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Synthesis of Poly(vinyl pivalate) and Its Block Copolymers by Cobalt-Mediated Radical Polymerization  

Jeon, Hyun-Jeong (Department of Advanced Fiber Engineering, Division of Nano-Systems, Inha University)
Park, Mi-Seon (Department of Advanced Fiber Engineering, Division of Nano-Systems, Inha University)
Park, Dong-Min (Department of Advanced Fiber Engineering, Division of Nano-Systems, Inha University)
You, Young-Chang (Department of Advanced Fiber Engineering, Division of Nano-Systems, Inha University)
Youk, Ji-Ho (Department of Advanced Fiber Engineering, Division of Nano-Systems, Inha University)
Publication Information
Textile Science and Engineering / v.45, no.6, 2008 , pp. 346-352 More about this Journal
Abstract
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.
Keywords
cobalt-mediated radical polymerization(CMRP); poly(vinyl pivalate); block copolymer; poly(vinyl acetate); poly(vinyl acrylonitrile);
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