scholarly journals Solution blending preparation of polycarbonate/graphene composite: boosting the mechanical and electrical properties

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 97931-97940 ◽  
Author(s):  
Emanuele Lago ◽  
Peter S. Toth ◽  
Giammarino Pugliese ◽  
Vittorio Pellegrini ◽  
Francesco Bonaccorso
Keyword(s):  
Electrical Conductivity ◽  
Thermal Properties ◽  
Electrical Properties ◽  
Mechanical And Thermal Properties ◽  
Layer Graphene ◽  
Graphene Composite ◽  
Solution Blending ◽  
Mechanical And Electrical Properties ◽  
Graphene Flakes ◽  
Few Layer Graphene

The preparation of polycarbonate-based graphene composites is reported. The loading of single- and few-layer graphene flakes improves the mechanical and thermal properties, as well as the electrical conductivity of the polymer.

scholarly journals Composite Films of Waterborne Polyurethane and Few-Layer Graphene—Enhancing Barrier, Mechanical, and Electrical Properties

2019 ◽  
Vol 3 (2) ◽  
pp. 35
Author(s):  
Eunice Cunha ◽  
Maria Paiva
Keyword(s):  
Electrical Properties ◽  
Aqueous Suspension ◽  
Composite Films ◽  
Spray Coating ◽  
Waterborne Polyurethane ◽  
Free Standing ◽  
Layer Graphene ◽  
Mechanical And Electrical Properties ◽  
Thermal And Electrical Properties ◽  
Few Layer Graphene

Graphene has excellent mechanical, thermal, and electrical properties. Graphene can serve as potential reinforcement in polymer-based nanocomposites. In order to achieve this goal, graphene has to be distributed homogeneously and dispersed throughout the polymer matrix, establishing a strong interface with the polymer. Solution mixing is an interesting method for the preparation of homogeneous nanocomposites, in particular when using environmentally friendly solvents such as water. The major difficulty met in the production of graphene/polymer composites concerns the preparation and stabilization of graphene in aqueous suspension. In the present work three different graphite-based materials, with different crystallinity and purity grades, were exfoliated in aqueous solution of an amphiphilic pyrene derivative, forming few-layer graphene (FLG). The FLG prepared was dispersed in waterborne polyurethane (WPU) to produce composite films. The composite films were produced by solvent casting and spray coating, forming free-standing films that were characterized in terms of its distribution of FLG through the composite, its permeability to water vapor, its electrical resistivity, and its mechanical properties. The studies demonstrated the influence of different factors on the composite film properties such as the use of graphite vs. FLG, the FLG lateral dimensions, and the FLG composition and composite preparation method.

scholarly journals Nanostructured Biopolymer/Few-Layer Graphene Freestanding Films with Enhanced Mechanical and Electrical Properties

2018 ◽  
Vol 303 (4) ◽  
pp. 1700316 ◽  
Author(s):  
Cláudia Silva ◽  
Sofia G. Caridade ◽  
Eunice Cunha ◽  
Maria P. Sousa ◽  
Helena Rocha ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Layer Graphene ◽  
Mechanical And Electrical Properties ◽  
Few Layer Graphene

Electrical properties of polytetrafluoroethylene/few-layer graphene composites fabricated by solid-state processing

2016 ◽  
Vol 51 (18) ◽  
pp. 2565-2573 ◽  
Author(s):  
JY Suh ◽  
SE Shin ◽  
DH Bae
Keyword(s):  
Electrical Conductivity ◽  
Solid State ◽  
Electrical Properties ◽  
Room Temperature ◽  
Three Dimensional ◽  
Powder Surface ◽  
Layer Graphene ◽  
Few Layer Graphene ◽  
State Processing

High electrical performances of polytetrafluoroethylene composites containing few-layer graphenes are established by solid-state processing. Polytetrafluoroethylene and FLG powders are mechanically mixed without solvents at room temperature, and hot-pressed. Few-layer graphenes are attached to the polytetrafluoroethylene powder, and gradually wrap the powder surface during milling with a low milling speed. The few-layer graphene-wrapped polytetrafluoroethylene powders readily facilitate the formation of a continuous few-layer graphene network due to the contact between adjacent few-layer graphene-wrapped powders. The final composites using few-layer graphene-wrapped polytetrafluoroethylene powders include a three-dimensional conducting network. Eventually, the wrapping morphology of the polytetrafluoroethylene/few-layer graphene powder results in a remarkable electrical conductivity of 7353 Sm−1 at 30 vol. %. few-layer graphene loading.

Comparative study of single‐layer graphene and single‐walled carbon nanotube‐filled epoxy nanocomposites based on mechanical and thermal properties

2018 ◽  
Vol 40 (S2) ◽  
pp. E1840-E1849 ◽  
Author(s):  
Muhammad Razlan Zakaria ◽  
Muhammad Helmi Abdul Kudus ◽  
Hazizan Md Akil ◽  
Mohd Zharif Mohd Thirmizir ◽  
Muhammad Fadhirul Izwan Abdul Malik ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Carbon Nanotube ◽  
Comparative Study ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Mechanical And Thermal Properties ◽  
Epoxy Nanocomposites ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Layer Graphene

scholarly journals High Strength Metallurgical Graphene – Mechanisms of Growth and Properties / Grafen Metalurgiczny O Wysokiej Wytrzymałości – Mechanizmy Wzrostu I Właściwości

2015 ◽  
Vol 60 (4) ◽  
pp. 2535-2542 ◽  
Author(s):  
P. Kula ◽  
W. Szymański ◽  
Ł. Kołodziejczyk ◽  
R. Atraszkiewicz ◽  
K. Dybowski ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Chemical Vapor ◽  
High Strength ◽  
Growth Mechanisms ◽  
Key Factors ◽  
Mechanical And Electrical Properties ◽  
Chemical Vapor Deposited ◽  
Graphene Flakes

In this work, the growth mechanisms of chemical vapor deposited and metallurgical graphene and their selected mechanical and electrical properties were investigated. The study revealed the influence of the growth mechanisms on monoand poly-crystalline nanostructures of synthesized graphene monolayers. The structure of flake boundaries greatly affects both the mechanical and electrical properties. The key factors are overlapping of the graphene flakes, their degree of mismatch and the presence of π type bonds. All of these issues should be taken into account when developing industrially scaled technologies for graphene manufacturing.

Tunable Phase Shifter Based on Few-Layer Graphene Flakes

2019 ◽  
Vol 29 (1) ◽  
pp. 47-49 ◽  
Author(s):  
Muhammad Yasir ◽  
Silvia Bistarelli ◽  
Antonino Cataldo ◽  
Maurizio Bozzi ◽  
Luca Perregrini ◽  
...  
Keyword(s):  
Phase Shifter ◽  
Layer Graphene ◽  
Graphene Flakes ◽  
Few Layer Graphene

Mechanical and Electrical Properties of Carbon Nanotube / Polydimethylsiloxane Composites Yarn

2016 ◽  
Vol 11 (4) ◽  
pp. 155892501601100 ◽  
Author(s):  
Wei Liu ◽  
Fujun Xu ◽  
Nianhua Zhu ◽  
Shuang Wang
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
Strain Sensors ◽  
Electromechanical Properties ◽  
Average Strength ◽  
Mechanical And Electrical Properties ◽  
Carbon Nano Tube ◽  
Droplet Infiltration

Carbon nano tube (CNT) yarn is an axially aligned CNT assembly. It has great potential many applications. In this study, the mechanical and electrical properties of the aerogel-spun CNT yarns and CNT/Polydimethylsiloxane (PDMS) composite yarns were investigated. The CNT/PDMS yarn was fabricated by droplet infiltration of PDMS solution into the aerogel-spun CNT yarn. The mechanical properties of the CNT/PDMS yarns were significantly improved with an average strength of 837.29 MPa and modulus of 3.66 GPa, over 100% improvement compared to the original CNT yarns. The electrical conductivity of the CNT/PDMS yarn increased from 1636 S/cm to 3555 S/cm. The electromechanical properties of CNT/PDMS yarns demonstrated that such CNT yarn could be suitable for strain sensors.

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