Abstract
An in situ steady-state fluorescence (SSF) technique was applied in order to study the dissolution process of polystyrene (PS) latex films. The effect of the molecular weight M w of the PS on the dissolution rate was investigated. The PS chains were copolymerized with (1-pyrene)methyl methacrylate in order to make use of pyrene (P) as a fluorescent probe to monitor the dissolution process. Seven different films were prepared from P-labeled PS latex dispersions with different molecular weights at room temperature. These films were then annealed at 200 °C for 15 min to complete the film formation process before dissolution. The dissolution of PS films in a toluene (70 %)–cyclohexane (30 %) mixture was monitored in real time by watching the change in the fluorescence intensity of P, I P. We used a model that included both case I and case II diffusion kinetics to interpret the results of the dissolution experiments. The relaxation constants k 0 and the dissolution coefficients D d of the polymer chains were measured. Two different dissolution coefficients were obtained, which were attributed to the small and long polymer chains in the film, considering the high polydispersity of the polymer. It was also found that both of the D d values scaled with M w according to the law D d ≈ M −n.
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Acknowledgments
We would like to thank Dr. Abdelhamid Elaissari for supplying us with the latex materials.
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Ugur, S., Dinc, A.K. & Kislak, Y. Effect of molecular weight on the dissolution properties of polystyrene latex films. J Polym Res 19, 9943 (2012). https://doi.org/10.1007/s10965-012-9943-0
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DOI: https://doi.org/10.1007/s10965-012-9943-0