Dye Diffusion in Polymer Films Subjected to Supercritical CO2: Confocal Raman Microscopy and Modelling

✍ Scribed by Oliver S. Fleming; Frantisek Stepanek; Sergei G. Kazarian

• Book ID: 102486030
• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 132 KB
• Volume: 206
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200500075

✦ Synopsis

Abstract

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.

imageTypical example of Raman spectra acquired during depth profiling.