Article
  • Synthesis and Application of cPSMA-PSMA Microcapsule Absorbent for Cement Mortars
  • Hwang KS, Jang SS, Jung YW, Lee SH, Ha KR
  • 시멘트 모르타르용 cPSMA-PSMA 마이크로캡슐 흡수제 제조 및 적용
  • 황기섭, 장석수, 정용욱, 이승한, 하기룡
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.

콘크리트 제조 시 잉여수의 지연 흡수를 위하여 가교된 crosslinked poly(styrene-alt-maleic anhydride)(PSMA)가 core이고, PSMA가 shell인 마이크로캡슐 흡수제를 침전중합법으로 제조하였다. Shell의 두께를 조절하기 위하여 (core 단량체의 질량)/(shell 단량체의 질량) 비가 1/1, 1/2 및 1/3이 되도록 하여 cPSMA-PSMA를 중합하였다. FTIR spectrometer를 사용하여 시멘트 포화 수용액 내에서 PSMA가 가수 분해 반응이 일어남을 확인하였다. TEM 분석으로 core/shell 단량체 비가 1/2(cPSMA #3)일 때 마이크로캡슐 구조를 잘 형성하는 것을 관찰하였고, 1/1(cPSMA #2)과 1/3(cPSMA #4)은 불완전한 마이크로캡슐 구조임을 관찰하였다. 시멘트 포화 수용액에서 cPSMA #3의 팽윤비는 초기 20분까지 증가한 후 2시간까지는 감소하였으며, 그 후 24시간까지는 다시 증가하였다. 제조된 cPSMA #3을 시멘트 페이스트에 첨가한 후 시간에 따른 점도 측정 결과 1시간까지는 거의 변화가 없었지만, 그 후 급격한 점도 증가가 일어났다. Core로만 구성된 cPSMA #1을 0.5 wt% 첨가한 시멘트 모르타르의 압축강도는 무첨가 시멘트 모르타르에 비해 약 5% 높게 나타났으며, cPSMA #3을 첨가한 모르타르는 약 7% 증가로 가장 높게 나타났다.

Keywords: poly(styrene-alt-maleic anhydride); hydrolysis reaction; core-shell; microcapsule; absorbent.

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2012; 36(2): 216-222

    Published online Mar 25, 2012

  • Received on Jul 12, 2011
  • Accepted on Sep 7, 2011