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Proceedings Paper

Structure of carbon black-elastomer composites by small-angle neutron scattering and the method of contrast variation
Author(s): Rex P. Hjelm; Wesley Wampler; Michel Gerspacher
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Paper Abstract

We have been exploring the use of small-angle neutron scattering and the method of contrast variation to give a new look at very old problem--reinforcement of elastomers by carbon black in durable rubber products. Carbon black has a hierarchy of structures consisting of particles covalently bound into aggregates, which in turn associate by weak interactions into agglomerates. We found that in one carbon black, HSA, the aggregates are rod-like, containing an average of 4-6 particles. The aggregates have another graphitic shell and an inner core of lower density carbon. The core is continuous throughout the carbon black aggregate. Contrast variation of swollen HSA-polyisoprene gels shows that the HSA is completely embedded in polyisoprene and that the agglomerates are formed predominantly by end on associations of the rod-like aggregates. The surface structure of the carbon black appears smooth over length scales above about 10 angstrom. Further studies using production carbon blacks suggest that these structural characteristics are generally present in commercial rubber composites.

Paper Details

Date Published: 27 February 1997
PDF: 4 pages
Proc. SPIE 2867, International Conference Neutrons in Research and Industry, (27 February 1997); doi: 10.1117/12.267886
Show Author Affiliations
Rex P. Hjelm, Los Alamos National Lab. (United States)
Wesley Wampler, Sid Richardson Carbon Co. (United States)
Michel Gerspacher, Sid Richardson Carbon Co. (United States)


Published in SPIE Proceedings Vol. 2867:
International Conference Neutrons in Research and Industry
George Vourvopoulos, Editor(s)

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