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- Title
ДОСЛІДЖЕННЯ УТВОРЕННЯ TІ<sup>3+</sup>-ЦЕНТРІВ ПІД ДІЄЮ УФ-ВИПРОМІНЮВАННЯ ТІ-ВМІСНИХ ВЗАЄМОПРОНИКНИХ ПОЛІМЕРНИХ СІТОК МЕТОДОМ ЕПР
- Authors
АЛЕКСЄЄВА, Т. Т.; КОЗАК, Н. В.; ЯРОВА, Н. В.
- Abstract
Ti-containing interpenetrating polymer networks (Ti-IPNs) based on the cross-linked polyurethane, poly (hydroxyethyl methacrylate) and poly (titanium oxide) have been synthesized. First poly (titanium oxide) was synthesized by sol-gel method in the presence of 2-hydroxyethyl methacrylate at different molar ratio of Ti(OPri)4/H2O. The results of optical spectrophotometry show that the light transmission coefficients (T, %) of titanium-containing interpenetrating polymer networks were of 90,7-91,0% at λ=650 nm. According to EPR data, UV irradiation in the air at room temperature of Ti-IPN samples is accompanied by appearance of signal of paramagnetic centers with broad isotropic signal at g1= 2,010 and also noticeably splitted signals at g2 = 2,003 and g3 =1,967. First and second of them can be ascribed to the oxygen-containing "hole scavenger", while the third one is associated with the Ti3+ paramagnetic ions. The low rate of the electron-hole pair recombination at room temperature in the air demonstrates efficient separation of the charged particles in the hybrid material. Using nitroxyl spin probe (SP) it was revealed that UV-induced charge separation and subsequent charge recombination in Ti-IPNs is accompanied by compaction of macro chains in the hybrid system analysed. The observed changes in the permeability of the Ti-IPN for nitroxyl SP correlate with the measurements of the specific density and the results of the DSC for determining the heat capacity increment (ΔC).
- Subjects
POLYMER networks; TITANIUM oxides; ELECTRON-hole recombination; LIGHT transmission; HEAT capacity; NITROXYL; CROSSLINKED polymers
- Publication
Polymer Journal / Polymernyi Zhurnal (18181724), 2020, Vol 42, Issue 3, p218
- ISSN
1818-1724
- Publication type
Article
- DOI
10.15407/polymerj.42.03.218