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Ion Exchange Reaction in a Thin Film of Polyimide

Published online by Cambridge University Press:  21 February 2011

Yoshiro Akagi
Affiliation:
SHARP Corporation, Materials Research & Analysis Division, Corporate R&D group, Tenri, Nara 632, JAPAN
Mariko Ishino
Affiliation:
SHARP Corporation, Materials Research & Analysis Division, Corporate R&D group, Tenri, Nara 632, JAPAN
Yasunari Okamoto
Affiliation:
SHARP Corporation, Materials Research & Analysis Division, Corporate R&D group, Tenri, Nara 632, JAPAN
Hiroshi Taniguchi
Affiliation:
SHARP Corporation, Materials Research & Analysis Division, Corporate R&D group, Tenri, Nara 632, JAPAN
Kohji Ohoka
Affiliation:
SHARP Corporation, Materials Research & Analysis Division, Corporate R&D group, Tenri, Nara 632, JAPAN
Yoshiharu Nakajima
Affiliation:
SHARP Corporation, Materials Research & Analysis Division, Corporate R&D group, Tenri, Nara 632, JAPAN
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Abstract

Relationship between the degree of imide-ring-condensation and the absorbed quantity of sodium ion was studied in a polyimide film of 100nm thick immersed in an alcoholic solvent containing sodium ion in order to elucidate a mechanism of incorporation of ionic species. Absorption and depth-profile of sodium ion in a film were quantitatively determined by chemical analysis and secondary ion mass spectroscopy. Concentration of sodium ion in a thin film by two orders of magnitude was observed, and distribution of sodium ion in a thin film was found to be uniform, which cannot be accounted for by any kinds of previous models based on diffusion, permeation, or solvation. Instead, chemical ion-exchange model is proposed and is found to satisfactorily explain the experimental results.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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References

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