Thermoresponsive Amphiphilic Star Block Copolymer Photosensitizer: Smart BTEX Remover

Title
Thermoresponsive Amphiphilic Star Block Copolymer Photosensitizer: Smart BTEX Remover
Authors
조계룡김지은윤호규황승상백경열
Issue Date
2013-10
Publisher
2013년 추계 고분자학회
Abstract
Thermosensitive well-defined amphiphilic star block copolymer photosensitizers were synthesized by sequential block copolymerization of styrene and N-isopropyl acrylamide from a photocatalyicporphyrin core through reversible addition fragmentation transfer (RAFT) process. Obtained star block copolymers were applied for water purification system, which removed the environmentally toxic organic materials such as benzene, toluene, ethylbenzene, and xylene (BTEX) in water, following the procedure that absorbed BTEX near to the porphyrin core by effective hydrophobic interaction and then decomposed them under UV irradiation by activated singlet oxygen generated from the porphyrin core. For comparison, the combination of star block copolymer with UV irradiation effectively decomposed BTEX approximately over 95% except for Toluene, which relatively high performance comparing to other combinations such as only UV, only star block copolymer, and star block copolymer with visible light source. Furthermore, the function of dehydration of PNiPAM outer layer led easy to recycle star block copolymers by a simple filtration after thermal treatment. The processes of absorption and decomposition were monitored by HPLC with gas-tight technics, and low critical solution temperature (LCST) function by dehydration of the PNiPAM layer was observed by measuring UV-Vis. spectroscopy. Finally, the polymer stability was confirmed by measuring the 1H NMR of star block copolymer after photo-oxidation reaction. Thermosensitive well-defined amphiphilic star block copolymer photosensitizers were synthesized by sequential block copolymerization of styrene and N-isopropyl acrylamide from a photocatalyicporphyrin core through RAFT process. Obtained starpolymers were applied for water purification system, which removed the toxic organic materials such as benzene,toluene,ethylbenzene,xylene (BTEX) in water, following the procedure that absorbed
URI
http://pubs.kist.re.kr/handle/201004/46739
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KIST Publication > Conference Paper
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