96556-05-7Relevant articles and documents
Well-defined iron complexes as efficient catalysts for green atom-transfer radical polymerization of styrene, methyl methacrylate, and butyl acrylate with low catalyst loadings and catalyst recycling
Nakanishi, So-Ichiro,Kawamura, Mitsunobu,Kai, Hidetomo,Jin, Ren-Hua,Sunada, Yusuke,Nagashima, Hideo
, p. 5802 - 5814 (2014)
Environmentally friendly iron(II) catalysts for atom-transfer radical polymerization (ATRP) were synthesized by careful selection of the nitrogen substituents of N,N,N-trialkylated-1,4,9-triazacyclononane (R3TACN) ligands. Two types of structures were confirmed by crystallography: [(R3TACN)FeX2] complexes with relatively small R groups have ionic and dinuclear structures including a [(R 3TACN)Fe(μ-X)3Fe(R3TACN)]+ moiety, whereas those with more bulky R groups are neutral and mononuclear. The twelve [(R3TACN)FeX2]n complexes that were synthesized were subjected to bulk ATRP of styrene, methyl methacrylate (MMA), and butyl acrylate (BA). Among the iron complexes examined, [{(cyclopentyl) 3TACN}FeBr2] (4b) was the best catalyst for the well-controlled ATRP of all three monomers. This species allowed easy catalyst separation and recycling, a lowering of the catalyst concentration needed for the reaction, and the absence of additional reducing reagents. The lowest catalyst loading was accomplished in the ATRP of MMA with 4b (59ppm of Fe based on the charged monomer). Catalyst recycling in ATRP with low catalyst loadings was also successful. The ATRP of styrene with 4b (117ppm Fe atom) was followed by precipitation from methanol to give polystyrene that contained residual iron below the calculated detection limit (0.28ppm). Mechanisms that involve equilibria between the multinuclear and mononuclear species were also examined. It's easy being green: Structurally well-defined [(R3TACN)FeX 2] complexes realized green atom-transfer radical polymerization by judicious choice of the R group on the N,N,N-trialkylated-1,4,9- triazacyclononane (R3TACN) ligands (see scheme). [{(Cyclopentyl) 3TACN}FeBr2] was the best catalyst for controlled polymerization of all three monomers.
A paper pulp, fabric bleaching catalyst preparation method of the ligand
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Paragraph 0019, (2017/03/17)
The invention discloses a preparation method of a catalyst ligand for bleaching paper pulp and textile in low temperature. The preparation method comprises following main steps: dissolving diethylenetriamine containing sulfonyl groups in an organic solvent, adding an alkaline reagent and ethylene glycol diacetate, subjecting the mixture to reactions for 6 to 20 hours at the temperature of 80 to 150 DEG C, cooling to the room temperature after the reactions finish, and then filtering to obtain 1,4,7-trisulfonyl-1,4,7-triazacyclononane; adding 1,4,7-trisulfonyl-1,4,7-triazacyclononane in sulfuric acid, stirring for 2 to 12 hours at the temperature of 80 to 130 DEG C, adding in alkali to neutralize after cooling, adding formaldehyde and formic acid, and performing reflux to obtain 1,4,7-trimethyl-1,4,7-triazacyclononane. The preparation method is simple, has the advantages of available materials, and less waste gas, waste water and waste residues, is suitable for industrial production and meets the environmental protection requirements of industry production.
Method of producing polymer using iron complex as catalyst
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Page/Page column 17, (2010/04/23)
The object of the present invention is to provide a method of producing a polymer wherein radical-polymerizable monomers can be polymerized in a quantitative manner in a relatively short time, and a polymer or a block copolymer having at its termini a functional group that can be chemically converted while the polymer or the block copolymer has a high molecular weight can be produced. Furthermore, the object of the present invention is to provide a method of producing a polymer wherein the polymer is re-precipitated in a general solvent by an easy method, and the used iron complexes are recovered in the solvent, thereby recycling the iron complexes.