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Citation: WU Xiao-Feng, ZHU Chuan-Fang, ZHANG Li, WAN Ting. Synthesis and Properties of Waterborne Polyurethane Modified by Dihydrooxypolydimethylsiloxane[J]. Chinese Journal of Applied Chemistry, ;2007, 24(9): 1023-1026. shu

Synthesis and Properties of Waterborne Polyurethane Modified by Dihydrooxypolydimethylsiloxane

1.
Faculty of Chemistry, Central China Normal University, Wuhan 430079

Corresponding author: ZHU Chuan-Fang,
Received Date: 26 September 2006
Available Online: 29 December 2006
Fund Project: 湖北省自然科学基金(2006ABA174)资助项目 (2006ABA174)

Waterborne polyurethane(WPU) dispersion with a high solid content of about 38% and a volatile oganic compound content of about 60 g/L was prepared from isophorone diisocyanate(IPDI), dihydrooxypolydimethylsiloxane(DHPDMS), polyester-diol, dimethyloxypropionic acid(DMPA). Effects of the amount of DHPDMS, the molecular mass of DHPDMS on the appearance, viscosity, adhesion, water resistance, hardness, tensile strength, elongation of polyurethane modified by DHPDMS were discussed. IR spectrum indicates the silica-oxygen bond is introduced to the polymer and lots of hydrogen bonds are present in the polymer; DSC demonstrates two glass transition temperatures(T_g1=-28.1℃, T_g2=34.4℃) and microphase separation is present; SEM has verified the above results. The polymer was also compared with the non-modified polyurethane. The result shows that the modified resin has good performance(good mechanical properities, σ=14.48 MPa, ε=521%) when the amount of DHPDMS is 2% and molecular mass is 3 000.
- hydrooxypolydimethylsiloxane,
- waterborne polyurethane,
- synthesis,
- modify
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