Abstract
Emulsifier-free copolymerizations of 2,2,2-trifluoroethyl 2-methylpropanoate (TFMPA) and methyl acrylate in the presence of surface-active commoner, undecylenic acid (UA), were carried out using potassium persulfate (KPS) as initiator. The prepared copolymer emulsions were characterized and analyzed by FT-IR, 1H and 19F NMR spectra, TEM, dynamic light scattering (DLS), and contact angle testing. The results showed that the average particle size of copolymer latex particles was 200-300 nm with a relatively uniform particle size distribution. The glass transition temperature was controlled with the monomer feed ratios. After copolymer emulsions coating on the concrete surface, the contact angle was significantly increased, and the water absorption of the concrete was significantly reduced.
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