The Effect of Compressive Strain and Stress on Electrical Conductivity of Conductive Rubber Composites

2000 ◽  
Vol 73 (2) ◽  
pp. 310-324 ◽  
Author(s):  
K. P. Sau ◽  
T. K. Chaki ◽  
D. Khastgir
Keyword(s):  
Electrical Conductivity ◽  
Compressive Strain ◽  
Filler Loading ◽  
Stress And Strain ◽  
Conductive Network ◽  
Rubber Composites ◽  
Conductive Rubber ◽  
Ethylene Propylene Diene Rubber ◽  
Conductive Silicone Rubber ◽  
Diene Rubber

Abstract The electrical conductivity changes significantly when compressive strain and stress are applied on the conductive rubber composites derived from acrylonitrile—butadine rubber (NBR), ethylene—propylene—diene rubber (EPDM) and their 50:50 blend. The resistivity increases during application of compressive strain. However, the change of electrical resistivity depends on strain amplitude, amount of filler loading and type of polymer matrix. The change of resistivity with time for compressed samples has also been registered. But, during application of compressive stress (pressure), the resistivity is found to decrease for NBR and increase for EPDM and dual behavior is observed in blend. All the increase and decrease of resistivity with the application of stress and strain is explained on the basis of formation and destruction of a conductive network, which further depends on viscosity (stiffness) of the matrices. The observations are supported by the similar experiments with conductive silicone rubber composites.

Carbon nanodots as an eco-friendly activator of sulphur vulcanization in diene-rubber composites

2021 ◽  
Vol 25 ◽  
pp. 100755
Author(s):  
Siwu Wu ◽  
Chong Xiao ◽  
Shaoxin Kong ◽  
Bo Li ◽  
Zhijun Yang ◽  
...  
Keyword(s):  
Carbon Nanodots ◽  
Rubber Composites ◽  
Sulphur Vulcanization ◽  
Diene Rubber

scholarly journals Predicting the behavior of reinforced concrete columns confined by fiber reinforced polymers using data mining techniques

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Sahar Y. Ghanem ◽  
Heba Elgazzar
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Compressive Stress ◽  
Compressive Strain ◽  
Concrete Columns ◽  
Steel Reinforcement ◽  
Fiber Reinforced Polymers ◽  
Stress And Strain ◽  
Fiber Reinforced ◽  
The Impact

AbstractFiber Reinforced Polymer (FRP) usage to wrap reinforced concrete (RC) structures has become a popular technology. Most studies about RC columns wrapped with FRP in literature ignored the internal steel reinforcement. This paper aims to develop a model for the axial compressive strength and axial strain for FRP confined concrete columns with internal steel reinforcement. The impact of FRP, Transverse, and longitudinal reinforcement is studied. Two non-destructive analysis methods are explored: Artificial Neural Networks (ANNs) and Regression Analysis (RA). The database used in the analysis contains the experimental results of sixty-four concrete columns under the compressive concentric load available in the literature. The results show that both models can predict the column's compressive stress and strain reasonably with low error and high accuracy. FRP has the highest effect on the confined compressive stress and strain compared to other materials. While the longitudinal steel actively contributes to the compressive strength, and the transverse steel actively contributes to the compressive strain.

Heterogeneous Preparation of Cellulose/Ag/Polyaniline Conductive Composite and its Electrical Property

2012 ◽  
Vol 182-183 ◽  
pp. 254-258
Author(s):  
Zhong Li Zhao ◽  
Zun Li Mo ◽  
Zhong Yu Chen
Keyword(s):  
Electrical Conductivity ◽  
Electrical Property ◽  
Conductive Network ◽  
High Electrical Conductivity ◽  
Electrically Conductive ◽  
Conductive Composite

Cellulose/Ag/polyaniline conductive composite with rather excellent electrical conductivity was heterogeneously synthesized in this paper. The UV-Vis analysis indicated that homogeneous nanoAg particles deposited on the surface of cellulose in the form of globe particles. They offered some electrons to polyaniline chains. This behavior resulted to the facts that more polyaniline embedded on cellulose and an integrated electrically conductive network formed. Consequently, the high electrical conductivity of the composite was observed. The value was 3.48 S/cm, which was higher two magnitudes than the electrical conductivity of cellulose/polyaniline composite (2.15×10-2S/cm), and even was higher than the electrical conductivity of pure polyaniline (0.142 S/cm). This paper provided a facile method for the preparation of cellulose/Ag/ polyaniline composite with favorable electrical conductivity.

Preparation of Polymer Composite Bipolar Plate with Different Multi-Filler for Polymer Electrolyte Membrane Fuel Cell (PEMFC)

2014 ◽  
Vol 699 ◽  
pp. 689-694 ◽  
Author(s):  
Mohd Zulkefli Selamat ◽  
Mohd Shakir Ahmad ◽  
Mohd Ahadlin Mohd Daud ◽  
Musthafa Mohd Tahir ◽  
Safaruddin Gazali Herawan
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Alternative Energy ◽  
Polymer Electrolyte Membrane ◽  
Energy System ◽  
Bipolar Plate ◽  
Filler Loading ◽  
Shore Hardness ◽  
Electrolyte Membrane

Polymer Electrolyte Membrane Fuel Cell (PEMFC) is an alternative energy system that has been verified with great potential for high power density, durability and cost effectiveness. Since the bipolar plate is the key component in PEMFC, the component must operate with multifunction and have a balance of properties, essentially well in both electrical and mechanical properties. At present, many different materials have been tested to be applied for bipolar plate in order to fulfill the balance in each property. In this work, the different material is tested and observed. Polypropylene (PP) is used as a binder material, Graphite (Gr) is used as a main filler and Carbon Black (CB), Iron (Fe) and Nickel (Ni) as the second filler. This composite is produced through compression molding and the effect of different filler material loading on the properties such as electrical conductivity, flexural strength, bulk density and shore hardness are observed. The result showed the increasing of electrical conductivity as the increased the CB and Fe loading. But for Ni, the result showed the decreasing of electrical conductivity as the loading of Ni has been increased. The targeted value also achieved for some certain degree of filler loading.

A copper-(lignin/silica/fatty acids) complex as an antioxidant/electrical conductivity agent for rubber composites (Part iii)

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hoda Sabry Othman ◽  
Maher A. El-Hashash ◽  
S. H. El-Sabbagh ◽  
A. A. Ward ◽  
Galal A.M. Nawwar
Keyword(s):  
Electrical Conductivity ◽  
Antioxidant Activity ◽  
Design Methodology ◽  
Black Liquor ◽  
Coupling Agents ◽  
Rheological Characteristics ◽  
Rubber Composites ◽  
Content Type ◽  
Mechanical And Electrical Properties ◽  
Antioxidant Additives

Purpose Calcium and Zinc lignates were proven to be good antioxidants for rubber composites. The purpose of this paper is to evaluate the copper lignate antioxidant activity along with evaluating its electrical conductivity in rubber composites. Design/methodology/approach The antioxidant activity of the Cu-LSF complex was compared with that of standard commercial antioxidant additives as a green alternative. The rheological characteristics, thermal aging and mechanical and electrical properties were evaluated for the NBR vulcanizates containing the different antioxidants in the presence or absence of coupling agents. Findings Results revealed that the Cu-LSF complex (5 phr) can function as a compatibilizing, antioxidant and electrical conductivity agent. Originality/value The new copper complex prepared from paper-pulping black liquor of wastes could be used as a green antioxidant and electrical conductivity agent in rubber composites.

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