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The Significance of Percolation on the Dynamics of Polymer Chains Bound to Carbon Black

Published online by Cambridge University Press:  21 March 2011

Alan I. Nakatani ,
Robert Ivkov ,
Peter Papanek ,
Catheryn L. Jackson ,
Henry Yang ,
Leszek Nikiel  and
Michel Gerspacher
Alan I. Nakatani
Affiliation:
National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
Robert Ivkov
Affiliation:
NIST Center for Neutron Research National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
Peter Papanek
Affiliation:
NIST Center for Neutron Research National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899 Department of Materials Science, University of PennsylvaniaNational Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
Catheryn L. Jackson
Affiliation:
National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
Henry Yang
Affiliation:
Sid Richardson Carbon Company, Fort Worth, TX 76106 National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
Leszek Nikiel
Affiliation:
Sid Richardson Carbon Company, Fort Worth, TX 76106 National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
Michel Gerspacher
Affiliation:
Sid Richardson Carbon Company, Fort Worth, TX 76106 National Institute of Standards and Technology, Polymers Division, Gaithersburg, MD 20899
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Extract

A critical need in the fundamental understanding of reinforcement in filled polymers is the characterization of the polymer-filler interface and the dynamics of the polymer in this interfacial regime. In carbon black filled polymers, one of the central themes in the mechanism of reinforcement is that of “bound” polymer. Understanding the dynamics of this bound polymer may be key to arriving at an understanding of reinforcement mechanisms in filled polymers. The interactions between polymers and filler surfaces are also key in the development of more advanced nanocomposite materials.

We have previously utilized inelastic neutron scattering methods to examine the variation of bound polymer dynamics as a function of carbon black type for a single, initial carbon black concentration. An apparent change in the distribution in backbone motions was observed in the bound polymer compared with the pure polymer. In this study, we extend our prior work to examine the bound polymer dynamics as a function of the type of carbon black and the initial concentration of carbon black. The results suggest that two types of dynamic behavior are observed as a function of the initial carbon black concentration. This critical cutoff concentration may be related to the percolation threshold of the carbon black and suggests that quantifying the amount of bound polymer is insufficient for understanding the relationship between mechanical behavior and bound polymer content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 661: Symposium KK – Filled & Nanocomposite Polymer Materials , 2000 , KK4.2
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

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