공업화학 (Applied Chemistry for Engineering)

  • 제16권3호
  • /
  • Pages.397-402
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  • 2005
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  • 1225-0112(pISSN)
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  • 2288-4505(eISSN)
한국공업화학회 (The Korean Society of Industrial and Engineering Chemistry)
권호 표지

열 감응성 Poly(styrene-co-N-isopropylacrylamide) 마이크로겔의 합성 및 특성

Synthesis and Characterization of Thermo Sensitive Poly(styrene-co-N-isopropylacrylamide) Microgels

  • Cho, Suk Hyeong (Dipartment of Medical Materials, Hejeon Collige) ;
  • Kim, Kong Soo (Department of Industrial and Engineering Chemistry, Chungbuk National University) ;
  • Jung, Tea Uk (Department of Industrial and Engineering Chemistry, Chungbuk National University)
  • 투고 : 2005.01.20
  • 심사 : 2005.03.28
  • 발행 : 2005.06.10
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초록

Core-shell 형의 Poly(styrene-co-N-isopropylacrylamide) (poly(St-co-NIPAm)) 마이크로겔은 과항상칼륨(KPS)을 개시제로 사용하여 styrene (St)과 N-isopropylacrylamide (NIPAm)의 무유화 유화중합으로 제조하였다. St/NIPAm의 비, 모노머의 농도, 가교제의 농도에 따른 입자크기의 영향을 조사하였으며 고분자 마이크로겔의 온도에 따른 열감응성을 조사하였다. 마이크로겔의 입자 크기는 NIPAm의 몰비에 따라 증가하였으며 마이크로겔 분산용액의 투과도가 하한임계온도 이상($32{\sim}34^{\circ}C$)에서는 급격히 감소였다. 수용액 중에서 마이크로겔의 팽윤성은 모노머인 NIPAm의 농도가 증가할수록 증가하였으며 가교제의 농도에 따라서 감소하였다.

Core-shell Poly(styrene-co-N-isopropylacrylamide) (poly(St-co-NIPAm) was prepared by soap-free emulsion polymerization of styrene (St) and N-isopropylacrylamide (NIPAm) in aqueous solution with potassium persulfate (KPS) as an initiator. The effects of St/NIPAm ratio, concentrations of monomer and crosslinker were studied. Also, Thermo sensitivity of microgels prepared was investigated. Particle size of microgels increased with increasing mol ratio of NIPAm to styrene. Transmittance of the microgel dispersion decreased rapidly when heated above a low critical solution temperature (near $32{\sim}34^{\circ}C$, cloud point). Swelling ratio of the microgel increased with increasing of the concentration of monomer (NIPAm) and decreased proportional to the concentration of crosslinker.

키워드

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