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조창기 ( Chang Gi Cho ) 한국공업화학회 1996 공업화학 Vol.7 No.4
폴리(알킬아크릴레이트-g-카프로락톤) 그라프트 공중합체를 합성하였으며, 이것을 폴리카보네이트(PC)/폴리(아크릴로니트릴-부타디엔-스티렌)(ABS) 블렌드의 상용화제로 사용하였다. PC나 ABS와 비상용성인 폴리 알킬아크릴레이트 주사슬을 갖는 그라프트 공중합체를 사용하였으며 이것을 PC/ABS의 계면에 위치시키는 것을 목표로 하였다. 그라프트 공중합체를 1중량부 포함하는 블렌드물은 충격 강도는 물론 파단 인장 강도에서 아주 향상된 값을 보였으며, 1/8인치 시편에서의 충격 강도 향상이 두드러졌다. 전자현미경에 의한 형태학적인 분석 결과 그라프트 공중합체의 존재가 좀더 매끄러운 PC/ABS 계면을 형성하게 하는 것으로 나타났다. Poly(alkyl acrylate-g-caprolactone) graft copolymers were prepared, and they were applied as compatibilizing agents for polycarbonate (PC) / poly(acrylonitrile-butadiene-styrene) (ABS) blends. The incompatible poly(alkyl acrylate) segment was incorporated into the graft copolymer in order to localize the copolymer at the PC/ ABS interface. The blend containing 1 phr of the copolymer showed remarkable improvement in impact strength as well as in elongation at break. Impact improvement was more pronounced with a thinner test specimens of 1/8 inch thickness. Morphological study showed that the presence of the graft copolymer led to a smoother PC/ABS interface due to the interfacial enrichment of the graft copolymer.
조창기 ( Chang Gi Cho ) 한국공업화학회 1991 공업화학 Vol.2 No.3
Carbocationic polymerization is widely applied to prepare polymers from electron-rich monomers. The reaction is usually uncontrollable due to many side reactions and explosively fast rate of polymerization. In a living polymerization, however, the reaction is controlled as designed, and many workers reported many successful cases recently. In this review several ways of living carbocationic polymerization were illustrated, and they were connected together under a basic principle.
계면중합에 의한 폴리우레아 마이크로캡슐의 제조 -이소시아네이트의 종류에 따른 마이크로캡슐의 생성수율과 열적특성-
이동선,조창기,Lee, Dong-Sun,Cho, Chang-Gi 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.5
In this study, a series of polyurea microcapsules were prepared by interfacial polyconden-sation using various isocyanates as the oil soluble monomer and diethylenetriamine as the water soluble monomer. Nonionic surfactant, NP-10, was used as an emulsifier. The yields of microcapsules from aliphatic isocyanates were higher than those of microcapsules from aromatic isocyanates due to the flexibility of the aliphatic chains. Polyurea microcapsules obtained from aliphatic isocyanates were stable well above 25$0^{\circ}C$ and showed better thermal stability compared to those obtained from aromatic analogs.
계면중합에 의한 폴리우레아 마이크로캡슐의 제조 -분산상의 점도에 따른 마이크로캡슐의 크기 변화-
이동선,금창헌,조창기,Lee, Dong-Sun,Kum, Chang-Hun,Cho, Chang-Gi 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.5
Polyurea microcapsules were prepared by interfacial polycondensation using diisocyanates as the oil soluble monomers and diethylenetriamine as the water soluble monomer. NP-10, nonionic surfactant, was used as an emulsifier. Toluene was used as the diluent of the diisocyanates as well as the means to prepare microcapsule with empty shell. Number average particle size of the microcapsule showed a linear relationship with the viscosity of the dispersed oil phase. Polyurea microcapsule with thinner shell thickness showed good thermal stability well above $250^{\circ}C$ and showed same thermal stability compared to that with thicker shell thickness.