Abstract Due to the shortage of high-quality natural sand, development polycarboxylic acid water reducer with excellent clay resistance has become a research hotspot in recent years. Using acrylic acid, methyl 4-vinylbenzoate, ethylene glycol monovinyl polyethylene ether molecular weight 3000 (EPEG-3000) as comonomers, under action sodium bisulfite formaldehyde-hydrogen peroxide redox initiator...

Electrochemically mediated atom transfer radical polymerization (eATRP) of styrene was studied in detail by using CuBr2/TPMA (TPMA = tris(2-pyridylmethyl)amine) as a catalyst. Redox properties various Cu(II) species were investigated CH3CN, dimethylformamide (DMF), and dimethyl sulfoxide (DMSO) both the absence presence 50% (v/v) styrene. This investigation together with preliminary eATRP exper...

The Mn(III)-initiated aerobic oxidation of heterocyclic 1,3-dicarbonyl compounds, such as 4-alkyl-1,2-diphenylpyrazolidine-3,5-diones, 1,3-dialkylpyrrolidine-2,4-diones, 3-alkyl-1,5-dimethylbarbituric acids, and 3-butyl-4-hydroxy-2-quinolinone gave excellent to good yields of the corresponding hydroperoxides, which were gradually degraded by exposure to the metal initiator after the reaction to...

We report on the formation of hydrogel layers on conducting substrates via a simple electrochemical route. Free-radical polymerization is initiated by an electron transfer from the substrate to a redox-active initiator. Gels of the thermally responsive material poly-N-isopropylacrylamide (p-NIPAM) with a thickness between 25 and 250 nm were produced and characterized. The gels adhere well to th...

Abstract Slow-release polycarboxylate superplasticizer was synthetic under room-temperature conditions, a free radical copolymerization reaction occurred the action of redox initiator, and optimal preparation process temperature effect were discussed in detail. The results show that best (EP-15) is: acid-to-ether ratio is 1.89, amount NaH 2 PO 2.27%, appropriate 15-25°C, suitable macromonomer E...

Abstract To improve the adaptability of polycarboxylic acid water reducer to different machine-made sands, this paper adopts methacrylic and m-aminobenzene sulfonic obtain esterification monomer then conducts free radical polymerization with highly active polyether macromonomer unsaturated silane under action redox initiator system synthesize green adaptable reducer. The test results showed tha...

In this paper, the aqueous copolymer dispersions of methyl (meth)acrylate-grafted poly(vinyl alcohol) are in situ synthesized and studied as a promising platform for deposition thin films with advanced applications. A series varied structure composition obtained at mild reaction conditions by carrying out redox polymerization different monomer-to-PVA ratio initiator concentration. The colloidal...