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Lee, Chang Hee,Choe, Soonja,Cha, Yoon Jong 한국공업화학회 1997 Journal of Industrial and Engineering Chemistry Vol.3 No.4
In order to replace the role of maleated [styrene-block-(ethylene-co-butylene)-block-styrene](SEBS-gMA) triblock copolymer by the recycled poly(vinyl butyral)(PVB) film as a toughening agent or an impact modifier, the influence of scrap PVB film on the phase morphology and mechanical properties of the binary nylon 6/SEBS-g-MA blends has been investigated. In Nylon 6 with 20 wt% PVB film, the PVB particles are dispersed in the Nylon 6 matrix as spherical particles of which the size is approximately 1.5㎛ in diameter. For the tertiary Nylon 6/SEBS-g-MA/PVB blends, under the fixed content of SEBS-g-MA or PVB at the most 20 wt%, the dispersed particles increased with the PVB content. In particular, 12.5 wt% PVB influences the particle size and the phase morphology of the tertiary blends. Although the tertiary blends have lower impact strength than the binary Nylon 6/SEBS-g-MA blends, the impact strength is still much higher than that of Nylon 6 homopolymer. Thus, recycled PVB film is economically useful as a toughening agent or an impact modifier by partially replacing the role of SEBS-g-MA in Nylon 6 matrix.
Core-shell 형태의 고분자/금속 복합 나노 입자의 제조와 활용
심상은,최순자 한국공업화학회 2003 공업화학 Vol.14 No.2
고분자와 금속과의 조합을 통해 제조되는 core-shell 형태를 가지는 나노입자는 선택되어지는 고분자와 무기소재의 종류에 따라서 마그네틱 재료, 전기재료, 촉매 및 광학재료 등에 사용될 수 있도록 다양한 화학적, 물리적 성질을 가지게 되어 의료분야, 생화학, 촉매, 코팅 등의 다양한 분야에 적용될 수 있기 때문에 이에 대한 연구가 최근들어 활발히 진행이 되고 있다. 본 논문에서는 최근 나노기술의 발달에 부용하여 이에 요구되어지는 소재로서 각광을 받고 있는 이러한 고분자/금속 복합체 나노입자에 관한 연구동향, 다양한 제조방법과 이들의 활용분야에 대하여 기술하였다. The core-shell type nanoparticles composed of polymer and metal can possess various chemical and physical properties by choosing proper polymer and metal pairs. Due to their magnetic, electrical, catalytic, and optical properties, polymer/metal composite nanoparticles can be used as medical, biochemical, catalyst, and coating materials. Recently, enormous attention has been paid to such nanoparticles in conformity with the fast development of nanotechnology. In the paper, research trend, preparation methods, and the applications of polymer/metal composite namoparticles are described.
Properties of the Blends of Ethylene-Vinyl Acetate and Ethylene-$\alpha$-Olefins Copolymers
Park Soochul,Yim Chaiseok,Lee Byung H.,Choe Soonja The Polymer Society of Korea 2005 Macromolecular Research Vol.13 No.3
The effect of the vinyl acetate (VA) content on the thermal, viscoelastic, rheological, morphological and mechanical behaviors in various blends of ethylene-vinyl acetate (EVA)/ethylene-$\alpha$-olefin copolymers was investigated using 28, 22 and $15 mol\%$ of VA in EVA. In the DSC melting and crystallization thermograms of all of the EVA systems blended with ethylene-$\alpha$-olefin copolymers, discrete peaks were observed which were related to the constituents. In the dynamic mechanical thermal analysis, the storage modulus increased with increasing content of ethylene-$\alpha$-olefin copolymers. In addition, the transition regions relating to the tan bpeaks varied with the VA content. The crossover point between G' and G" varied depending on the VA contents, and shear-thinning was more prominent in the EVA/EtBC system. In the SEM investigation, a discrete phase morphology was observed in both the EVA/EtBC and EVA/EtOC blends, but the contrast improved with decreasing VA content. However, the tensile strength and modulus improved, but the elongation at break reduced with decreasing VA content, implying that the ethylene-$\alpha$-olefin copolymers play the role of reinforcing materials. Thus, the EVA and ethylene-$\alpha$-olefin components in the copolymers are immiscible in the molten and solid states, but are nevertheless mechanically compatible.
Preparation of poly(acrylamide)/MWNTs nanocomposite using carboxylated MWNTs
Hong, Jinho,Kook Hong, Chang,Choe, Soonja,Eun Shim, Sang Wiley Subscription Services, Inc., A Wiley Company 2007 Journal of polymer science Part A, Polymer chemist Vol.45 No.15
<B>Graphic Abstract</B> <P>Polyacrylamide/MWNTs nanocomposite is prepared using MWNTs functionalized with carboxylic acid or carboxylic anion groups. The modified MWNTs show significantly improved colloidal stability without aggregation in aqueous acrylamide solution. The solution was in-situ polymerized to give a well-dispersed PAAm/MWNTs nanocomposite.</P><P> <img src='wiley_img/0887624X-2007-45-15-POLA22122-gra001.gif' alt='wiley_img/0887624X-2007-45-15-POLA22122-gra001'> </P>
A novel synthesis of polymer brush on multiwall carbon nanotubes bearing terminal monomeric unit
Ha, Jin Uk,Kim, Myunghun,Lee, Jeongwoo,Choe, Soonja,Cheong, In Woo,Shim, Sang Eun Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of polymer science Part A, Polymer chemist Vol.44 No.21
<P>A novel approach to fabricate polymer brushes on the surface of carbon nanotubes (CNTs) is proposed. Carboxyl groups on the surface of chemically oxidized CNTs were reacted with hexamethylene diisocyanate, followed by a reaction with methacrylamide to give terminal vinyl groups-functionalized CNTs, so called “CNT-mer.” The synthetic procedure was investigated step-by-step and the synthesized CNT-mer was used to grow polystyrene (PS) from CNTs by a simple in situ polymerization in the presence of a thermal initiator. By employing <SUP>1</SUP>H NMR, X-ray photoelectron spectroscopy, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, and light scattering, the experimental results were verified. Using this approach, 45% PS with respect to CNTs are grafted on the surface of CNTs with about 4.0 nm thickness. This novel technique would provide a facile route to prepare tailor-made polymer brushes on the surface of CNTs. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44:6394–6401, 2006</P> <B>Graphic Abstract</B> <P>Reactive terminal groups are attached on the surface of carboxylated CNTs by reaction with hexamethylene diisocyanate and the following reaction with methacrylamide. Herein, the CNTs having the reactive vinyl groups are named “CNT-mer”. The synthesized CNT-mer is used to graft PS chains via a simple in situ polymerization.</P> <img src='wiley_img/0887624X-2006-44-21-POLA21738-gra001.gif' alt='wiley_img/0887624X-2006-44-21-POLA21738-gra001'>
Stable poly(methyl methacrylate-co-divinylbenzene) microspheres via precipitation polymerization
Yang, Sunhye,Shim, Sang Eun,Choe, Soonja Wiley Subscription Services, Inc., A Wiley Company 2005 Journal of polymer science Part A, Polymer chemist Vol.43 No.6
<B>Graphic Abstract</B> <P>Stable poly(MMA-co-DVB) microspheres were prepared by precipitation polymerization using acetonitrile as the main medium under various polymerization conditions including monomer and initiator concentrations. <img src='wiley_img/0887624X-2005-43-6-POLA20417-gra001.gif' alt='wiley_img/0887624X-2005-43-6-POLA20417-gra001'> </P>
검증자 기반의 Three - Party 키 교환 프로토콜
김해문(Haemun Kim),최영근(Yeonggeun Choe),김순자(Soonja Kim) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅰ
패스워드 기반 키 교환 프로토콜은 참여자들이 쉽게 기억할 수 있는 자신의 패스워드를 사용하므로 단순성, 편리성, 이동성의 장점 때문에 광범위하게 사용된다. 2000년에 Lin, Sun, Hwang[1]이 Steiner, Tsudik, Waidner[2]가 제안한 three-party EKE 프로토콜(STW-3PEKE)이 패스워드 추측 공격에 취약점을 증명하고 이를 개선한 서버의 공개키를 이용한 새로운 three-party EKE 프로토콜(LSH-3PEKE)을 제안했다. 2001년에는 Lin, Sun, Hwang[3]이 서버의 공개키를 사용하지 않는 새로운 three-party EKE 프로토콜(LSSH-3PEKE)을 제안했다. 본 논문에서는 검증자(verifier) 기반 즉 서버가 사용자의 패스워드를 저장하지 않고 패스워드에 의해 생성되는 검증자를 가지는 프로토콜을 제안하며 이전에 제안한 프로토콜의 안전성을 그대로 유지하면서 좀 더 간단하며 효율적인 프로토콜을 제시한다.
Lee Jung Min,Kim Ok Hyung,Shim Sang Eun,Lee Byung H.,Choe Soonja The Polymer Society of Korea 2005 Macromolecular Research Vol.13 No.3
Three dithioester-derived carboxyl acid functionalized RAFT(reversible addition-fragmentation chain transfer) agents, viz. acetic acid dithiobenzoate, butanoic acid dithiobenzoate and 4-toluic acid dithiobenzoate, were used in the RAFT bulk polymerization of styrene, in order to study the effects of the R-group structure on the living nature of the polymerization. By conducting the polymerization with various concentrations of the RAFT agents and at different temperatures, it was found that the R-group structure of the RAFT agents plays an important role in the RAFT polymerization; the bulky structure and radical stabilizing property of the R-group enhances the living nature of the polymerization and allows the polymerization characteristics to be well controlled.