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Plasma Polymerized Primers for Rubber to Metal Bonding: Characterization of the Interphase

Published online by Cambridge University Press:  15 February 2011

Y. M. Tsai ,
F. J. Boerio  and
Dong K. Kim
Y. M. Tsai
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012
F. J. Boerio
Affiliation:
Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, Ohio 45221-0012
Dong K. Kim
Affiliation:
The Goodyear Tire & Rubber Co., Akron, Ohio 44309-3531
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Abstract

Plasma polymerized acetylene films contained mono- and di-substituted acetylene groups, aromatic groups, and carbonyl groups which resulted from reaction of residual free radicals with oxygen when the films were exposed to the atmosphere. There was some evidence for formation of acetylides in the interphase between the films and the substrates. Reactions occurring in the interphase between the plasma polymerized films and natural rubber were simulated using a model rubber compound consisting of a mixture of squalene, zinc oxide, carbon black, sulfur, stearic acid, diaryl-p-diphenyleneamine, and N,N-dicyclohexylbenzothiazole sulfenamide (DCBS). Zinc oxide and cobalt naphthenate reacted with stearic acid to form zinc and cobalt stearates. The stearates reacted with the benzothiazole sulfonamide moiety of DCBS and with sulfur to form zinc and cobalt accelerator complexes and perthiomercaptides. The complexes and perthiomercaptides reacted with squalene and the plasma polymer to form pendant groups which eventually disproportionated to form crosslinks between squalene and the primer. Migration of double bonds during reaction of the model rubber compound with the films resulted in formation of conjugated double bonds in squalene.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 385: Symposium N – Polymer/Inorganic Interfaces II , 1995 , 125
Copyright
Copyright © Materials Research Society 1995

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References

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