Add time:07/30/2019         Source:sciencedirect.com

Cationic fluorinated polyacrylate emulsifier-free emulsion was synthesized by ab initio RAFT emulsifier-free emulsion polymerization using fluorine-containing amphiphilic block copolymer poly (2-(dimethylamino) ethyl methacrylate)-b-poly (hexafluorobutyl acrylate) (PDMAEMA-b-PHFBA) macro-RAFT agent as a stabilizer. The influence of the amount of hexafluorobutyl methacrylate (HFBMA) on emulsion polymerization and film properties was investigated. The latex particle size and its distribution decreased as the amount of HFBMA increased from 0 wt% to 8 wt%, and then increased afterwards. The latex particles presented spherical-like particles with diameters of 44–56 nm characterized by TEM. The GPC result showed that well-controlled cationic fluorinated polyacrylate with Mw/Mn = 1.40 was obtained. In addition, XPS revealed that the fluorinated segment preferentially concentrated at the film surface after the annealing process. The water contact angle and thermal stability of the film increased with the increase of the amount of HFBMA.

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