Direct measurements of Cu diffusion into a polyimide below the glass transition temperature

Diffusion of a metal (Cu) into a fully cured polymer (polyimide) below the glass transition has been systematically investigated for the first time by means of low-energy ion sputtering in combination with a radiotracer technique. The penetration profiles exhibit a steep non-Fickian decay of the tra...

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Bibliographic Details
Published in:Applied physics letters 1989-07, Vol.55 (4), p.357-359
Main Authors: FAUPEL, F, GUPTA, D, SILVERMAN, B. D, HO, P. S
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Permeability
Physical properties
Polymer industry, paints, wood
Properties and testing
Technology of polymers
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Summary:Diffusion of a metal (Cu) into a fully cured polymer (polyimide) below the glass transition has been systematically investigated for the first time by means of low-energy ion sputtering in combination with a radiotracer technique. The penetration profiles exhibit a steep non-Fickian decay of the tracer concentration over several orders of magnitude followed by a relatively flat Fickian tail. The initial decay is attributed to the formation of Cu clusters and is discussed in terms of a Monte Carlo simulation. The Fickian tail is related to the diffusion of single Cu atoms. Diffusion measured at the lowest temperature deviates from linearity on the Arrhenius plot and seems to be controlled by a free-volume mechanism of diffusion below the glass transition temperature.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.101907