화학공학소재연구정보센터
학회 한국고분자학회
학술대회 2004년 봄 (04/09 ~ 04/10, 고려대학교)
권호 29권 1호, p.279
발표분야 고분자 가공/블렌드
제목 Vapor exposure effect of a casting solution on the embedding and radioactive detection of inorganic fluor in composites
초록 Polymer composites to assay the radioactive contamination were prepared using polysulfone (PSF) and cerium activated yttrium silicate (CAYS), consisting of a dense support layer and a top layer holding CAYS. The active top layer in the film was obtained by the coagulation of a casting solution via the diffusion-induced phase inversion. As coagulated through direct immersion into a water bath without vapor exposure, the CAYS-holding layer showed a typical asymmetric structure with large macropores. The inorganic fluor, CAYS, was embedded in the matrix by being transfixed into a polymer network. With the increase in vapor exposure time before immersion in a water bath, morphology of the films transformed from asymmetric to sponge-like structures, revealing more developed cellular structure. CAYS, which is separated from the polymer network, was found in the nucleated polymer-lean phase. The border structure between the two layers epitomized the phase inversion rate of a cast solution, revealing the ingredients’ movement during the structure formation. As for the film prepared by direct immersion in a water bath, a clear-cut structure on the border supports the rapid transition of the cast solution into a solid state. On the contrary, the ambiguous interface feature on the films prepared by involving vapor exposure revealed the delayed phase transition with the corresponding sponge-like structure. The polymer phase in a sponge-like structure is so dense that the deposited radionyclides could not pass the phase, consequently coming to the loss in the detection efficiency.
저자 한명진, 남석태
소속 경일대
키워드 polysulfone; radionuclide; polymer film; fluor
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