DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Cho, I-Whan | - |
dc.contributor.advisor | 조의환 | - |
dc.contributor.author | Lee, Ju-Yeon | - |
dc.contributor.author | 이주연 | - |
dc.date.accessioned | 2011-12-13T04:24:06Z | - |
dc.date.available | 2011-12-13T04:24:06Z | - |
dc.date.issued | 1984 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=60831&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/31240 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 화학과, 1984.2, [ xiii, 138 p. ] | - |
dc.description.abstract | In the study of synthesis and property of head-to-head alternating copolymer of various monomers, 2-methoxy-6-ethoxy-5-cyano-3,4-dihydro-2H-pyran ($\underline{1}a$), 2,6-diethoxy-5-cyano-3,4-dihydro-2H-pyran ($\underline{1}b$) and 2-n-butoxy-6-ethoxy-5-cyano-3,4-dihydro-2H-pyran ($\underline{1}c$) were prepared by [4+2] head-to-head (H-H) cycloaddition reaction of ethyl α-cyanoacrylate with the corresponding vinyl ethers. 2-Methoxy-6-methyl-3,4-dihydro-2H-pyran ($\underline{1}d$), 2-ethoxy-6-methyl-3,4-dihydro-2H-pyran ($\underline{1}e$), 2-n-butoxy-6-methyl-3,4-dihydro-2H-pyran ($\underline{1}f$) and 2-ethoxy-6-phenyl-3,4-dihydro-2H-pyran ($\underline{1}$g) were prepared from the corresponding vinyl ketones and alkyl vinyl ethers. $\underline{1}a$, $\underline{1}b$, $\underline{1}c$, $\underline{1}d$, $\underline{1}e$, $\underline{1}$f and $\underline{1}g$ were ring-opening polymerized by cationic or anionic catalysts to obtain high molecular weight polymers of H-H alternating sequence. For the comparison the copolymers of head-to-tail (H-T) structures were also prepared by free radical copolymerization of the mixtures of the corresponding monomers. The H-H copolymers exhibited only minor difference in their $^1H$ NMR and IR spectra but in $^{13}C$ NMR spectra H-H copolymers showed significant difference exhibiting the signal attributable to the extra backbone methylene carbon. Also to note was that Tg values of H-H copolymers were always higher than those of the corresponding H-T copolymers. Decomposition temperatures of H-H copolymers were usually lower than those of H-T copolymers. All the H-H and H-T copolymers were soluble in common solvents. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.title | Syntheses of alternating head-to-head copolymers | - |
dc.title.alternative | 교대 머리- 머리 공중합체의 합성 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 60831/325007 | - |
dc.description.department | 한국과학기술원 : 화학과, | - |
dc.identifier.uid | 000795211 | - |
dc.contributor.localauthor | Cho, I-Whan | - |
dc.contributor.localauthor | 조의환 | - |
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