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- 주제어 : cobalt-mediated radical polymerization(CMRP) (검색결과 3 건)
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Jeon, Hyun Jeong,You, Young Chang,Youk, Ji Ho Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of polymer science Part A, Polymer chemist Vol.47 No.12
<P>An amphiphilic block copolymer of poly(N-vinyl pyrrolidone)-b-poly(ϵ-caprolactone) (PVP-b-PCL) was synthesized by a combination of cobalt-mediated radical polymerization (CMRP) and ring-opening polymerization (ROP). The micellar characteristics of this copolymer were subsequently investigated. PVP (M<SUB>n</SUB> = 11,400, M<SUB>w</SUB>/M<SUB>n</SUB> = 1.32) was synthesized at 20 °C via CMRP using a molar ratio of [VP]<SUB>0</SUB>/[V-70]<SUB>0</SUB>/[Co]<SUB>0</SUB> = 150/8/1. The PVP was then reacted with 2,2′-azobis[2-methyl-N-(2-hydroxyethyl)propionamide] (VA-086) to modify its cobalt complex chain end to a hydroxyl group. The cobalt (Co) content in the resulting PVP-OH was 1.2 ppm, indicating that all of the covalent Co&n.bond;C bonds were cleaved and reacted with VA-086, and that the separated cobalt complexes were successfully removed. The ROP of CL was subsequently carried out using the produced PVP-OH as a macroinitiator at 110 °C. The GPC trace of PVP-b-PCL was monomodal without any tailing caused by the residual PVP-OH, indicating that the initiation efficiency was very high. The critical micelle concentration (CMC) of PVP-b-PCL (M<SUB>n</SUB> = 18,000, M<SUB>w</SUB>/M<SUB>n</SUB> = 1.35) was 0.015 mg/mL. The PVP-b-PCL micelles were spherical in shape with an average diameter of 105 nm. The nanosized PVP-b-PCL micelles show promise as novel drug carriers in biomedical and pharmaceutical applications. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 3078–3085, 2009</P> <B>Graphic Abstract</B> <P>An amphiphilic block copolymer of poly(N-vinyl pyrrolidone)-b-poly(ϵ-caprolactone) (PVP-b-PCL) was synthesized by a combination of cobalt-mediated radical polymerization (CMRP) and ring-opening polymerization (ROP). The PVP-b-PCL micelles were spherical in shape with an average diameter of 105 nm. The nanosized PVP-b-PCL micelles show promise as novel drug carriers in biomedical and pharmaceutical applications. <img src='wiley_img/0887624X-2009-47-12-POLA23396-gra001.gif' alt='wiley_img/0887624X-2009-47-12-POLA23396-gra001'> </P>
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전현정,육지호,Jeon, Hyun-Jeong,Youk, Ji-Ho The Korean Fiber Society 2010 한국섬유공학회지 Vol.47 No.6
Cobalt-mediated radical polymerization (CMRP) of vinyl acetate (VAc) and acrylonitrile (AN) with poly(N-vinyl pyrrolidone) macroinitiator end-capped by cobalt(II) acetylacetonate [PVP-$Co(acac)_2$] was conducted, and the effects of the polymerization temperature and the presence of electron-donating compounds on the block copolymer synthesis were investigated. PVP-$Co(acac)_2$ is sensitive to oxygen and should be stored in an inert atmosphere. The CMRP of VAc with the PVP-$Co(acac)_2$ macroinitiator did not proceed in a controlled manner probably due to the inefficient deactivation reaction between the growing PVP-b-PVAc radicals and $Co(acac)_2$. However, well-defined PVP-b-PAN could be synthesized in dimethyl sulfoxide at $15^{\circ}C$. The well-controlled process was evidenced by the linear relationship between ln($[M]_0$/[M]) vs. time.
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코발트를 매개로 한 폴리비닐피발레이트 및 이의 블록 공중합체의 합성
전현정,박미선,박동민,유영창,육지호,Jeon, Hyun-Jeong,Park, Mi-Seon,Park, Dong-Min,You, Young-Chang,Youk, Ji-Ho 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.6
Controlled radical polymerization of vinyl pivalate (VPi) was achieved by cobalt-mediated radical polymerization (CMRP) using cobalt(II) acetylacetonate (Co$(acac)_2$) and 2,2'-azo-bis(4-methoxy-2,4-dimethylvaleronitrile) (V-70). Poly(vinyl pivalate) (PVPi) chains having controlled molecular weights and low polydispersities ($M_w/M_n$=1.05-1.29) were successfully synthesized. PVPi macroinitiator ($M_n$=11,100 g/mol, $M_w/M_n$=1.13), which was end-capped by Co$(acac)_2$ was used to successive CMRP of well-defined PVPi-b-poly(vinyl acetate) (PVPi-b-PVAc) and PVPi-b-poly(acrylonitrile) (PVPi-b-PAN) block copolymers at 30 DC. The polymerization of PVPi-b-PV Ac was performed via a degenerative chain transfer (DT) mechanism using an excess of V-70. PVPi-b-PAN was synthesized via a reversible termination (RT) mechanism in DMF.
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