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전성익,정인재,안철희 한국고분자학회 2020 Macromolecular Research Vol.28 No.2
Removal of magnesium and calcium cations in water, called water softening, is an important procedure for industrial use. Although ion exchange resin and chelate resin are one of the most widely used materials for desalination, they have a drawback in regeneration, in which huge amount of salt or strong acidic/basic aqueous solution needs to be applied. In this research, sulfonamide-derived cation capturing system was suggested as an alternative. Sulfonamide derivatives usually show a sharp transition from charged to uncharged form at a specific pH, which alleviates the condition of regeneration. A variety of sulfonamide derivatives were introduced to polystyrene microbeads. 1.88±0.05 mmol/g of the sulfonamide-based ligand was introduced in maximal amount. Cation chelating capacities of products were quantified through calcium ion capturing test, identifying several sulfonamides as promising cation capturing systems. Finally, their metal ion capturing capacities within specific pH ranges and regeneration properties in moderate acidic condition were verified. Among the surface-treated sulfonamide derivatives, glycine-conjugated sulfonamide group, which had 0.90±0.01 mmol/g of ion capturing capacity and rapidly regenerated at pH 5.0, was found to be most appropriate for water softening application.
전성익,제환준,안철희 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Drug-eluting beads (DEBs) are size-calibrated microspheres used for transarterial chemoembolization (TACE) procedures, occluding the blood supply to the hepatocellular carcinoma (HCC). Conventional DEBs have some limitations in their biodegradability or x-ray visibility, which cause operational inconvenience and risk of non-target embolization. In this research, x-ray contrast agent-incorporated polymeric microparticles (MPs) were fabricated with a double-emulsion method for the application to TACE. The size distribution of the final product was analyzed with an optical microscope. The x-ray visibility was determined with a real-time C-arm device. The size of MPs was about several hundred micrometers, and it showed narrow size distribution. MPs were determined to have enough x-ray attenuation property to be visualized with a C-arm device. In conclusion, it is confirmed that the polymeric MPs developed in this study have high potentials for the treatment of cancer.