Real time monitoring of latex film dissolution by UVV technique
✍ Scribed by Önder Pekcan; Ertan Arda
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 182 KB
- Volume
- 75
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
UV-visible (UVV) technique is used for monitoring of polymer film dissolution. These films are formed from pyrene (P)-labeled poly(methyl methacrylate) (PMMA) latex particles, sterically stabilized by poly isobutylene (PIB, Annealing of films was performed above T g at various temperatures for 30-min time intervals. Diffusion of solvent molecules (chloroform) into the annealed latex film was followed by desorption of PMMA chains. Desorption of P-labeled PMMA chains was monitored in real time by the absorbance change of P in the polymer-solvent mixture. A diffusion model with a moving boundary was used to quantify real time UVV data. Diffusion coefficients of desorbed PMMA chains were measured and found to be between 2 and 0.6 ϫ 10 Ϫ11 cm 2 s Ϫ1 in the 100 and 275°C temperature range.