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Amine-Quinone Polyimides as Coatings that Protect Iron Against Corrosion.

Published online by Cambridge University Press:  01 February 2011

Mijeong Han ,
Huimin Bie ,
Garry W. Warren  and
David E. Nikles
Mijeong Han
Affiliation:
Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487–0209
Huimin Bie
Affiliation:
Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487–0209
Garry W. Warren
Affiliation:
Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487–0209
David E. Nikles
Affiliation:
Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487–0209
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Abstract

A new diamine monomer was synthesized by condensing 4,4'-methylene dianiline with 1,4-benzoquinone. The monomer was condensed with 3,3',4,4'-benzophenone tetracarboxylic dianhydride to give a polyamic acid that was soluble in N-methyl-2-pyrrolidinone. The polyamic acid was cast onto iron and thermally imidized to give the amine-quinone polyimide (AQPI-2). AQPI-2 had a thermal decomposition temperature (10% weight loss) of 540°C and a glass transition near 290°C, values typical of polyimides. The degradation of the coating on iron after exposure to NaCl electrolyte was followed by electrochemical impedance spectroscopy. Under these conditions a conventional polyimide failed after 3 days exposure, while AQPI-2 showed no change after 34 days exposure. The adhesive bond between the amine-quinone polyimide and the iron surface was so strong that it could not be broken by the electrolyte.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 629: Symposium FF – Interfaces, Adhesion and Processing in Polymer Systems , 2000 , FF5.17
Copyright
Copyright © Materials Research Society 2000

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References

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