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http://dx.doi.org/10.7317/pk.2012.36.2.216

Synthesis and Application of cPSMA-PSMA Microcapsule Absorbent for Cement Mortars  

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.36, no.2, 2012 , pp. 216-222 More about this Journal
Abstract
We synthesized microcapsule absorbent with crosslinked poly(styrene-$alt$-maleic anhydride) (PSMA) as a core and PSMA as a shell by a precipitation polymerization method for the delayed absorption of excess water in cement mortar. cPSMA-PSMAs with core-shell structure were synthesized with ratios of 1/1, 1/2 and 1/3 as core monomer mass to shell monomer mass to control shell thickness. We observed the hydrolysis of PSMA in cement-saturated aqueous solution by a FTIR spectrometer. We observed good core-shell structure microcapsules for 1/2(cPSMA #3), but observed incomplete core-shell structure for 1/1(cPSMA #2) and 1/3(cPSMA #4) of core/shell monomer ratios. The swelling ratio of cPSMA #3 in cement-saturated aqueous solution was increased until 20 min. After that it was decreased until 2 hrs swelling time, and they started to increase again. The viscosities of cement paste with cPSMA #3 microcapsules were very slowly increased until 1 hr and increased fast after 1.5 hrs. Cement mortar with 0.5 wt% cPSMA #1 having only core part showed about 5% increase in compressive strength compared to that of plain cement mortar. cPSMA #3 added cement mortar showed the highest compressive strength with 7% increase.
Keywords
poly(styrene-$alt$-maleic anhydride); hydrolysis reaction; core-shell; microcapsule; absorbent;
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