Abstract
In the presence of mercaptoethanol as chain-transfer agent,hydroxyl-terminated polyacrylate(PA) with a certain molecular mass was synthesized by solution free-radical polymerization of butyl acrylate( BA) and methyl methacrylate ( MMA ). The PA-PU-PA hybrid emulsion was obtained by reacting PA with polyurethane(PU) prepolymer in water. FTIR and 1H NMR results of the copolymer chain structure show that when PU /PA mass ratio declined,the acrylic content in the copolymer increased and the role of hydrogen bonds between PU soft and hard segment weakened. The composite particles had homogeneous core-shell structure in TEM photograph. Waterproof and heat resistant performance of the modified latex film were improved with the decrease of PU /PA mass ratio. Water absorption of the modified film dropped from 25% to 5% and the maximum mass loss temperature was increased from 369 ℃ to 432 ℃ .
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