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Synthesis of Surface Crosslinked Poly(sodium acrylate) for Delayed Absorption in Cement Solution  

Hwang, Ki-Seob (Department of Chemical Engineering, Keimyung University)
Jang, Seok-Soo (Department of Civil Engineering, Keimyung University)
Jung, Yong-Wook (Department of Civil Engineering, Keimyung University)
Lee, Seung-Han (Department of Civil Engineering, Keimyung University)
Ha, Ki-Ryong (Department of Chemical Engineering, Keimyung University)
Publication Information
Polymer(Korea) / v.35, no.4, 2011 , pp. 363-369 More about this Journal
Abstract
To study the effect of incorporation of a surface crosslinking layer on a crosslinked poly (sodium acrylate) (cPSA) absorbent with ethylene glycol dimethacrylate CEGDMA), we synthesized several surface crosslinked cPSAs with EGDMA by an inverse emulsion polymerization method to delay the absorption of excess water in concrete, Liquid paraffin was used as a continuous phase. cPSA was synthesized with acrylic acid (AA) neutralized with aqueous 8 M sodium hydroxide solution as a monomer, N,N-methylene bisacrylamide (MBA) as crosslinking agent and ammonium persulfate (APS) and sodium metabisulfite (SMBS) as a redox initiator system by inverse emulsion polymerization. FTIR spectroscopy was used to characterize $Ca^{2+}$ ion interaction with cPSA and cPSA-EGDMAs. The swelling ratios of synthesized absorbents were evaluated from the absorption in deionized water, cement saturated aqueous solution and aqueous solution of calcium hydroxide (pH 12). Equilibrium swelling times for cPSA and surface crosslinked cPSA with EGDMA were 2 and 3 hrs, respectively. We also observed an increase in setting time of the cement and an increase in the compressive strength of mortar by addition of the synthesized cPSA-EGDMA.
Keywords
absorbent; delayed absorption; redox initiator; inverse emulsion polymerization; swelling ratio;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
Times Cited By Web Of Science : 1  (Related Records In Web of Science)
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