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Citation: CHEN Wei, LI Hao, ZHANG Yan, XU Ge-Wen, HUANG Yi-Ping. Waterborne Polyurethane Modified by Hydroxyl-Terminated Polyacrylate[J]. Chinese Journal of Applied Chemistry, ;2010, 27(8): 875-881. doi: 10.3724/SP.J.1095.2010.90652 shu

Waterborne Polyurethane Modified by Hydroxyl-Terminated Polyacrylate

School of Chemistry and Engineering, Key Laboratory of Environment-friendly Polymer Materials of Anhui Province, Anhui University, Hefei 230039

Received Date: 9 October 2009
Revised Date: 7 January 2010

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℃.
- polyacrylate,
- aqueous polyurethane,
- modified,
- multi-block copolymer
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