Synthesis and Characterization on a Kind of Polycarboxylate Superplasticizer

2014 ◽  
Vol 989-994 ◽  
pp. 228-232
Author(s):  
Xing Li ◽  
Guang Jun Zheng ◽  
Yao Bi ◽  
Cheng Fei Fu ◽  
Ming Hua Yuan ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Acrylic Acid ◽  
Chain Transfer ◽  
Thioglycolic Acid ◽  
High Water ◽  
Ammonium Persulfate ◽  
Synthesis And Characterization ◽  
Polyoxyethylene Ether ◽  
Polycarboxylate Superplasticizer ◽  
Gel Permeation

This study was undertaken to evaluate a new kind of polycarboxylate superplasticizer .Used polyoxyethylene ether (TPEG), acrylic acid (AA) as the monomer, ammonium persulfate (APS) as initiator, thioglycolic acid (TGA) as chain transfer agent, synthesised polycarboxylate superplasticizer with high water reducing rate. The effect of admixtures on fluidity and concrete slump were discussed in this paper. The structure of carboxylic acid water reducing agent was characterized by IR spectra and Gel permeation chromatography.This investigation also evaluated the influence of different serials of polyoxyethylene ether (TPEG), the dosage of acrylic acid (AA) and ammonium persulfate (APS).

The Preparation of Calcium Carbonate Modified High Water-Absorbing Resin

2014 ◽  
Vol 1035 ◽  
pp. 296-302
Author(s):  
Qi Shi ◽  
Qing Luo Meng ◽  
Nong Wang
Keyword(s):  
Calcium Carbonate ◽  
Acrylic Acid ◽  
Dry Weight ◽  
High Water ◽  
Ammonium Persulfate ◽  
Sodium Acrylate ◽  
Cross Linking ◽  
Optimum Process ◽  
Process Conditions ◽  
Modified Resin

The poly (sodium acrylate/acrylic acid) water-absorbing resin was prepared by aqueous solution polymerization with acrylic acid (AA) as the monomer, calcium carbonate as the modified additives, N, N-methylene double acrylamide (NMBA) as cross-linking agent, ammonium persulfate (APS)/sodium sulfite oxidation reduction type initiator. It was found that the adsorption performance of absorbent resin modified by calcium carbonate strengthened obviously. Orthogonal and single factor experiment were used to establish the optimum parameters related to the product preparation. The best process conditions on water-absorbing properties of the modified resin was obtained. Using 150mL acrylic acid as a benchmark, the result show the optimum process conditions: the reaction temperature is 55°C, the mass fraction of monomer is 20%, the neutralization degree is 45%, modified additive dosage is 10 g, the dosage of cross-linking agent is 0.1%, and the initiator dosage is 2.0%, respectively. After made under the optimum process conditions, the water-absorbing rate of the modified resin was 676.6 times the dry weight.

Preparation and Cement Fluidity of Slow-Release Polycarboxylate-Type Superplasticizer

2011 ◽  
Vol 399-401 ◽  
pp. 1307-1311 ◽  
Author(s):  
Xia Lv ◽  
Cheng Bing Yu ◽  
Wen Ying Qi
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Acrylic Acid ◽  
High Performance ◽  
Slow Release ◽  
Thioglycolic Acid ◽  
Ammonium Persulfate ◽  
Allyl Ether ◽  
Molecular Weight Regulator

High performance polycarboxylate-type superplasticizer (PCSP) was synthesized with acrylic acid (AA), polyethylene glycol allyl ether (APEG) and one monomer of methyl acrylate (MA), methacrylate acid (MAA), acrylamide (AM), and ethyleneglycol dimethacrylate (EGDMA). Ammonium persulfate and thioglycolic acid, as an initiator and a molecular weight regulator respectively, were used for radical polymerization in aqueous solution. Influence of superplasticizer on the cement fluidity of grout was investigated. The results showed that plasticizer admixture compounded with EGDMA-APEG-AA had excellent dispersibility and slump retention.

scholarly journals Synthesis and Characterization of Poly(NIPAM-co-AA) Polymers Possessing Perfluorinated Side Chains and Chemically Linked Pyrene Labels

2012 ◽  
Vol 27 ◽  
pp. 67-73
Author(s):  
Megh Raj Pokhrel ◽  
Stefan H. Bossmann
Keyword(s):  
Acrylic Acid ◽  
Ftir Spectroscopy ◽  
Synthesis And Characterization ◽  
Side Chains ◽  
Pyrene Fluorescence ◽  
Gel Permeation

The synthesis of Poly(n-isopropylacrylamide–co-acrylic acid)/-Poly(NIPAM-co-AA) polymers featuring perfluorinated side chains as well as chemically linked pyrene fluorescence labels has been reported. The resulting polymers have been characterized with the aid of UV/VIS, FTIR spectroscopy and Gel permeation chromatography.DOI: http://dx.doi.org/10.3126/jncs.v27i1.6663 J. Nepal Chem. Soc., Vol. 27, 2011 67-73 

The Role of the Initiator System in the Synthesis of Acidic Multifunctional Nanoparticles Designed for Molecular Imprinting of Proteins

2020 ◽  
Vol 65 (1) ◽  
pp. 28-41
Author(s):  
Marwa Aly Ahmed ◽  
Júlia Erdőssy ◽  
Viola Horváth
Keyword(s):  
Acrylic Acid ◽  
Binding Affinity ◽  
Molecular Imprinting ◽  
Low Temperatures ◽  
Ammonium Persulfate ◽  
Sodium Bisulfite ◽  
Multifunctional Nanoparticles ◽  
High Affinity ◽  
Initiator System

Multifunctional nanoparticles have been shown earlier to bind certain proteins with high affinity and the binding affinity could be enhanced by molecular imprinting of the target protein. In this work different initiator systems were used and compared during the synthesis of poly (N-isopropylacrylamide-co-acrylic acid-co-N-tert-butylacrylamide) nanoparticles with respect to their future applicability in molecular imprinting of lysozyme. The decomposition of ammonium persulfate initiator was initiated either thermally at 60 °C or by using redox activators, namely tetramethylethylenediamine or sodium bisulfite at low temperatures. Morphology differences in the resulting nanoparticles have been revealed using scanning electron microscopy and dynamic light scattering. During polymerization the conversion of each monomer was followed in time. Striking differences were demonstrated in the incorporation rate of acrylic acid between the tetramethylethylenediamine catalyzed initiation and the other systems. This led to a completely different nanoparticle microstructure the consequence of which was the distinctly lower lysozyme binding affinity. On the contrary, the use of sodium bisulfite activation resulted in similar nanoparticle structural homogeneity and protein binding affinity as the thermal initiation.

scholarly journals Regioselective Base-induced Condensations of Acrylic Acid Derivatives

1999 ◽  
Vol 23 (3) ◽  
pp. 174-175
Author(s):  
E. Abdel-Ghani
Keyword(s):  
Carboxylic Acid ◽  
Acrylic Acid ◽  
Dicarboxylic Acid ◽  
Ethyl Acetoacetate ◽  
Tobacco Necrosis Virus ◽  
Necrosis Virus ◽  
Antiviral Activities

The orientation of cyclization of the reaction of methyl aroylacrylate (1) and aroylacrylic acid (8) with ethyl acetoacetate and/or thiourea leading to the formation of 4-aroylmethylcyclopentane-1,3-dione (2) 5-aryl-3-oxocyclohexene-1,2-dicarboxylic acid (9), 2-imino-5-aroylmethylthiazolidin-4-one (11) and 6-aryl-2-sulfonylpyrimidine-4-carboxylic acid (14) depends on the medium employed; some compounds show moderate antiviral activities against tobacco necrosis virus.

scholarly journals Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Absorption on Large Bibulous Stone Powder

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2736
Author(s):  
Zuiliang Deng ◽  
Guimin Lu ◽  
Lefeng Fu ◽  
Weishan Wang ◽  
Baicun Zheng
Keyword(s):  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Zeta Potential ◽  
Mechanism Of Action ◽  
Water Consumption ◽  
Pore Volume ◽  
High Water ◽  
Hydrodynamic Diameter ◽  
Coarse Aggregates ◽  
Polycarboxylate Superplasticizer

The aim of this paper is to study the adsorption behavior of polycarboxylate superplasticizers (PCE) on coarse aggregates with a property of high water consumption (above 2%). The coarse aggregates were ground into a powder to create large bibulous stone powder, and it was observed that significant amounts of the ether-based PCE were absorbed onto large bibulous stone powder. The adsorption rate immediately reached a maximum after 5 min and then gradually decreased until an equilibrium absorption was established after 30 min. Zeta potential, infrared spectroscopy, and thermogravimetric analysis (TGA) measurements confirmed that the polycarboxylate superplasticizer adsorbed on the surface of the stone powder. Hydrodynamic diameter measurements showed that the polycarboxylate superplasticizer molecules were smaller than pore size, and the surface area and pore volume were reduced by the polymer incorporation in the pores.

Sign in / Sign up

Export Citation Format

Share Document