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Poly(ethylene oxide-b-acrylonitrile) (PEO-b-PAN) block copolymers were prepared as precursors to mesoporous carbons. Redox-initiated radical polymerization and controlled radical polymerization techniques, such as reversible addition-fragmentation chain transfer (RAFT) and activators regenerated by electron transfer atom-transfer radical polymerization (ARGET ATRP), were successfully applied to prepare PEO-b-PAN block copolymers with high PAN content. Radical polymerization of acrylonitrile (AN) using ceric ion as redox initiator gave block copolymers with PEO:PAN ratio of up to 1:38.4, but their high molecular weight and polydispersity index (PDI) indicated that the structure was not controlled. Therefore, in order to achieve better control on the structure of the PAN block, controlled radical polymerization techniques were used. Poly(ethylene oxide) with trithiocarbonate (PEO-CTA) and bromide (PEO-Br) end groups were synthesized as polymeric chain transfer agent for the RAFT process and as initiator for the ATRP process, respectively. The RAFT process of AN using PEO-CTA gave block copolymers with PAN block length 0.53-3.58 times that of the PEO block. Moreover, ARGET ATRP allowed to prepare block copolymers with a very high molecular weight of 72,000, while maintaining a PDI value as low as 1.20.
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참고문헌 (25)
참고문헌 신청
D. llardice. / 2000 / The Utilisation of Low Rank Coals / Austr. Coal. Rev :40~46
M. Kruk. / 2006 / Well-Defined Poly(ethylene oxide)-Polyacrylonitrile Diblock Copolymers as Templates for Mesoporous Silicas and Precursors for Mesoporous Carbons / Chem. Mater 18:1417~1424
T. Ozturk. / 2007 / Synthesis of Block Copolymers via Redox Polymerization Process : A Critical Review / Iran Polym. J 16:561~581
K. K. Lee. / 1998 / The Synthesis and Thermal Phase Transition Behavior of Poly(N-isopropylacrylamide)-bpoly(ethylene oxide) / Polym. Bull 40:455~460
C. Q. Wang. / 2003 / Characterization and Properties of Amphiphilic Block Polymer Based on Poly(ethylene oxide)and Poly(butyl acrylate) / J. Appl. Polym. Sci 89:3432~3436
M. Kruk. / 2006 / Well-Defined Poly(ethylene oxide)-Polyacrylonitrile Diblock Copolymers as Templates for Mesoporous Silicas and Precursors for Mesoporous Carbons / Chem. Mater 18:1417~1424
T. Ozturk. / 2007 / Synthesis of Block Copolymers via Redox Polymerization Process : A Critical Review / Iran Polym. J 16:561~581
K. K. Lee. / 1998 / The Synthesis and Thermal Phase Transition Behavior of Poly(N-isopropylacrylamide)-bpoly(ethylene oxide) / Polym. Bull 40:455~460
C. Q. Wang. / 2003 / Characterization and Properties of Amphiphilic Block Polymer Based on Poly(ethylene oxide)and Poly(butyl acrylate) / J. Appl. Polym. Sci 89:3432~3436
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