Abstract
Controlled radical copolymerization of chlorotrifluoroethylene (CTFE) and vinyl acetate (VAc) was successfully achieved in the presence of bis(acetylacetonato)cobalt(II) (Co(acac)2) as a mediated agent and 2,2′-azo-bis-isobutyronitrile (AIBN) as initiator. Both the molar mass and the fluorinated unit content of the copolymer could be controlled, and the chain extension polymerization of the obtained fluorinated copolymer was also achieved.
Highlights
Fluorinated polymers usually exhibit many remarkable properties due to the high electronegativity of the fluorine atom and the strong dissociation energy of the C-F bond (485 kJ·mol−1 ) [1,2,3,4,5]
Some of the controlled radical polymerization (CRP) methods have been used in thepolymerization of fluoroolefins, such as vinylidene fluoride (VDF), chlorotrifluoroethylene (CTFE), 3,3,3-trifluoropropene (TFP), and hexafluoropropylene (HFP)
We successfully conducted the radical copolymerization of CTFE and vinyl acetate (VAc) in the presence of
Summary
Fluorinated polymers usually exhibit many remarkable properties due to the high electronegativity of the fluorine atom and the strong dissociation energy of the C-F bond (485 kJ·mol−1 ) [1,2,3,4,5]. Ameduri et al reported the synthesis of poly(VDF-co-TFP)-b-oligo(vinyl acetate) via the RAFT/MADIX process with fluorinated xanthate as a mediated agent [14]. Later on, another similar copolymerization process of perfluoro(methyl vinyl ether) and VDF was presented by Girard et al [9]. In 2011, Liu et al achieved the living/controlled radical copolymerization of CTFE and butyl vinyl ether (BVE) at room temperature under 60 Co γ-ray irradiation with an O-ethyl xanthate [11]. Later in 2014, living/controlled radical copolymerization of CTFE and N-vinylpyrrolidone under 60 Co γ-ray irradiation with S-benzyl O-ethyl dithiocarbonate as the RAFT/MADIX agent at room temperature was reported [6]. Ameduri et al reported another case in [35], where an organometallically mediated radical polymerization of VDF with an organocobalt compound
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