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상전환 공정 이중구조막의 형상에 있어 침지용 비용매가 미치는 영향
이근우,서범경,임난주,한명진 한국공업화학회 2003 응용화학 Vol.7 No.1
Polusulfone scintillation proximity membranes of a double-layered structure wereprerared with Cerium Activated Yttrium Silicate (CAYS) impregnated in a membranestructure. Using the prepared membranes, the radioactivity of an area contamintedby radionuclids can be monitored without any scintillation cocktail The membranewere fromed through two separate casting and coagulation processes. The transparentand dense support layer was obtained by solidifying a polysulfone-methylene chloridebinary solution through vacuum. CAYS-dispersed polymer solutions were cast over the top of solidified, transparent polymer films and coagulated by immersing into acoagulation bath, containing either water or isopropanol. The prepared membranesconsist of double layers. The bottom laver is a dense. pure polymer film. and thetop works as an active layer to detect a radioactive contamination .The membrane structures are significantly different depending on the nonsolvent type.
Preparation of a Polysulfone Composite for Alpha Radiation Detection
LEE, Kune Woo,SEO, Bum Kyoung,HAN, Myeong Jin Atomic Energy Society of Japan 2010 Journal of nuclear science and technology Vol.47 No.1
<P>A polymer composite for alpha radiation detection was prepared by coating a ZnS(Ag) scintillator over a polysulfone (PSF) base layer. The base layer and active ZnS(Ag) layer were formed by the evaporation of a solvent from the solution films of a binary solution of PSF and methylene chloride (MC), and a ternary scintillator paste of PSF, ZnS(Ag), and dimethylformamide (DMF), respectively. Since the scintillator paste was screen-printed without any extra binder on the surface of a solidified base layer, PSF works as a transparent and mechanical support layer as well as a binder for ZnS(Ag) coating, while maintaining the monolithic feature of the composite. The prepared composite was pliable and flexible enough to be rolled up like paper. The alpha detection of the composite was efficient enough to determine the activity of alpha radiation.</P>
Lee, Kune-Woo,Seo, Bum-Kyoung,Lim, Nan-Ju,Nam, Suk-Tae,Han, Myeong-Jin Wiley Subscription Services, Inc., A Wiley Company 2006 Journal of applied polymer science Vol.99 No.4
<P>Single- or double-layered porous films consisting of polysulfone (PSF) and cerium-activated yttrium silicate (CAYS) were prepared through the phase inversion of polymeric solutions. For a single-layered structure, a casting solution including n-methylpyrrolidone (NMP) as a solvent was cast on a glass substrate and solidified by immersing into a nonsolvent bath. In a double-layered structure, the bottom layer is a dense PSF film, prepared by vacuum coagulation of a methylene chloride/PSF solution. The top layer was formulated by coagulating the NMP solution, cast over the dense film, in a nonsolvent bath. The morphology and the radionuclide detection efficiency of the prepared films were significantly affected by the nonsolvent coagulants used. The water-coagulated, double-layered film showed a relatively clear-cut interface between the two layers, indicating the rapid coagulation of the second layer. On the contrary, the film coagulated by isopropanol retained well-developed sponge structures highly intertwined in the interface, associated with the delayed precipitation of the second layer. When spotted on the prepared films, radionuclides stayed mainly on the top surface of the isopropanol-coagulated film, but went deep into the substructure of the film coagulated with water. In comparison with the mono-layered films, the double-layered ones improved the detection capacity of the spotted radionuclides, owing to the dense support layer. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99:1903–1909, 2006</P>