Temperature dependence of the drying process in polymer solutions observed by dynamic speckle detection

E. Stoykova; B. Blagoeva; L. Nedelchev; D. Nazarova

doi:10.1117/12.2527432

3 October 2019 Temperature dependence of the drying process in polymer solutions observed by dynamic speckle detection

E. Stoykova, B. Blagoeva, L. Nedelchev, D. Nazarova

Proceedings Volume 11207, Fourth International Conference on Applications of Optics and Photonics; 112071S (2019) https://doi.org/10.1117/12.2527432
Event: IV International Conference on Applications of Optics and Photonics (AOP 2019), 2019, Lisbon, Portugal

Abstract

Dynamic speckle metrology is a means for evaluating the speed of various processes in industrial or biological samples. The method indicates regions of lower or higher activity on the sample surface through statistical processing of speckle patterns formed on this surface under laser illumination. In this paper, we applied the method to study the influence of the substrate temperature on the drying process in azopolymer solutions leading to formation of thin photo birefringent polymer films. This would give the optimal temperature for obtaining smooth and uniform thin films for the shortest possible time. We recorded several sets of correlated in time speckle patterns of a transparent drop of azopolymer solution in two different solvents (water and methanol) on a glass plate illuminated by laser light. The temperature of the plate and respectively of the polymer solution was controlled by high-precision thermal stage. We built two-dimensional maps of activity at different moments and estimated the speed of drying of the polymer solution depending of the substrate temperature. This data were further correlated with the optical quality of the dry polymer thin films.

Citation Download Citation

E. Stoykova, B. Blagoeva, L. Nedelchev, and D. Nazarova "Temperature dependence of the drying process in polymer solutions observed by dynamic speckle detection", Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 112071S (3 October 2019); https://doi.org/10.1117/12.2527432

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