The conductive property of polyurethane/expanded graphite powder composite foams

2011 ◽  
Vol 30 (9) ◽  
pp. 757-761 ◽  
Author(s):  
Danqing Chen ◽  
Guohua Chen
Keyword(s):  
Expanded Graphite ◽  
Graphite Powder ◽  
Powder Composite ◽  
Composite Foams ◽  
Conductive Property

Fabrication Polyurethane/Expanded Graphite Powder Composite Antistatic Sponge by In Situ Polymerization

2012 ◽  
Vol 479-481 ◽  
pp. 395-398
Author(s):  
Dan Qing Chen
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
In Situ Polymerization ◽  
Expanded Graphite ◽  
Graphite Powder ◽  
Polymeric Matrix ◽  
Powder Composite

This document explains and demonstrates how to prepare Polyurethane(PU)/Expanded Graphite powder(EGp) composite antistatic sponge by in situ polymerization. The morphology、mechanical、electrical and thermal properties of the PU/EGp composite antistatic sponge have been investigated. PU/ EGp composite sponge have better mechanical properties than that of CB composite. The resistivity of PU/EGp composite antistatic sponge can reach at about 108Ω•cm at the content around 5wt% of the EGp. EGp can stably exist in PU sponge and has little influence to the polymeric matrix while being heated.

Preparation of Expanded Graphite and Graphite Nanosheets for Improving Electrical Conductivity of Polyester Coating Films

2021 ◽  
Vol 21 (12) ◽  
pp. 5846-5858
Author(s):  
Yun Ding ◽  
Mingxia Tian ◽  
Aili Wang ◽  
Hengbo Yin
Keyword(s):  
Electrical Conductivity ◽  
Thermal Expansion ◽  
Milling Time ◽  
Expanded Graphite ◽  
Graphite Powder ◽  
Expandable Graphite ◽  
Coating Films ◽  
Natural Graphite ◽  
Graphite Nanosheets ◽  
Volumetric Rate

Expanded graphite and graphite nanosheets were facilely prepared by the thermal expansion of expandable graphite at 800 °C and sand milling of expanded graphite in water, respectively. When the expandable graphite precursor was prepared by the oxidation and intercalation of natural graphite (5 g) using KMnO4 (6 g) as an oxidant in a concentrated sulfuric acid solution (120 mL) at room temperature (25 °C) for 8 h, the expanded graphite with a maximum volumetric rate of 317 mL g−1 was prepared after the thermal expansion of the expandable graphite precursor at 800 °C for 60 s. The oxidation extent of natural graphite with KMnO4 is crucial for the preparation of expanded graphite. The thicknesses of graphite nanosheets decreased from 8.9 to 3.2 nm when the sand milling time of the expanded graphite in deionized water was prolonged from 6 to 24 h. The prolonging of the sand milling time not only decreased the layer number of the graphite nanosheet but also increased the d002 spacing due to the shocking and shearing forces. The addition of the expanded graphite powder and graphite nanosheets in a polyester paint efficiently improved the electrical conductivity of the resultant polyester coating films.

Thermal Properties of Epoxy Based Expanded Graphite Composite for Bipolar Plate of Polymer Electrolyte Fuel Cells

2010 ◽  
Vol 123-125 ◽  
pp. 1107-1110 ◽  
Author(s):  
Jae Young Lee ◽  
Ji Jung Lee ◽  
Hyung Ryul Rhim ◽  
Joong Pyo Shim ◽  
Hong Ki Lee
Keyword(s):  
Thermal Properties ◽  
Polymer Electrolyte ◽  
Expanded Graphite ◽  
Graphite Powder ◽  
Bipolar Plate ◽  
Polymer Electrolyte Fuel Cell ◽  
Molding Pressure ◽  
Graphite Composite ◽  
Graphite Content ◽  
Electrical Vehicles

The application of polymer electrolyte fuel cell (PEMFC) to the electrical vehicles is restricted by high material cost and complicated manufacturing process. The epoxy based graphite composite has been prepared with various additives. The possibility for bipolar plate material at PEMFC was investigated by electrical and thermal properties. Density of bipolar plate with graphite composite was decreased from 5.40 to 2.57 as 80 w/o of graphite content were changed to 50 w/o of graphite content and 30 w/o of expanded graphite. The percolation thresholds showed around 75 w/o of graphite content was varied by molding pressure. From the TGA analysis, the glass transition temperatures were shown around 250 degrees and less that 3% of weight loss was found at 150 degree. The surface conductivity of epoxy/graphite bipolar plate showed from 4.5 S/cm to 87 S/cm and the highest value of conductivity was obtained using expanded graphite powder only. The improvement of thermal stability and electrical properties was accomplished by addition of expanded graphite powder.

scholarly journals A Cost-Effective Method for Preparing Robust and Conductive Superhydrophobic Coatings Based on Asphalt

Scanning ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Wenbin Li ◽  
Yong Wang ◽  
Yanting Feng ◽  
Qing Wang ◽  
Xuexia Xu ◽  
...  
Keyword(s):  
Expanded Graphite ◽  
Cost Effective ◽  
Graphite Powder ◽  
Superhydrophobic Coatings ◽  
Cost Effective Method ◽  
The Hierarchical Structure ◽  
Grid Applications ◽  
Self Similar ◽  
Ground Grid ◽  
Spraying Method

The wide application of superhydrophobic materials is mainly hindered by the poor mechanical robustness and complicated preparation method. To overcome these problems, we tried to make a combination of hierarchical and self-similar structure by the means of a simple spraying method. By adding nanofiller (carbon nanotube) and microfiller (graphite powder and expanded graphite), the hierarchical structure was constructed. By further doping the fillers in the commercial asphalt uniformly, the self-similar structure was prepared. Based on the aforementioned work, the as-prepared sample could withstand the sandpaper abrasion for 12.00 m under 4.90 kPa. Moreover, this superhydrophobic coating demonstrated good conductivity, superior self-cleaning property, and excellent corrosion resistance. The integration of conductivity with the superhydrophobicity might open new avenues for ground grid applications.

scholarly journals Effects of electron beam irradiation on characteristic properties of expanded graphite

2021 ◽  
Vol 11 (1) ◽  
pp. 26-34
Author(s):  
Thu Hong Pham Thi ◽  
Thanh Duoc Nguyen ◽  
Thi Ly Nguyen ◽  
Nhut Khanh Chu ◽  
Van Chung Cao ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Expanded Graphite ◽  
Graphite Powder ◽  
Microwave Treatment ◽  
The Self ◽  
Beam Irradiation ◽  
Beam Radiation ◽  
Electron Beam Radiation ◽  
Before And After

Vietnamese graphite powder was irradiated by electron beam radiation (EB) at a range of dose from 0 to 120 kGy, then the graphite samples were expanded with a mixture of H2O2:H2SO4 (1,4:20, v/v) incorporating microwave treatment at 700 W for 30 seconds. The characteristic properties of graphite before and after expansion were evaluated by methods of FTIR, Raman, SEM and XRD. Besides the self-assembled of the graphite’s structure after irradiation, the electron beam radiation also facilitated intercalation processing to make expanded graphite, with coefficient of expansion (Kv) 35% higher than that of pristine graphite.

Insights into the physical properties of biobased polyurethane/expanded graphite composite foams

2017 ◽  
Vol 138 ◽  
pp. 24-31 ◽  
Author(s):  
Nuno Gama ◽  
Luis Cadillon Costa ◽  
Vitor Amaral ◽  
Artur Ferreira ◽  
Ana Barros-Timmons
Keyword(s):  
Physical Properties ◽  
Expanded Graphite ◽  
Graphite Composite ◽  
Composite Foams ◽  
Biobased Polyurethane
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