Mm. Chehimi et al., AN INVERSE GAS-CHROMATOGRAPHIC STUDY OF THE PMMA CONDUCTING POLYPYRROLE INTERFACE/, Journal of adhesion science and technology, 10(4), 1996, pp. 287-303
The poly(methyl methacrylate)/chloride-doped polypyrrole (PMMA/PPyCl)
interface in PMMA-coated PPyCl powders has been characterized by inver
se gas chromatography (IGC). The study is based on the determination o
f the surface energy of the various materials tested. It is shown that
gamma(S)(d), the dispersive contribution to the surface energy of PPy
Cl, decreases following adsorption of PMMA onto PPyCl, a high surface
energy material. The overall acid-base character of the coated powders
shifts from a predominant acidity to a predominant basicity following
PMMA adsorption. However, the nature of the casting solvent strongly
influences the morphology of the PMMA coatings, as judged from their s
urface thermodynamic properties. Indeed, for approximately the same re
lative surface proportion of PMMA, both dispersive and acid-base prope
rties of the coated PPyCl differ, depending on whether PMMA is cast fr
om a good or a poor solvent. The results obtained suggest that from po
or solvents, PMMA adsorbs onto PPyCl and leads to homogeneous coatings
(provided that the amount of adsorbed PMMA is large enough to reach a
t least a monolayer), whereas from good solvents, the adsorption of PM
MA results in inhomogeneous coatings.