Regioselective, stereoselective, and living polymerization of divinyl pyridine monomers using rare earth catalysts

2020 ◽  
Vol 11 (12) ◽  
pp. 2044-2052 ◽  
Author(s):  
Chao Yan ◽  
Zhao-Xuan Liu ◽  
Tie-Qi Xu
Keyword(s):  
Rare Earth ◽  
Living Polymerization

The first regioselective, stereoselective, and living polymerization of divinyl pyridine monomers, mediated by simple rare earth catalysts, is reported.

Novel Rare Earth Catalysts for the Living Polymerization and Block Copolymerization of ε-Caprolactone

1996 ◽  
Vol 29 (26) ◽  
pp. 8289-8295 ◽  
Author(s):  
Youqing Shen ◽  
Zhiquan Shen ◽  
Yifeng Zhang ◽  
Kemin Yao
Keyword(s):  
Rare Earth ◽  
Living Polymerization ◽  
Block Copolymerization

NNN-Tridentate Pyrrolyl Rare-Earth Metal Complexes: Structure and Catalysis on Specific Selective Living Polymerization of Isoprene

2012 ◽  
Vol 31 (17) ◽  
pp. 6014-6021 ◽  
Author(s):  
Lingfang Wang ◽  
Dongtao Liu ◽  
Dongmei Cui
Keyword(s):  
Rare Earth ◽  
Metal Complexes ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Living Polymerization ◽  
Rare Earth Metal Complexes

Rare-Earth Metal Bis(alkyl)s Supported by a Quinolinyl Anilido-Imine Ligand: Synthesis and Catalysis on Living Polymerization of ε-Caprolactone

2008 ◽  
Vol 27 (22) ◽  
pp. 5889-5893 ◽  
Author(s):  
Wei Gao ◽  
Dongmei Cui ◽  
Xiaoming Liu ◽  
Yu Zhang ◽  
Ying Mu
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Living Polymerization ◽  
Ligand Synthesis

Highly Cis-1,4-Selective Living Polymerization of 1,3-Conjugated Dienes and Copolymerization with ε-Caprolactone by Bis(phosphino)carbazolide Rare-Earth-Metal Complexes

2011 ◽  
Vol 30 (4) ◽  
pp. 760-767 ◽  
Author(s):  
Lingfang Wang ◽  
Dongmei Cui ◽  
Zhaomin Hou ◽  
Wei Li ◽  
Yang Li
Keyword(s):  
Rare Earth ◽  
Metal Complexes ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Living Polymerization ◽  
Conjugated Dienes ◽  
Rare Earth Metal Complexes

Highly 3,4-selective living polymerization of 2-phenyl-1,3-butadiene with amidino N-heterocyclic carbene ligated rare-earth metal bis(alkyl) complexes

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 93507-93512 ◽  
Author(s):  
Changguang Yao ◽  
Hongyan Xie ◽  
Dongmei Cui
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Living Polymerization ◽  
Alkyl Complexes

2-Phenyl-1,3-butadiene was polymerized using an amidino N-heterocyclic carbene lutetium bis(alkyl) precursor in high 3,4-selectivity (96.9%) and a living mode to afford a new plastic polydiene with a high Tg of 56.1 °C.

Highly 3,4-Selective Living Polymerization of Isoprene with Rare Earth Metal Fluorenyl N-Heterocyclic Carbene Precursors

2008 ◽  
Vol 41 (6) ◽  
pp. 1983-1988 ◽  
Author(s):  
Baoli Wang ◽  
Dongmei Cui ◽  
Kui Lv
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Living Polymerization

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

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