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RISS 인기검색어
- 검색키워드
- 저자 : Eui Shik Jeon ) (검색결과 3 건)
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The Nature of Water in Tactic Poly (2-Hydroxyethyl Methacrylate) Hydrogels
Kim, Eui-Hwan,Jeon, Sang-Il,Yoon, Sung-Chul,Jhon, Mu-Shik Korean Chemical Society 1981 Bulletin of the Korean Chemical Society Vol.2 No.2
The hypothesis that three classes of water exist in hydrogels, namely X water (free water-like), Z-water (bound water-like), and Y water (interfacial water-like), has been verified and generally accepted. To further check the validity of this hypothesis and to study the nature of X, Y, and Z water as conformation changes, several experiments have been done using Tactic Poly(2-hydroxyethyl methacrylate) (P-HEMA) gels. Thermal expansively data for tactic P-HEMA gel was obtained. In each case of isotactic and syndiotactic P-HEMA, the higher water content gels showed an extremely sharp volume change at $0^{\circ}C$, indicating the presence of normal free water-like. Lower water content gels showed no anomalous change in thermal expansion, indicating that the water is bound water-like. The medium water content gels exhibited intermediate behavior. These results were also confirmed by bulk gel conductivity measurments. The differential scanning calorimeter(DSC) experiment was simply introduced to further verify the bound water-like quantities which was obtained by the method of dilatometry and specific conductivity. Observing the amounts of X, Y, and Z water with the change of tacticity, the similar content of bound water-like may be due to the same primary structure of isotactic and syndiotactic polymer and the difference in free and interfacial water-like content may be due to the difference in secondary and tertiary structure of tactic polymer. Therefore, as the polymer conformation varies, the free and interfacial water-like content will be varied. In order to demonstrate these concepts, Russel et al.'s CPK space-filling molecular models of isotactic and syndiotactic P-HEMA was utilized.
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김윤식,정규영,강명숙,전의식 ( Yun Shik Kim,Gyu Young Chung,Myoung Suk Kang,Eui Shik Jeon ) 한국환경생물학회 1994 환경생물 : 환경생물학회지 Vol.12 No.2
The flora of Kari-bong (1518.5m) was investigated to compare the flora of Mt. Sorak National Park, located close by this area. The vascular plants, collected from May, 1989 to October, 1992, were consisted of a total 652 taxa; 96 families, 348 genera, 569 species, 2 subspecies, 76 varieties and 5 forms. Among them, 554 taxa (85% of total taxa) were distributed in Mt. Sorak National Park. The Korean endemic plants of this area were 37 taxa, the rare and endangered plants were 27 taxa, the special wild plants designating by Environmental Agency were 12 taxa and the alpine plants were 34 taxa. Because many plants, being necessary to conserve, are distributed, Kari-bong should be include into Mt. Sorak National Park, but if development is indespensable, destruction of natrural ecosystem must be minimized.
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