Synthesis and characterization of star-shaped polymers by atom transfer radical polymerization원자이동 라디칼 중합을 이용한 성형 고분자의 합성과 특성에 관한 연구

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dc.contributor.advisorKim, Sang-Youl-
dc.contributor.advisor김상율-
dc.contributor.authorKim, Mi-Young-
dc.contributor.author김미영-
dc.date.accessioned2011-12-13T04:49:01Z-
dc.date.available2011-12-13T04:49:01Z-
dc.date.issued2003-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=180050&flag=dissertation-
dc.identifier.urihttp://hdl.handle.net/10203/31939-
dc.description학위논문(석사) - 한국과학기술원 : 화학과, 2003.2, [ xi, 82 p. ]-
dc.description.abstractPrecisely controlled star-shaped polymers have been attracting interest as new polymeric materials due to their unique properties resulting from three-dimensional structures. However, construction of star-shaped polymers requires elaborated synthetic steps such as coupling of several well controlled linear polymer chains with a core molecule. Recently developed atom transfer radical polymerization opens a way to make star-shaped polymers efficiently. In this study, the star-shaped poly(MMA)s with well-defined molecular weight (~16,000) and narrow polydispersity (<1.25) were prepared in high yield by $NiBr_2(PPh_3)_2$. The polymerizations were carried out with multifunctional initiators which were prepared from 2-bromoisobutyryl bromide and phloroglucinol or pentaerithritol in bulk at 90 ℃. The star-shaped poly(MMA-co-HEMA)s with well-defined molecular weight (~12,000) and narrow polydispersity (<1.30) were also prepared in high yield by CuBr/2,2’-bipyridine. The polymerizations were carried out with multifunctional initiators which were prepared from 2-bromoisobutyryl bromide and phloroglucinol or pentaerithritol in N,N-dimethyl formamide at 90℃. Investigation of the physical properties of the polymers revealed that the synthesized well-defined star-shaped poly(MMA-co-HEMA)s had a higher thermal stability than the poly(MMA) presumably due to the increased hydrogen bonding by hydroxyl groups of HEMA monomer unit.eng
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectliving-
dc.subjectatom transfer radical polymerization-
dc.subjectstar-shaped polymers-
dc.subject합성-
dc.subject성형 고분자-
dc.subject원자이동 라디칼 중합-
dc.titleSynthesis and characterization of star-shaped polymers by atom transfer radical polymerization-
dc.title.alternative원자이동 라디칼 중합을 이용한 성형 고분자의 합성과 특성에 관한 연구-
dc.typeThesis(Master)-
dc.identifier.CNRN180050/325007-
dc.description.department한국과학기술원 : 화학과, -
dc.identifier.uid020013073-
dc.contributor.localauthorKim, Sang-Youl-
dc.contributor.localauthor김상율-
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