Complex Amphiphilic Hyperbranched Fluoropolymers by Atom Transfer Radical Self-Condensing Vinyl (Co)polymerization

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• 作者：Kenya T. Powell ; Chong Cheng ; Karen L. Wooley
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：June 26, 2007
• 年：2007
• 卷：40
• 期：13
• 页码：4509 - 4515
• 全文大小：129K
• 年卷期：v.40,no.13(June 26, 2007)
• ISSN：1520-5835

文摘

Amphiphilic hyperbranched fluorohomopolymer (M<SUB>n = 9.06 kDa, M_w/M_n = 1.90) and fluorocopolymer (M_n = 17.2 kDa, M_w/M_n = 2.50) with tri(ethylene glycol) units incorporated at the molecular level weresynthesized by atom transfer radical self-condensing vinyl homopolymerization of an inimer, 4-[oxy(tri(ethyleneglycol))bromoisobutyryl]-2,3,5,6-tetrafluorostyrene, and copolymerization of the inimer with 2,3,4,5,6-pentafluorostyrene (1:3, inimer:monomer), using 2,2'-bipyridine together with CuCl/CuCl₂ as the ligand/catalyst/deactivatorsystem. The structure and composition of the fluoropolymers were characterized by ¹H, ¹³C, and ¹⁹F NMRspectroscopies. As detected by thermogravimetric analyses, the homopolymer and the copolymer had thermalstability up to 175 and 210 s/entities/deg.gif">C, respectively. Differential scanning calorimetry revealed a glass transition temperatureof -19 s/entities/deg.gif">C for the homopolymer and 20 s/entities/deg.gif">C for the copolymer. Solubility tests indicated that both polymers weresoluble in a broad range of organic solvents, and the presence of tri(ethylene glycol) units resulted in the formationof water-dispersible micelles from each of the polymers.