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포스터 발표 - 고분자공업분과 : PolyHEMA ( poly ( 2- hydroxyethyl methacrylate ) ) Beads 제조에 관한 형태학적 연구
임재홍,허형회,김환기,한학수,김중현,조영일 ( Jae Hong Im . Hiung Hoi Hur,Whan Gi Kim,Hak Soo Han,Jung Hyun Kim,Yung Il Joe ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3
N/A We investigated the effect of 1-octhanol and PVP(poly(N-vinyl-2-pyrrolidon) K-90) on the changes of shape, size distribution, porosity of PolyHEMA beads, which were prepared by suspension polymerization. As the concentration of 1-octhanol increases, the shape of PolyHEMA beads becomes irregular and the average size of the beads grows. Also the porosity and the average radius of PolyHEMA beads are increased. Increased PVP concentration makes average radius small but the effect can be ignored when the concentration is over 3 %. The porosity gets a gains of nearby 25 % as its concentration increases. But it does not affect on the shape.
PolyHEMA ( poly ( 2- hydroxyethyl methacrylate ) ) Beads 제조에 관한 형태학적 연구
임재홍,허형회,김환기,한학수,김중현,조영일 ( Jae Hong Im . Hiung Hoi Hur,Whan Gi Kim,Hak Soo Han,Jung Hyun Kim,Yung Il Joe ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1997 No.0
N/A We investigated the effect of 1-octhanol and PVP(poly(N-vinyl-2-pyrrolidon) K-90) on the changes of shape, size distribution, porosity of PolyHEMA beads, which were prepared by suspension polymerization. As the concentration of 1-octhanol increases, the shape of PolyHEMA beads becomes irregular and the average size of the beads grows. Also the porosity and the average radius of PolyHEMA beads are increased. Increased PVP concentration makes average radius small but the effect can be ignored when the concentration is over 3 %. The porosity gets a gains of nearby 25 % as its concentration increases. But it does not affect on the shape.
김환기,김상필,김선호 건국대학교 자연과학연구소 1998 建國自然科學硏究誌 Vol.9 No.1
The branched polycarbonate was prepared from bisphenol A and trihydroxphenyl co-monomers in batch reactors. The polymerization was based upon phosgenation, followed by condensation with triethylamine as a catalyst. The polymers were characterized by differential scanning calorimetry(DSC), gel permeation chromatography(GPC), and thermogravimetric analyses(TGA). The relative kinetic studies of branched polycarbonate system that in polycondensation steps the reaction rates are more dependent on the content of branching agent than the corresponding linear polycarbonate. These results illustrate the branched polycarbonate was predominantly formed cyclic oligomers in terms of trihydroxyphenyl comonomer. The melt index ratio(MIR) of branched polycarbonates obtained was in the range of 20~25, which are compatible with application of blow molding.
PolyHEMA (poly (2- hydroxyethyl methacrylate)) Beads 제조에 관한 형태학적 연구
김중현,김환기,조영일,한학수,임재홍,허형회 한국공업화학회 1997 응용화학 Vol.1 No.2
We investigated the effect of 1-octhanol and PVP(poly(N-vinyl-2-pyrrolidon) K-90) on the changes of shape, size distribution, porosity of PolyHEMA beads, which were prepared by suspension polymerization. As the concentration of 1-octhanol increases, the shape of PolyHEMA beads becomes irregular and the average size of the beads grows. Also the porosity and the average radius of PolyHEMA beads are increased. Increased PVP concentration makes average radius small but the effect can be ignored when the concentration is over 3 %. The porosity gets a gains of nearby 25 % as its concentration increases. But it does not affect on the shape.