Research Of Core-shell Structure Fluorinated Polyacrylate Gradient Blending

Fluorinated polyacrylate with outstanding surface properties, chemical resistance and stability has been applied to lots of field. But the high price of fluoride monomer hinders the wide application to some extent. This paper designed and prepared core-shell structure fluorinated polyacrylate and non-fluorinated polyacrylate, then blended the fluorinated and non-fluorinated polyacrylate latex with self-organization process to get the polymer gradient blending materials which contains the performance of each component, owns the gradient structure and performance without bad interface, reduces the content of fluoride monomers to save the cost at the same time. The structures and properties of polymer latexes and polymer blending films were studied.Based on semi-continuous seed emulsion polymerization method, the core-shell fluorinated polyacrylate latexes with different hexafluorobutyl methacrylate(F6MBA) content(4%, 8%, 15%, 30%, 50%) in the shell while methyl methacrylate(MMA) and butyl acrylate(BA) in the core were synthesized. Non-fluorinated polyacrylate latexes(PMMA-co-BA) were prepared also. The particle size and stability were characterized by dynamic light scattering, the composition of polymer was analyzed by infrared spectroscopy, and the core-shell structure of fluorinated polyacrylate was characterized by transmission electron microscope.The fluorinated latex and non-fluorinated polyacrylate latex were mixed together respectively. The structure and performance of the blending films were characterized by static contact angle, infrared spectroscopy, raman spectroscopy and scanning electron microscope. The result shows that interface energy of film and air(F-A) are reduced following the increase of fluorine content and heat treatment at 120?, and reduced more obviously over the anneal time. When the content of fluorine was 16.7%, the interface energy of blending film could reduce to 18.75mN/m, which was similar to pure fluorinated acrylate homopolymer. The gradient structure in the section of blending film was also confirmed.To discuss the position and structure effects of fluorinated components in polymer latex particles on the properties of the blending films, three kinds of fluorinated polyacrylate latexes were synthesized: the core-shells structure with fluorine in the shell only, the core-shells structure with fluorine in the core only, fluorinated random copolymer of F6 MBA, MMA and BA. The non-fluorinated polyacrylate latexes(PMMA-co-BA) were also prepared. The performance of latex was characterized by dynamic light scattering and transmission electron microscope. Then the three kinds of fluorinated polyacrylate and PMMA-co-BA were mixed respectively to get the blending films. Annealed the films at 120? and 185?. The structure and property of blending films were analyzed by static contact angle, infrared spectroscopy, atomic force microscope and scanning electron microscope. The results showed that blending film with fluorinated polyacrylate component of fluorinated shell had better interface property and gradient structure. The morphology of the blending film with fluorinated polyacrylate component of fluorinated shell was also characterized.