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Laser induced holographic grating relaxation studies of thymorquinone (TQ) dissolved in
amorphous poly(-methyl styrene) (PaS) and comphorquinme (CK) in poly(methyl methacrylate)
(PMMA) have been carried out. Different types of lineshape associated with the relaxation of
the diffraction intensity are observed and are interpreted in terms of various diffusion processes.
Diffusion coefficients are obtained as a function of TO concentration from 0.3 to 20 weight
percent in PcS and from 0.5 to 15 weight percent for CQ is PMMA. Above 0.5% the diffusion
coefficient increases rapidly with increasing dye concentration. The temperature dependence
of the self-diffusion coefficient follows the Williams-Landel-Ferry equation, whereas the mutual
diffusion coefficient at higher dye concentration is Arrhenius. In addition, the self-diffusion
coefficient of the dye molecule in polymer decreases very rapidly as the sample temperature is
traversed across Tg. However, there is no detectable effect due to the onset of the glass
transition on the mutual diffusion coefficient at finite dye concentration. The difference is
interpreted as due to the plasticizing effect of the dye molecules. Free volume theory is used
to interpret the concentration dependence of the diffusion coefficient.
C. H. Wang
"Diffusion of dye molecules in the dye/polymer systems by the holographic-grating-relaxation technique", Proc. SPIE 1213, Photopolymer Device Physics, Chemistry, and Applications, (1 April 1990); https://doi.org/10.1117/12.18023
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C. H. Wang, "Diffusion of dye molecules in the dye/polymer systems by the holographic-grating-relaxation technique," Proc. SPIE 1213, Photopolymer Device Physics, Chemistry, and Applications, (1 April 1990); https://doi.org/10.1117/12.18023