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Citation: DHEN Jing-Jing, ZHU Chuan-Fang, QIN Zheng-Ni, BAI Yi-Qiong. Effect of Nano-silica Content on Properties of Waterborne Polyurethane Composites[J]. Chinese Journal of Applied Chemistry, ;2008, 25(9): 1047-1051. shu

Effect of Nano-silica Content on Properties of Waterborne Polyurethane Composites

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

Corresponding author: ZHU Chuan-Fang,
Received Date: 20 August 2007
Available Online: 20 November 2007
Fund Project: 湖北省科技厅资助项目(2007AA101C35) (2007AA101C35)

We have prepared waterborne polyurethane(WPU) nano-SiO₂ composites by in situ polymerization,during which modified silica sol was first mixed with the N-methyl-pyrolidone(NMP),and then polyme-rization was carried out with the addition of isophorone diiocyanate(IPDI),polycaprolactone(PCL) dimethylol-propionic acid(DMPA) and dibutyltin dilaurate.Effects of nano-silica content on the thermal and mechanical properties of WPU/nano-silica composites were investigated by thermogravimetric analysis(TGA),differential scanning calorimetry(DSC),transmittance electron microscopy(TEM) and dynamic mechanical analysis(DMA).The experiment results show that the nano-silica particles were well dispersed in the WBPU solution when the silica content was lower than 3.0%,a wider T_g gap and higher microphase separation degree between soft and hard segment were observed for WPUNS,and the thermal degradation temperature of the composite was higher than that of a pure WPU at temperature over 50 ℃.Besides,as the nano-silica content was increased from 0 to 0.5%,the elongation at break and water swell were decreased from 550% to 430% and 16.8% to 4.5%,respectively,while,the tensile strength was increased from 3.4 MPa to 5.95 MPa.As the nano-silica content was increased to 2.5%,the elongation at break and water swell decreased to 210% and 2.3%,and the tensile strength increased to 7.58 MPa.
- nanosilica,
- waterborne polyurethane,
- modify,
- morphology,
- property
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