Premium
Dye Diffusion in Polymer Films Subjected to Supercritical CO 2 : Confocal Raman Microscopy and Modelling
Author(s) -
Fleming Oliver S.,
Stepanek Frantisek,
Kazarian Sergei G.
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200500075
Subject(s) - raman spectroscopy , supercritical fluid , analytical chemistry (journal) , microscopy , confocal , raman microscope , optical microscope , materials science , diffusion , polymer , fick's laws of diffusion , raman microspectroscopy , confocal microscopy , chemistry , raman scattering , optics , scanning electron microscope , chromatography , composite material , thermodynamics , organic chemistry , physics
Summary: Poly(ethylene terephthalate) films impregnated with Disperse Red 1 from a supercritical CO 2 solution were studied using confocal Raman microscopy. Depth profiles of films dyed for different periods of time were measured using the oil immersion approach and concentration‐depth plots of the relative dye concentration were generated. A one‐dimensional Fickian diffusion model was used to evaluate the diffusion coefficient of the dye from the Raman microscopy data using a non‐linear least squares regression. The calculated diffusion coefficient at 200 bar and 80 °C was 6.75 ± 1.01 × 10 −14 m 2 · s −1 .Typical example of Raman spectra acquired during depth profiling.