Synthesis and Characterization of Short-Chain Fluorinated Acrylate Emulsion with Core-Shell Structure

The synthesis and characterization of an emulsion of core-shell structure and containing short-chain fluorinated acrylate were studied in this paper. A series of emulsions of core-shell structure and containing fluorinated acrylate copolymer in shell was synthesized via a multi-step seed emulsion polymerization,and meanwhile,by using the copolymer of methyl meth acrylate( MMA) with butyl acrylate( BA) as the core and the copolymer of 2-( perfluorinated hexyl) ethyl methacrylate( FMA6)with acrylate linking n-alkyl chain of various length( n = 4,8,12,16 and 18,respectively) as the shell.The effects of both the content of the fluorinated monomers and the length of n-alkyl chain of acrylate in the shell on oil and waterproof performance were especially investigated,based on a systematical optimization of process conditions. The obtained products were then characterized and analyzed. The results show that the emulsion with w( FMA6) = 8. 5% and methyl hexadecyl methacrylate rich in shell could make the latex film possess the best hydrophobic and oleophobic performance. The contact angle of the film with water was 124. 67° and methylene diiodide was 112. 76°. The characterization results of FTIR,TEM and DSC /TGA indicate that the prepared emulsion containing fluorinated acrylate copolymers showed the typical core-shell structure. The synthesized polymer emulsion has two glass transition temperatures( Tg1=- 18. 87 ℃ and Tg2= 32. 08 ℃),indicating that their decompositiontemperature increased by 20 ℃. Thereout,the latex film made by short-chain fluorinated acrylate emulsion displayed excellent lyophobic and oleophobic performance and thermal stability.