Abstract
We report the effect of an iodine filler on photoisomerization kinetics of photo-switchable PEO-BDK-MR thin films. The kinetics of photoisomerization and time progression of PEO-BDK-MR/I2 nanocomposite thin films are investigated using UV-Vis, FTIR spectroscopies, and modified mathematical models developed using new analytical methods. Incorporating iodine filler into the PEO-BDK-MR polymeric matrix enhances the isomerization energy barrier and considerably increases the processing time. Our outcomes propose that enhanced photoisomerized and time processed (PEO-BDK-MR)/I2 thin films could be potential candidates for a variety of applications involving molecular solar thermal energy storage media.
Highlights
The kinetics of the photoisomerization process of the Polyethylene Oxide (PEO)-Benzyl Dimethyl Ketal (BDK)-MR polymer composite thin film is investigated by exploring the transformation from the initial trans-phase to cis-phase via UV-illumination
We examine the influence of iodine filler on the photoisomerization kinetics of photoswitchable thin films based on PEO-BDK-MR
The kinetics of photoisomerization and time evolution of the hybrid thin film was examined via the UV-Vis and the Fourier transform infrared spectroscopy (FTIR) spectroscopic techniques and by using specific analytical models
Summary
Hecht et al [16] recently reported that 2,2,6,6-tetrafluoroazobenzene shows near quantitative photoswitching and the longest thermal half-life reported for an azobenzene molecule (∼700 days at 25 ◦ C in DMSO). The iodine dopant ions in any polymer may be present at many sites, such as exchange into the polymer chains, or reside at the amorphous/crystalline boundaries, forming charge transfer compounds. It may form ions aggregates between the polymer chains [22], which may increase the lifetime, activation energy and, increase thermal storage energy according to increasing photochemical potential
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