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Supercritical fluid dyeing of PMMA films with azo‐dyes
Author(s) -
West Barry L.,
Kazarian Sergei G.,
Vincent Michael F.,
Brantley Noel H.,
Eckert Charles A.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980801)69:5<911::aid-app10>3.0.co;2-r
Subject(s) - dyeing , supercritical fluid , methyl methacrylate , diffusion , materials science , polymer , solubility , polymer chemistry , chemical engineering , phase (matter) , polystyrene , ultraviolet , chemistry , composite material , organic chemistry , copolymer , thermodynamics , physics , optoelectronics , engineering
In situ ultraviolet–visible spectroscopy has been used to study diffusion of two azo‐dyes in a CO 2 ‐swollen matrix of poly(methyl methacrylate) (PMMA). The diffusivity of both dyes can be tuned simply be changing the system pressure. Higher pressure of CO 2 enhances diffusion of a dye in PMMA. The diffusion of dyes in CO 2 ‐swollen PMMA can also be influenced by specific interactions. The partitioning of the dyes between the polymer phase and the fluid phase was measured, and the partition coefficients are large (10 4 –10 5 ). Thus, supercritical fluid dyeing is possible, although the solubility of the dyes in the fluid phase is low. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 911–919, 1998