Enhanced electrical properties of polycarbonate/carbon nanotube nanocomposites prepared by a supercritical carbon dioxide aided melt blending method

Quigley, John P.; Herrington, Kevin; Baird, Donald G.

doi:10.1016/j.polymer.2014.09.043

Cited by 14 publications

(9 citation statements)

References 31 publications

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“…In addition to the special seamless nanometer tube structure, CNTs not only possess some properties of general nanometer materials, but also excellent mechanical properties (Young's modulus can be up to 1 TPa, and tensile strength can be up to 100 GPa) due to its high specific surface area and length to diameter ratio (length to diameter ratio can be up to 1,000) , as well as outstanding electrical and thermal conductive properties . The properties of polymeric materials can be improved or some new properties can be acquired when they are filled with CNTs . CNTs can be divided into two categories: single wall carbon nanotubes (SWCNTs) and muti‐walled carbon nanotubes (MWCNTs).…”

Section: Introductionmentioning

confidence: 99%

Melt extrudate swell behavior of multi‐walled carbon nanotubes filled‐polypropylene composites

Chen

Zhou

et al. 2015

Polymer Composites

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The extrudate swell behavior of polypropylene (PP) composite melts filled with multi‐walled carbon nanotubes (MWCNTs) was studied using a capillary rheometer in a temperature range from 190 to 230°C and at various apparent shear rates varying from 50 to 800 s−1. It was found that the values of the extrudate swell ratio of the composites increased nonlinearly with increasing apparent shear rates, while the values of the extrudate swell ratio decreased almost linearly with increasing temperature. The values of the melt extrudate swell ratio increased approximately linearly with increasing shear stress, while decreased approximately nonlinearly with an increase of the MWCNT weight fraction. In addition, the extrudate swell mechanisms were discussed with observation of the fracture surface of the extrudate using a scanning electronic microscopy. This study provides a basis for further development of MWCNTs reinforced polymer composites with desirable mechanical and thermal properties. POLYM. COMPOS., 38:2433–2439, 2017. © 2015 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Melt extrudate swell behavior of multi‐walled carbon nanotubes filled‐polypropylene composites

Chen

Zhou

et al. 2015

Polymer Composites

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“…The percolation threshold can be identified when the storage modulus (G') became larger than the loss modulus (G''). While Abdel‐Goad and Pötschke discovered differences in the rheological and electrical percolation thresholds, comparable values of the two thresholds were reported . A decrease in the composite's viscosity was observed with an increase in MWNTs dispersion .…”

Section: Introductionmentioning

confidence: 65%

“…While some found that well‐dispersed structures increased the electrical conductivity, other studies concluded formation of a network of MWNTs agglomerates increased the conductivity. Significant improvement in phase homogeneity observed by optical microscopy and TEM studies, when MWNTs were pretreated using supercritical carbon dioxide, was correlated to the reduction in electrical percolation threshold …”

Section: Introductionmentioning

confidence: 92%

“…CNTs are well known to be an excellent reinforcing material . It is also electrically conductive, and for this reason, incorporation of CNTs with electrically insulating polymers creates composites with dramatically altered electrical characteristics . Because of the notably high aspect ratio compared to other reinforcing and/or conductive fillers such as carbon black and clay, percolation threshold of CNTs can be achieved at much lower concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Properties characterisation of polycarbonate and multi‐walled carbon nanotubes composites prepared by solution technique

Thaithae¹,

Antonio

Wattanachai

2015

Asia-Pacific J Chem Eng

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Polycarbonate (PC) and multi-walled carbon nanotubes (MWNTs) composites were prepared by solution method where 0-20% w/w MWNTs were added into two types of PC solutions, i.e. a low and a high molecular weight solution. The composites were processed into plastic sheets using a compression moulding technique in order to study their mechanical, electrical, physical, and rheological properties. The results showed that addition of MWNTs at 1% w/w enhanced the tensile strength and modulus by up to 23 and 75%, respectively, and reduced their electrical resistivity significantly from being an insulator (1 × 10 16 À 1 × 10 17 Ω-cm) to a semi-conductor (8 × 10 8 Ω-cm), indicating a percolation threshold. A slight improvement in the mechanical properties was observed at up to 4% w/w MWNTs; however, the volume resistivity remained unchanged. As the amount of MWNTs increased >4% w/w, the mechanical properties drastically deteriorated because of the MWNTs agglomerating and segregating onto the surfaces. The segregation of the agglomerates was also supported by the surface resistivity and shear viscosity results, which decreased as MWNTs increased. MWNTs were found to interact better with the low molecular weight PC matrix and produced more homogeneous composites. The studies of composite colour and MWNTs dispersion confirmed the findings of both mechanical and electrical properties. This research demonstrates the possibility of preparation of PC and MWNTs composites at high MWNTs concentrations, which can be very useful for a master batch process.

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“…Highest conductivity (3 S/cm) was achieved at 10 wt% loading of MWCNT, and percolation threshold was observed at 2 to 3 wt% MWCNT loading. Supercritical CO 2 –aided melt mixing method was used for the generation of PC/MWCNT nanocomposites with high EC and improved dispersion . The electrical percolation threshold was reduced from 1.53% to 0.83% because of the scCO 2 processing method.…”

Section: Pc/cnt Nanocompositesmentioning

confidence: 99%

A review on the mechanical, electrical and EMI shielding properties of carbon nanotubes and graphene reinforced polycarbonate nanocomposites

Bagotia

Choudhary

Sharma

2018

Polymers for Advanced Techs

112

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Recently, it has been found that carbon nanotubes (CNTs) and graphene could prove to be the most promising carbonaceous fillers in polymers nanocomposites field because of their better structural and functional properties. Their uniform dispersion in polymer matrix leads to significant improvements in their several properties. This paper reviews the effect of nanofillers, ie, CNTs, derivatized CNTs, and graphene on the polycarbonate nanocomposite and its application in aerospace, automobile, sports, electronic sectors, and various industries. The comparative analysis of carbon‐based fillers on the different properties of polycarbonate nanocomposites is also included.

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Enhanced electrical properties of polycarbonate/carbon nanotube nanocomposites prepared by a supercritical carbon dioxide aided melt blending method

Cited by 14 publications

References 31 publications

Melt extrudate swell behavior of multi‐walled carbon nanotubes filled‐polypropylene composites

Melt extrudate swell behavior of multi‐walled carbon nanotubes filled‐polypropylene composites

Properties characterisation of polycarbonate and multi‐walled carbon nanotubes composites prepared by solution technique

A review on the mechanical, electrical and EMI shielding properties of carbon nanotubes and graphene reinforced polycarbonate nanocomposites

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