DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Cho, I-Whan | - |
dc.contributor.advisor | 조의환 | - |
dc.contributor.author | Jo, Su-Yeon | - |
dc.contributor.author | 조수연 | - |
dc.date.accessioned | 2011-12-15 | - |
dc.date.available | 2011-12-15 | - |
dc.date.issued | 1999 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=156299&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/49771 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 신소재공학과, 1999.8, [ x, 105 p. ] | - |
dc.description.abstract | New side-chain liquid crystalline polymers with flexible spacer backbone were prepared by ring opening metathesis polymerization of cyclododecadiene derivative with tungsten-based catalyst systems. Prepared monomers were 4,8-cyclododecadienyl 4````-methoxybiphenyl terephthalate(CDDMBT), 4,8-cyclododecadienyl 4````-cyanobiphenyl terephthalate(CDDCBT), 4,8-cyclododecadienyl cholesteryl terephthalate (CDDCHOT), 4,8-cyclododecadienyl 4````-methoxyphenyl terephthalate (CDDMPT), and 4,8-cyclododecadienyl 4````-methoxybiphenyl carboxylate (CDDMBC). Double bonds in the polymer backbone were hydrogenated with $H_2$/Pd(C). The number average molecular weight of the polymer was $1.1 \times 10^4 \sim 1.5 \times 10^4$ relative to polystyrene standards as determined by GPC. The thermal properties of the monomers and the polymers were analyzed by differential scanning calorimetry(DSC), cross-polarized optical microscopy, and X-ray diffraction analysis. The monomers and polymers with 2-ring mesogenic group(CDDMPT and CDDMBC) showed no liquid crystallinity. On the other hand, 3- or more ring mesogenic system showed liquid crystallinity at their monomer and/or polymer. Particularly notable was that the liquid crystalline polymer exhibited much lower phase transition temperature than the monomer. 4,8-Cyclododecadienyl acetate (CDDA) and 4-cyclooctenyl acetate (COA) were prepared and polymerized. The number average molecular weight of the polymer was 10,500 ~ 23,000 and polydispersity Mw/Mn were 2.0 ~ 2.3 in 90 ~ 99 % conversion when Basset catalyst system used. The double bonds in the obtained polymer were hydrogenated by H2/Pd(C) or p-toluenesulfonyl hydrazide. Perfectly linear EVAL copolymers as a gas barrier film were prepared by ROMP of CDDA and COA followed by modification of hydrogenation and hydrolysis. Photo-alignment polymer with regular intervals between cinnamate groups were synthesized from linear EVAL copolymer by polymer reaction with cinnamoyl chloride.`` | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | ROMP | - |
dc.subject | Metathesis | - |
dc.subject | SCLCP | - |
dc.subject | Liquid crystal | - |
dc.subject | Ethylene | - |
dc.subject | 비닐 알코올 | - |
dc.subject | 에틸렌 | - |
dc.subject | 메타세시스 | - |
dc.subject | 측쇄형 액정 고분자 | - |
dc.subject | 액정 | - |
dc.title | Synthesis and properties of microstructure-controlled ethylene-vinyl alcohol copolymers and their derivatives | - |
dc.title.alternative | 미세구조가 조절된 에틸렌-비닐 알코올 공중합체 및 그 유도체의 합성과 물성 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 156299/325007 | - |
dc.description.department | 한국과학기술원 : 신소재공학과, | - |
dc.identifier.uid | 000959507 | - |
dc.contributor.localauthor | Jo, Su-Yeon | - |
dc.contributor.localauthor | 조수연 | - |
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