Estimation of Surface Free Energy of Oxidized Carbon Black.

Asai, Shigeo; Sakata, Kazuya; Sumita, Masao; Miyasaka, Keizo; Sawatari, Atsushi

doi:10.1246/nikkashi.1991.1672

Cited by 7 publications

(3 citation statements)

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“…But better dispersion of the filler in the matrix leads to some delay in the conductive network formation through particle aggregation. Further, some of these active chemical groups on the filler surfaces have a tendency to arrest electrons and thus increase the resistivity of the CB 27. The treated filler increased the resistivity of the composite in comparison to the untreated filler at the some filler loadings.…”

Section: Resultsmentioning

confidence: 99%

Effect of filler treatment and crosslinking on mechanical and dynamic mechanical properties and electrical conductivity of carbon black‐filled ethylene–vinyl acetate copolymer composites

Das

Chaki

Khastgir

2003

J of Applied Polymer Sci

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Mechanical, dynamic mechanical, and electrical conductivity of conductive carbon black-filled ethylene-vinyl acetate (EVA; 28% VA) composites were investigated. The above-mentioned properties were also measured when carbon black was treated with nitric acid before addition to the EVA matrix. It was found that acid-treated carbon black exhibits a higher filler-polymer interaction and this was reflected in the improvement of the mechanical properties and the modification of electrical conductivity of these composites, especially when measured against the temperature. The effect of curing of the polymer matrix on the mechanical properties and electrical conductivity was also investigated. It was found that the introduction of crosslinks in the polymer matrix improves its mechanical properties as well as the thermal stability of its electrical conductivity. The electrical conductivity of ethylene propylene diene (EPDM) and an EVA-EPDM (50/50) blend filled with carbon black were also studied for comparison.

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Section: Resultsmentioning

confidence: 99%

Effect of filler treatment and crosslinking on mechanical and dynamic mechanical properties and electrical conductivity of carbon black‐filled ethylene–vinyl acetate copolymer composites

Das

Chaki

Khastgir

2003

J of Applied Polymer Sci

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“…Surface Energy of Carbon Particles. The surface composition of CB and VGCF has been studied by XPS. , The oxygen content on the CB (Seast 300) surface was found to be approximately 0.9 wt %. The VGCF surface has almost the same level of oxygen content (approximately 0.7 wt %).…”

Section: Resultsmentioning

confidence: 99%

Entropy Penalty-Induced Self-Assembly in Carbon Black or Carbon Fiber Filled Polymer Blends

et al. 2001

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This work attempts to clarify the influence of surface roughness on the thermodynamic interactions between carbon particles and polymer melts. The surface energy of carbon black (CB) and short carbon fibers (VGCF) having different surface roughnesses was estimated by inverse gas chromatography (IGC) and highly sensitive isothermal calorimeter (HS-ITC) measurements using lowmolecular-weight analogues of polymers as probes. We confirmed that the carbon surfaces possess energetic heterogeneity with the most active sites at the graphite crystalline edges, and the interactions in play are van der Waals in nature. Competitive adsorption of two chemically different polymers by incorporation of the carbon particles into the polymer blends was investigated based on SEM and TEM observations. We found that the selective location of CB in the polymer blends does not always depend on the surface tension of polymers but seems to be governed largely by the flexibility of the polymer chains. In VGCFfilled HDPE/PMMA composites, a self-assembled VGCF/HDPE network throughout the PMMA matrix was observed where the flexible HDPE chains are preferentially absorbed at the rough ends of the VGCF filaments. These experimental results lead to the conclusion that surface roughness strongly affects the carbon-polymer interactions, and the entropy penalty may play a main role in competitive adsorption of polymers on the rough carbon surfaces.

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“…It is seen that treatment with both nitric acid and titanate coupling agent increased the fractions of hydroxy, but maintained almost the same amount of the oxygen-containing functional groups CAO and OOCOO. The carboxyl fraction of nitric acid-treated CB was also increased, which factually contributed to a rise in polar components of surface-free energy 22 and formed a striking contrast to the lower value of the titanate coupling agent-treated version. In consideration of the data in Table III, it is evident that carboxyl on CB should be responsible for the previously described variation in RT and M .…”

Section: Effect Of Cb Treatmentsmentioning

confidence: 99%

Carbon-black-filled polyolefine as a positive temperature coefficient material: Effect of composition, processing, and filler treatment

Yu¹,

Zhang²,

Zeng³

1998

J. Appl. Polym. Sci.

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ABSTRACT:Polymer-based positive temperature coefficient (PTC) composites are of special interest because they have great potential in temperature-sensitive devices. To obtain a reproducible PTC composite with acceptable PTC intensity, effect of conductive filler content, processing conditions and filler treatment with nitric acid, and titanate coupling agents on room temperature resistivity and PTC intensity of carbon-blackfilled low-density polyethylene composites have been described and discussed herein. The results showed that filler arrangement is a key factor influencing the ultimate material performance, which can be tailored in various ways.

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Estimation of Surface Free Energy of Oxidized Carbon Black.

Cited by 7 publications

References 0 publications

Effect of filler treatment and crosslinking on mechanical and dynamic mechanical properties and electrical conductivity of carbon black‐filled ethylene–vinyl acetate copolymer composites

Effect of filler treatment and crosslinking on mechanical and dynamic mechanical properties and electrical conductivity of carbon black‐filled ethylene–vinyl acetate copolymer composites

Entropy Penalty-Induced Self-Assembly in Carbon Black or Carbon Fiber Filled Polymer Blends

Carbon-black-filled polyolefine as a positive temperature coefficient material: Effect of composition, processing, and filler treatment

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