorporations attributed owing to their large low density, specific surface area, and nanoscale interaction with the polymeric chains [1]. Nanofillers, even in little quantity (0.1-5 wt %), have the capability to efficiently enhance the physical and chemical characteristics of the host matrix.…”

Section: Introductionmentioning

confidence: 99%

MWCNTS Incorporated Natural Rubber Composites: Thermal Insulation, Phase Transition and Mechanical Properties

Sagar¹,

Iqbal²,

Maqsood³

et al. 2014

IJET

Self Cite

View full text Add to dashboard Cite

Abstract-The effect of variant concentrations of multiwalled carbon nanotubes (MWCNTs) on the thermal transport, phase transition temperatures, and mechanical properties of polyisoprene rubber have been studied in the present novel research. MWCNTs were incorporated into the natural rubber (NR) using shear mixing techniques. Microscopy results reveal the uniform dispersion of the nanotubes within the polymer matrix. Thermal conductivity and thermal insulation of the fabricated composites were evaluated according to ASTM standards. Thermal transport through the nanocomposite specimens is restricted by the nanotubes network developed within the polymer matrix. Differential scanning calorimetric study elucidates the reduction of crystallization (T c ) and glass transition (T g ) temperatures, while melting temperature (T m ) enhances with increasing the nanotubes concentration in the rubber matrix. A remarkable enhancement in mechanical properties of MWCNT/NR composites was observed with increasing nanotube to matrix ratio.Index Terms-Multiwalled carbon nanotubes, thermal transport properties, nanocomposite, thermal stability, phase transition temperatures. I. INTRODUCTIONNanoreinforcements give better mechanical, thermal and electrical results when incorporated into the polymer matrixes compared to macro/micro size incorporations attributed owing to their large low density, specific surface area, and nanoscale interaction with the polymeric chains [1]. Nanofillers, even in little quantity (0.1-5 wt %), have the capability to efficiently enhance the physical and chemical characteristics of the host matrix. Carbon nanotubes (CNTs) have a prominent image among the nanofillers family due to their outstanding features. The tensile strength and elastic modulus equal that of diamond, i.e., 200 Giga Pascal and 1Tera Pascal, respectively. CNTs have high specific surface area up to 1315m 2 /g, aspect ratio up to 10 4 and low density (1.3g/cm 3 ) [2]. Due to the exceptional character of nanotubes, researchers around the world have introduced them into the polymer, metal and ceramic matrixes using different dispersion Manuscript received April 22, 2013; revised July 25, 2013 techniques to fabricate nanocomposites for engineering applications, i.e., automobile industry, sports industry, membrane technology, aerospace industry, energy storage and many more. In order to fabricate an affective composite, aspect ratio of the nanotube should not be diminished. The CNTs/polymer nanocomposites have also shown outstanding thermal stability in nitrogen as well as in oxygen atmospheres. Uniformly dispersed nanotubes develop a network in a polymer matrix that restricts the thermal mobility of polymeric chains in the heat atmosphere [3]. Polyisoprene rubber (NR) with superb thermal/mechanical properties, oil/hot air ageing and swelling resistance has extensively used in automobile and oil industries. Selection and designing of a composite for a specific application necessitate its thermal transport/endurance data. Evaluation of thermal pr...

show abstract

Section: Introductionmentioning

confidence: 99%

MWCNTS Incorporated Natural Rubber Composites: Thermal Insulation, Phase Transition and Mechanical Properties

Sagar¹,

Iqbal²,

Maqsood³

et al. 2014

IJET

Self Cite

View full text Add to dashboard Cite

show abstract

“…The addition of S‐MWCNTs in the host polymer matrix augments the rubber hardness due to strong interaction of nanotubes to polymeric chains of the EPDM. Another reason to enhance elastomeric hardness is reduction of chain mobility with increasing S‐MWCNTs concentration in the host matrix …”

Section: Resultsmentioning

confidence: 99%

Tailoring in thermomechanical properties of ethylene propylene diene monomer elastomer with silane functionalized multiwalled carbon nanotubes

Iqbal

Jamil

et al. 2015

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

The incorporation of silane treated multiwalled carbon nanotubes (S‐MWCNTs) is used as an effective path for tailoring thermomechanical properties of ethylene propylene diene monomer (EPDM). In this study, S‐MWCNTs were introduced into EPDM using internal dispersion kneader and two roller mixing mill. By altering the mass ratio of S‐MWCNTs from 0 to 1, thermal conductivity, thermal stability and phase transition temperatures and their respective enthalpies are discussed of the fabricated nanocomposites. It is observed that silane modification improves their dispersion and increases the interfacial bonding between MWCNTs and polymer matrix. Scanning electron microscopy along energy dispersive spectroscopy analysis is performed to confirm the silane functionalized MWCNTs are selectively distributed in the host polymer. More importantly, an important increase in mechanical properties like ultimate tensile strength and hardness is achieved through introducing silane functionalized MWCNTs. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43221.

show abstract

“…4b). It means that the incorporation of 8 wt% CerFs in the polymer matrix has reduced the peak backface temperature up to 112 o C compared to EC1 ablator due to the low thermal conductivity/diffusivity and high thermal stability of the aluminum silicate fiber [9]. Peak backface temperature and backface temperature evolution rates (BTER) of the CerF/EPDM ablators are also displayed in Fig.…”

Section: B Backface Temperature Evolution and Insulation Indexmentioning

confidence: 92%

Comprehensive Ablation Characteristics of Ceramic Fibers Impregnated Rubber Composites

Iqbal¹

2014

IJET

Self Cite

View full text Add to dashboard Cite

Abstract-In this novel research, aluminum silicate fibers were incorporated into ethylene propylene diene monomer (EPDM) rubber to fabricate ablative composites, achieve better ablation performance, and thermal endurance for ultrahigh temperature applications. Variant concentrations of ceramic fibers (CFs) were impregnated in the elastomeric matrix. Ablation testing of the composite specimens was carried out according to ASTM E285-08, in which oxyacetylene torch was used as a high temperature source. The obtained results showed that anti-ablation performance of the polymer composites was remarkably augmented with increasing fiber concentration in the polymer matrix. Thermal decomposition of the fabricated composites was diminished with the progressive incorporation of CFs in the EPDM matrix. Ultimate tensile strength, elongation at break, and modulus of elasticity were reduced due to the weak fiber to matrix interaction while Shore A rubber hardness was augmented with increasing fiber to matrix ratio. Voids formation & polymer pyrolysis of the ablated specimens, char reinforcement interaction, CFs dispersion in the polymer matrix, elemental analysis and fiber diameter measurement of the CF, and the compositional analysis of ablative composite were analyzed using scanning electron microscopy coupled with energy dispersive spectroscopy.Index Terms-Ablative composites, ceramic fibers, mechanical properties, thermal degradation, thermal conductivity, temperature evolution. I. INTRODUCTIONA composite is commonly defined as a combination of two or more distinct materials, each of which retains its own distinctive properties, to create a new material with desirable properties that cannot be achieved by any of the components acting alone [1]. On the basis of continuous phase (Matrix), composites materials are classified into three main broad categories, i.e. Metal matrix composites (MMCs), Ceramic matrix composites (CMCs), and Polymer matrix composites (PMCs) [2].PMCs are composed of a matrix (polymer) from thermoplastics materials (polycarbonates, polyvinyl chloride, nylon, polystyrene, etc) as continuous phase or thermoset (unsaturated polyesters, epoxies, phenolic resins, polydimethylsiloxane, etc) An ablative composite is a type of composites, which are used to protect certain structure or equipment from the intense heat environment. Mostly, such types of composites are used in aerospace industry. The basic definition of ablative composites is "These are highly endothermic sacrificial materials used to protect the hardware from ultra high temperatures and shear stresses in the propulsion system." Low backface temperature, high mechanical/thermal ablation resistance, and good interfacial adhesion between the ablative material and the aerodynamic surface are required for the composites used in Thermal Protection Systems (TPS) [3]. The main function of TPS materials is to protect the inner hardware of space vehicles and ballistic missiles from ultrahigh temperature/velocity flow of gases encountered during their mis...

show abstract

Fabrication and characterization of multiwalled carbon nanotubes/silicone rubber composites

Cited by 30 publications

References 30 publications

MWCNTS Incorporated Natural Rubber Composites: Thermal Insulation, Phase Transition and Mechanical Properties

MWCNTS Incorporated Natural Rubber Composites: Thermal Insulation, Phase Transition and Mechanical Properties

Tailoring in thermomechanical properties of ethylene propylene diene monomer elastomer with silane functionalized multiwalled carbon nanotubes

Comprehensive Ablation Characteristics of Ceramic Fibers Impregnated Rubber Composites

Contact Info

Product

Resources

About