Detail of "852-38-0"

Reference

Photostabilization of coatings

Photostabilization of coatings. Studies on resonance energy transfer. Breskman, Ellis L.; Pappas, S. Peter (Dep. Polym. Coatings, North Dakota State Univ., Fargo, N. Dak.Several reagents with their cas registry numbers 7235-40-7 and 13927-77-0 are used here., USA). J. Coat Technol., 48(622), 34-44 (English) 1976. CODEN: JCTEDL. DOCUMENT TYPE: Journal CA Section: 42 (Coatings, Inks, and Related Products) Section cross-reference(s): 74 Fluorescence studies of Eponol 55 B 40 [25068-38-6] and ethylene glycol-2,4-tolylene diisocyanate copolymer [24969-33-3] urethane coatings showed that hydroxybenzophenone stabilizers function by a combination of light screening and quenching by resonance energy transfer (RET). The decrease in effectiveness of stabilization with time, as measured by accelerated yellowing, was due to rapid formation of a photoproduct which competes as an RET quencher with the hydroxybenzophenones, but is less capable of harmlessly dissipating the energy transfered to it. Attempts to stabilize the photoproduct from the epoxy coating were unsuccessful. The antioxidants tested were: NBC [13927-77-0], Antioxidant 2246 [119-47-1], zinc dimethyldithiocarbamate [137-30-4], Cyasorb UV 1084 [14516-71-3], AM 101 [27574-34-1], and trans-.beta.-carotene [7235-40-7]; the UV light stabilizers were: triphenylamine [603-34-9], PBD [852-38-0], and 2,4-dihydroxybenzophenone [131-56-6] for the epoxy coating and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone [131-54-4] and 2,2',4,4'-tetrahydroxybenzophenone [131-55-5] for the urethane coatings. .

Excitation transfer of organic molecules in condensed phases

Excitation transfer of organic molecules in condensed phases. I. Energy transfer in multicomponent mixture or organic dyes embedded in a polystyrene matrix. Niu, Erping; Zhang, Xingkang; Guo, Chu (Inst. Chem., Acad. Sinica, Beijing, Peop. Rep. China). Huaxue Xuebao, 42(12), 1271-5 (Chinese) 1984. CODEN: HHHPA4. ISSN: 0567-7351. DOCUMENT TYPE: Journal CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 37 The steady-state absorption and emission spectra, relative emission intensity, fluorescence life time, and time-resolved emission spectra were detd. for 2-phenyl-5-(4-biphenyl)-1,3,4-oxadiazole (I) [852-38-0], p-bis[2-(5-phenyloxazolyl)]benzene (II) [5888-97-1], Fluorescent green (III) [54990-70-4], and Rhodamine B (IV) [81-88-9] mixed in polystyrene (V) [9003-53-6] matrix, and the results indicated the existence of a cascade excitation transfer among these dyes, i.e. I to II to III to IV. The mechanism of the energy transfer among these dyes and factors affecting the emission efficiency of the mixed dye-V system were discussed.