The film of silver alginate was photolyzed when irradiated at wavelenght 253.7 nm. With irradiation the surface of the film finally turned into a metallic mirror due to the photolytic silver. The primary photochemical process is associated with one electron transfer from the carboxylate ion to the adjacent silverion. A reaction mechanism has been suggested for this photolysis.
The photosensitive ionomer is a polymer ionically crosslinked with a metallic ion of variable valence on exposure. By using the ionomer crosslinked with mercurous ions, the authors have already reported the formation of visible, relief, and electrically conductive images and the amplification of a latent image by reducing and oxidizing developments. In the next series of studies it was planned that mercurous ion may be replaced by cuprous or cupric ion, and photosensitivity of various copper (I and II) carboxylates was investigated as the first step. Cupric salts of dibasic carboxylic acids and cuprous carboxylates were found to be comparatively sensitive among them.
Chemical analysis was carried out on the products of UV-irradiated poly (vinyl p-azidobenzoate) (PVAB) film followed by hydrolysis. The products obtained were p-aminobenzoic acid, 4, 4'-azobisbenzoic acid, 4, 4'-azobisbenzoic acid NV oxide, poly (vinyl alcohol) (PVA) and PVA containing -NH-C6H4-COOH (para). From these results, we estimated the photochemical reaction of PVAB film as follows:(1) the main reaction of the azido group was hydrogen abstraction, (2) the recombination of polymer radicals formed by hydrogen abstraction and the insertion reaction by nitrenes were mainly responsible for the crosslinking of PVAB, and (3) the azo bond formation did not proceed in high yield, compared with the hydrogen abstraction.
The laser spectrum, absorption and fluorescence spectra of a cyanine dye 3, 3'-diethyl-2, 2'-oxatricarbocyanine iodide were observed. On the other hand, the energy levels and oscillator strengths of the singlet state and the triplet state were calculated by applying the LCAO-SCF-CI method. And from both observed and calculated results, the relations between them were discussed. The energy level difference between the singlet ground state SO and the excited state S1 was calculated to be 16652 cm-1. The peak absorption spectrum was estimated at about 16556 cm-1 in an ethanol solution based on the experimental value with additional consideration of the solvent effect. And a fairly good agreement was obtained between the calculated and experimental values. The oscillator strength was 2.427 for the SO-S1 transition which was found dominant. Hence, the good pumping efficiency was considered this dye. The difference in energy level between the excited state S1 and the triplet state T1 was 12514 cm-1. This large difference suggests a small interaction between singlet and triplet states, and further could be estimated a high efficiency in laser oscillation.
The behaviors of silicone resins exposed to electron beam at 30 KV have been studied. The charge density to harden the methyl silicone is found to be 6 × 10-7 Coulomb/cm2. Silicone resins with methyl and phenyl groups were synthesized so that the substitutional effect of hardening the resists by electron beam was investigated. It is found that methyl silicone is more sensitive to the electron beam than phenyl silicone and that the sensitivity increase almost linearly with increasing methyl group in the silicone polymer.
The electrophoretic mobilities of gelain were measured by the moving boundary method. The approximate charge-mobility ratio, 10.6 (per g. of gelatin), was estimated from the mobilities and the pH titration data. By converting the mobility change of gelatin produced by added lead ion into charge unit, the amount of lead ions bound to gelatin was calculated. The association constant between lead ion and the carboxyl site of gelatin (log km=2.4) is calculated, which is a little larger than the values obtained by other methods.
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