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Dynamics of Nanoparticle Chain Aggregates of Carbon Under Tension

Published online by Cambridge University Press:  10 February 2011

Rajdip Bandyopadhyaya ,
Weizhi Rong ,
Yong J. Suh  and
Sheldon K. Friedlander
Rajdip Bandyopadhyaya
Affiliation:
Department of Chemical Engineering, University of California at Los Angeles, Los Angeles, California 90095, U.S.A.
Weizhi Rong
Affiliation:
Department of Chemical Engineering, University of California at Los Angeles, Los Angeles, California 90095, U.S.A.
Yong J. Suh
Affiliation:
Department of Chemical Engineering, University of California at Los Angeles, Los Angeles, California 90095, U.S.A.
Sheldon K. Friedlander
Affiliation:
Department of Chemical Engineering, University of California at Los Angeles, Los Angeles, California 90095, U.S.A.
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Abstract

Carbon black in the form of nanoparticle chains is used as a reinforcing filler in elastomers. However, the dynamics of the filler particles under tension and their role in the improvement of the mechanical properties of rubber are not well understood. We have studied experimentally the dynamics of isolated nanoparticle chain aggregates (NCAs) of carbon made by laser ablation, and also that of carbon black embedded in a polymer film. In situ studies of stretching and contraction of such chains in the transmission electron microscope (TEM) were conducted under different maximum values of strain. Stretching causes initially folded NCA to reorganize into a straight, taut configuration. Further stretching leads to either plastic deformation and breakage (at 37.4% strain) or to a partial elastic behavior of the chain at small strains (e.g. 2.3% strain). For all cases the chains were very flexible under tension. Similar reorientation and stretching was observed for carbon black chains embedded in a polymer film. Such flexible and elastic nature of NCAs point towards a possible mechanism of reinforcement of rubber by carbon black fillers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 778: Symposium U – Mechanical Properties Derived from Nanostructuring Materials , 2003 , U4.4
Copyright
Copyright © Materials Research Society 2002

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