DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Sang-Youl | - |
dc.contributor.advisor | 김상율 | - |
dc.contributor.author | Kim, Mi-Young | - |
dc.contributor.author | 김미영 | - |
dc.date.accessioned | 2011-12-13T04:49:01Z | - |
dc.date.available | 2011-12-13T04:49:01Z | - |
dc.date.issued | 2003 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=180050&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/31939 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 화학과, 2003.2, [ xi, 82 p. ] | - |
dc.description.abstract | Precisely 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.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | living | - |
dc.subject | atom transfer radical polymerization | - |
dc.subject | star-shaped polymers | - |
dc.subject | 합성 | - |
dc.subject | 성형 고분자 | - |
dc.subject | 원자이동 라디칼 중합 | - |
dc.title | Synthesis and characterization of star-shaped polymers by atom transfer radical polymerization | - |
dc.title.alternative | 원자이동 라디칼 중합을 이용한 성형 고분자의 합성과 특성에 관한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 180050/325007 | - |
dc.description.department | 한국과학기술원 : 화학과, | - |
dc.identifier.uid | 020013073 | - |
dc.contributor.localauthor | Kim, Sang-Youl | - |
dc.contributor.localauthor | 김상율 | - |
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