The static scattering properties and phase behavior of mixtures of
homopolymers and diblock
copolymers are considered. The effects of architecture on these
properties are investigated. In particular,
the results obtained for mixtures with cyclic homopolymers and
copolymers are compared with those
obtained in the case of mixtures of linear chains. Depending on
the concentration of copolymer, one may
observe an interplay between macrophase and microphase separation
transitions. This interplay is
investigated for cyclic and linear chain systems. Mixtures made of
cyclic copolymers show enhancement
of compatibility towards phase separation. Phase diagrams are
plotted to show the compatibilization.
Effects of topological constraints on chain architecture and
interactions are ignored for cyclic chain systems.
Cerium (Ce 3? )-doped monoclinic X 1 -Y 2 SiO 5 (YSO)-type oxyorthosilicates powders were prepared by monomer and polymer-assisted sol-gel method. The present work aims to study the influence of ethylene glycol (EG) monomer, polyethylene glycol (PEG) polymer and polyvinyl alcohol (PVA) polymer, as fuels and nucleating agents for the crystallization, on structural and luminescence properties of the Ce 3? (xCe = 0.01)-doped Y 2 SiO 5 . The X-ray diffraction technique, field emission scanning electron microscopy, Fourier transform infrared spectroscopy and steady photoluminescence have been used to characterize the samples. It is found that the types of fuels affect the phase purity and luminescent characteristics of phosphors. All samples exhibit intense violet-blue asymmetric emission band in the range of 370-540 nm with a maximum intensity centered at around 420 nm assigned to the 5d ? 4f (2F5/2, 2F7/2) interconfigurational transitions of Ce 3? ion in YSO nanomaterial. Finally, the vibronic coupling parameters are estimated and discussed.
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