DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Jhon, Mu-Shik | - |
dc.contributor.advisor | 전무식 | - |
dc.contributor.author | Jeon, Sang-Il | - |
dc.contributor.author | 전상일 | - |
dc.date.accessioned | 2011-12-13T04:24:12Z | - |
dc.date.available | 2011-12-13T04:24:12Z | - |
dc.date.issued | 1985 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=60870&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/31247 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 화학과, 1985, [ viii, 62 p. ] | - |
dc.description.abstract | PART A Dilute Solution Properties of Tactic Poly(2-Hydroxyethyl Methacrylate) Isotactic and syndiotactic poly(2-hydroxyethyl methacrylate) (PHEMA) have been prepared. Intrinsic viscosity-molecular weight relationships were established for the isotactic and syndiotactic PHEMA in N,N-dimethylformamide (DMF) at 25$^\circ$C by solution viscometry and light scattering. The unperturbed dimensions and interaction parameters have been examined in DMF, water, methanol, ethanol, and water-methanol (1:7 by volume) mixture for isotactic PHEMA and DMF, methanol, and water-methanol (1:7 by volume) mixture for syndiotactic PHEMA using the Stockmayer-Fixman representation. The results suggest that the compact random coil structure for isotactic PHEMA occurs in water solvent and isotactic PHEMA is more highly extended in polar solvents. PART B Effect of Ureas on the Viscometric Behavior of Water Soluble Isotactic Poly(2-Hydroxyethyl Methacrylate) Isotactic poly(2-hydroxyethyl methacrylate) (PHEMA) is soluble and has the compact random coil structure in water solvent. The effect of six ureas (thiourea, urea, methylurea, ethylurea, 1.3-dimethylurea, and tetramethylurea) on the viscometric behavior of aqueous solutions of isotactic PHEMA as a function of urea concentrations at 25$^\circ$C has been investigated. The compact random coil structure is found to disappear as ureas are added. The result is discussed in terms of water structure-breaking and -making of solutes, and hydrophobic interactions between hydrophobic groups. In addition, experiments were performed with aqueous isotactic PHEMA solution at four different temperatures. The temperature-dependant conformational behavior of isotactic PHEMA in pure water presents that the most compact conformation is occured at 20$^\circ$C among four different temperatures. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.title | Dilute solution properties of tactic poly(2-hydroxyethyl methacrylate) | - |
dc.title.alternative | 입체 규칙성 고분자의 희석 용액 성질 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 60870/325007 | - |
dc.description.department | 한국과학기술원 : 화학과, | - |
dc.identifier.uid | 000795231 | - |
dc.contributor.localauthor | Jhon, Mu-Shik | - |
dc.contributor.localauthor | 전무식 | - |
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