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Synthesis and characterization of rare earth metal‐containing polymers. I. Fluorescent properties of ionomers containing Dy 3+ , Er 3+ , Eu 3+ , and Sm 3+
Author(s) -
Banks E.,
Okamoto Y.,
Ueba Y.
Publication year - 1980
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1980.070250303
Subject(s) - copolymer , polymer , methacrylic acid , acrylic acid , styrene , ionomer , materials science , methacrylate , fluorescence , polymer chemistry , quenching (fluorescence) , methyl methacrylate , ionic bonding , chemistry , ion , organic chemistry , physics , quantum mechanics , composite material
Abstract Rare earth metal (Dy 3+ , Er 3+ , Eu 3+ , and Sm 3+ ) salts of copolymers of methyl methacrylate–methacrylic acid, styrene–acrylic acid, 1‐vinylnaphthalene–acrylic acid and 1‐vinylanthracene–styrene–acrylic acid were prepared. The fluorescence of these polymer salts under ultraviolet excitation was investigated. The fluorescent intensity of polymer–Eu 3+ films varied with film thickness because of incomplete absorption of exciting light, hence most of the measurements were made on pressed fine powders. The fluorescent intensity of mixed samples of Eu(III) acetate in a polymer matrix increased linearly with Eu content. However, the Eu 3+ –polymer complex system displayed typical concentration‐quenching behavior, reaching a maximum at 4–5 wt % Eu and decreasing with further increases in Eu content. This suggests that the ionomer contains ionic aggregates, in agreement with a recently proposed model. Such aggregates would create locally high Eu ion concentrations, whose interactions lead to concentration quenching at low nominal concentrations. The fluorescent intensity of the acrylic copolymers decrassed in the order methacrylate > styrene > naphthalene > anthracene. This sequence is explained by incrasing competition for the exciting light by the aromatic groups with negligible energy transfer from the aromatic groups to the Eu 3+ ions. This is also consistent with the hypothesis that the ionic regions of the polymer are segregated.