Rare earth metal-containing polymers

Fluorescence spectroscopy has also been widely used for investigating microviscosity in carbohydrates,deformation of poly(vinyl alcohol),composition of rare-earth metal-containing polymers,crystallinity in polyolefins and... 

RARE EARTH METAL CONTAINING POLYMERS ENERGY TRANSFER FROM URANYL TO EUROPIUM IONS IN lONOMERS... 

Okamoto, Y., Ueba, Y., Dzhnibekov, N. F., Banks, E. Rare earth metal containing polymers. 3. Characterization of ion-containing polymer structures using rare earth metal fluorescence probes. Macromolecules, 14,17-22 (1981). 

Feng and coworkers [29] reported on the synthesis and fluorescence properties of ternary complexes of polymer-bound organometal moieties including tripheny-lantimony. These complexes also contain the rare earth metal ions Eu, Sm, and Tb and thenoyltiifluoroacetone. The general structure is given below (18) where R = phenyl. 

This volume of the Handbook on the Physics and Chemistry of Rare Earths adds five new chapters to the science of rare earths, compiled by researchers renowned in their respective fields. Volume 34 opens with an overview of ternary intermetallic systems containing rare earths, transition metals and indium (Chapter 218) followed by an assessment of up-to-date understanding of the interplay between order, magnetism and superconductivity of intermetallic compounds formed by rare earth and actinide metals (Chapter 219). Switching from metals to complex compounds of rare earths, Chapter 220 is dedicated to molecular stmctural studies using circularly polarized luminescence spectroscopy of lanthanide systems, while Chapter 221 examines rare-earth metal-organic frameworks, also known as coordination polymers, which are expected to have many practical applications in the future. A review discussing remarkable catalytic activity of rare earths in site-selective hydrolysis of deoxyribonucleic acid (DNA) and ribonucleic acid, or RNA (Chapter 222) completes this book. 

By using rare earth metals or radicals it is possible to copolymerize 1,3-butadiene and other dienes with cis-, A linkage [3,498]. Polymers of 1,3-butadiene and isoprene at any ratio can be obtained. Copolymes of 1,3-butadiene and 1,3-pentadiene can be produced with catalysts on the basis of vanadium chelates. 1,3-Butadiene is almost completely converted to trans-, A units, whereas 1,3-pentadiene yields 50 to 60% 1,4-addition and 40 to 50% 1,2-addition products. At a 1,3-pentadiene content of 26 to 45wt%, the copolymers are amorphous, featuring high rigidity [499-501]. Diethylaluminum chloride, nickel naphthenate, and water catalyze the copolymerization of 1,3-butadiene and acetylene. The low-molecular-weight copolymers contain mostly cis-Q-Q double bonds [502]. 

BERNSON A and LINDGREN J, lon aggregation and morphology for poly (ethylene oxide)-based polymer electrolytes containing rare earth metal salts , Solid State Ionics, 1993,60, 31-36... 

A. Kajiwara, K. Aramata, M. Kamachi, and K. Sumi, Radical polymerization of 5-(4-vinylphenyl)-10,15,20-triphenyl porphyrins, Polym. J., 26, 215 (1994). M. Kamachi, X. S. Cheng, and S. Nozakura, Synthesis and properties of polymers containing rare earth metal ions in their side chains. Fifth Rare Earth Symposium, Tokyo, 1987, preprint 2B05. 

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