scholarly journals Electric Modulus Analysis of Carbon Black/Copolymer Composite Materials

2011 ◽  
Vol 02 (10) ◽  
pp. 1421-1426 ◽  
Author(s):  
Mohamed El Hasnaoui ◽  
Manuel Pedro Fernanades Graça ◽  
Mohammed Essaid Achour ◽  
Luís Cadillon Costa
Keyword(s):  
Composite Materials ◽  
Carbon Black ◽  
Electric Modulus ◽  
Modulus Analysis

Effect of Carbon Black Addition on the Rheology Properties of Electrically Conductive PP-Graphite Composite

2011 ◽  
Vol 233-235 ◽  
pp. 3057-3063 ◽  
Author(s):  
Yovial Mahyoedin ◽  
Jaafar Sahari ◽  
Andanastuti Mukhtar ◽  
Norhamidi Mohammad
Keyword(s):  
Activation Energy ◽  
Composite Materials ◽  
Carbon Black ◽  
Injection Molding ◽  
Solid Loading ◽  
Molding Machine ◽  
Injection Molding Machine ◽  
Graphite Composite ◽  
Twin Screw ◽  
Varied Composition

This investigation gives attention on the rheology characteristics of polymer composites based on graphite and carbon black as fillers for further processing using an injection molding machine. In such a high solid loading system, the particles exhibit a very strong tendency toward agglomeration. This rapidly increases the viscosity of the mixture and decreases moldability. The presence of agglomerates in the mixture in particular may result in defect within the microstructure in the final product, even though it is sometime necessary in electrical conductivity. Composite materials in this study are polypropylene (PP) as matrix, and graphite (G) and carbon black (CB) as fillers, with a varied composition according to the percentage weight (% wt) of CB. Twin screw co-rotating extruder was used for mixing materials in order to achieve the best homogeneity of this compound. The measurement results obtained using capillary rheometer equipment showed that the addition of CB to the mixture of PP/G increase the viscosity of the materials, increase the activation energy and generally reduce the fluidity of composite materials. The value of the mixture viscosity increases with increasing the number of CB, reducing the ability of materials to be formed (moldability). Material viscosity, activation energy, fluidity and moldability shows how suitable the compound material to be processed by using injection molding machine.

scholarly journals Variation of Solvent Scattering-Length Density in Small-Angle Neutron Scattering as a Means of Determining Structure of Composite Materials

1994 ◽  
Vol 376 ◽  
Author(s):  
Rex P. Hjelm ◽  
Wesley Wampler ◽  
Michel Gerspacher
Keyword(s):  
Composite Materials ◽  
Carbon Black ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Scattering Length ◽  
Contrast Variation ◽  
Length Scales ◽  
Excluded Volume Effects ◽  
Component Form

ABSTRACTAs part of our work on the structure of composite materials we have been exploring the use of small-angle neutron scattering using the method of contrast variation to dissect the component form, structure and distribution. This approach has resulted in a new look at very old problemreinforcement of elastomers by carbon black.Using this approach we studied an experimental high surface area (HSA) carbon black and a gel of "HSA-bound" rubber in cyclohexane/deuterocyclohexane mixtures. HSA in cyclohexane is found to be short rodlike particle aggregates. The aggregates have a shell-core structure with a high density graphitic outer shell and an inner core of lower density amorphous carbon. The core is continuous throughout the carbon black aggregate, making the aggregate a stiff, integral unit. Contrast variation of swollen composite gels shows that there are two length scales in the gel structure. Above 10 Å, scattering from carbon black predominates, and below 10 Å the scattering is from both carbon black and the elastomer. The HSA in the composite is completely embedded in polyisoprene. An estimate of the carbon black structure factor shows strong exclusion of neighboring aggregates, probably from excluded volume effects. The surface structure of the carbon black is unaltered by the interactions with elastomer and appears smooth over length scales above about 10 Å. These results show that contrast variation can provide information on composite structure that is not available by other means. This information relates to the reinforcement mechanism of elastomers by carbon blacks.

Impedance and electric modulus analysis of Sm-modified Pb(Zr0.55Ti0.45)1−x/4O3 ceramics

2011 ◽  
Vol 509 (22) ◽  
pp. 6388-6394 ◽  
Author(s):  
Rajiv Ranjan ◽  
Rajiv Kumar ◽  
Nawnit Kumar ◽  
Banarji Behera ◽  
R.N.P. Choudhary
Keyword(s):  
Electric Modulus ◽  
Modulus Analysis

Effects of cutting parameters on drilling performance of carbon black–reinforced polymer composite

2016 ◽  
Vol 232 (7) ◽  
pp. 1133-1142 ◽  
Author(s):  
Alper Uysal
Keyword(s):  
Surface Roughness ◽  
Composite Materials ◽  
Carbon Black ◽  
Polymer Composite ◽  
Experimental Studies ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Polymer Materials ◽  
Drill Point

Polymer composite materials can be produced by reinforcing carbon black, carbon fiber, graphite, graphene, metals and metal oxides, nanotubes, and so on. These types of composite materials can be employed in applications demanding electrical conductivity besides high specific strength and stiffness properties of polymer materials. In the literature, there is a lack of knowledge on the examination of drilling of particle-reinforced composite materials. In this study, drilling of pure polypropylene and carbon black–reinforced polypropylene composite material was investigated at different drill point angles, cutting speeds, and feeds. The cutting temperature of drill point and surface roughness of holes were examined. The experimental studies were designed by L27 full-factorial design, and analysis of variance statistical method was performed. According to the results, cutting temperature increased and surface roughness decreased with the increase in the cutting speed and feed and decrease in the drill point angle.

Effect of RuO2 on Piezoresistive Properties of CB/MVQ Composite Materials

2014 ◽  
Vol 609-610 ◽  
pp. 124-129
Author(s):  
Ju Ying Wu ◽  
Jing Hui Fan ◽  
Yu Hong Huang ◽  
Jing Guo ◽  
Kai Zhang
Keyword(s):  
Composite Materials ◽  
Carbon Black ◽  
Silicone Rubber ◽  
Oxidation Reaction ◽  
Resistance Testing ◽  
Test Results ◽  
Sem And Tem ◽  
Pressure Resistance ◽  
The Stability

In this paper, RuO2-CB/MVQ composites were prepared through following steps. First, the nanoruthenium particles had been prepared by solvent thermo-deoxidization ways. Secondly, the nanoRuO2 particles had been formed by oxidation reaction of nanoruthenium particles in air. Thirdly, the carbon black/silicone rubber mixed rubber was prepared by solvent mixing. Fourthly, the nanoruthenium particles were mixed into carbon black/silicone rubber mixed rubber by rubbing dispersion. Finally, vulcanization molding was carried out at certain preasure and temperature. The piezoresistive properties of CB/MWQ composite materials were tested with pressure-resistance testing systems designed ourselves. The test results showed that suitable amounts of RuO2 could enhance the stability and creep of piezoresistive properties of CB/MWQ composite materials. The microstructure of CB/MWQ composite materials were analyzed with SEM and TEM. The characterization results showed that nanoRuO2 particles dispersed in composite materials in nanolevel. These nanostructure could improve conductive net of carbon black, and reinforce crosslink net of silicone rubber. These factors had advantage to the stability of piezoresistive properties of CB/MWQ composite materials.

Dielectric relaxation in carbon black-epoxy composite materials

2008 ◽  
Vol 103 (9) ◽  
pp. 094103 ◽  
Author(s):  
M. E. Achour ◽  
C. Brosseau ◽  
F. Carmona
Keyword(s):  
Composite Materials ◽  
Carbon Black ◽  
Dielectric Relaxation ◽  
Epoxy Composite

scholarly journals Ac conductivity, electric modulus analysis, dielectric behavior and Bond Valence Sum analysis of Na3Nb4As3O19 compound

2020 ◽  
Vol 13 (6) ◽  
pp. 5627-5638
Author(s):  
Saïda Fatma Chérif ◽  
Amira Chérif ◽  
Wassim Dridi ◽  
Mohamed Faouzi Zid
Keyword(s):  
Ac Conductivity ◽  
Electric Modulus ◽  
Dielectric Behavior ◽  
Bond Valence ◽  
Modulus Analysis ◽  
Bond Valence Sum
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