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Determination of poisson's ratio for polyimide films
Author(s) -
Bauer C. L.,
Farris R. J.
Publication year - 1989
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760291606
Subject(s) - polyimide , materials science , poisson's ratio , dilatometer , poisson distribution , composite material , hydrostatic pressure , analytical chemistry (journal) , thermodynamics , chromatography , chemistry , mathematics , statistics , physics , layer (electronics) , thermal expansion
The Poisson's ratios of polyamic acid and polyimide films were determined using a high pressure gas dilatometer. In this technique, a sample is held at constant length and a hydrostatic pressure is applied to the sample. The resulting change in stress on the sample with applied pressure provides a measure of Poisson's ratio. For fully cured polyimide films based on pyromellitic dianhydride and oxydianiline, Poisson's ratio was measured to be 0.34 at approximately 1% strain. This value increases to 0.48 as the strain is increased to 5%.