有机硅改性聚氨酯的合成及其表面性能

Synthesis and Surface Properties of Dihydroxybutyl Terminated-Polydimethylsiloxane Modified Polyurethane

以2,4-甲苯二异氰酸酯、二端羟丁基聚二甲基硅氧烷(DHPDMS)、聚四氢呋喃醚二醇、1,4-丁二醇为主要原料合成了系列的有机硅改性聚氨酯(Si-PU)。红外光谱测试表明DHPDMS已被化学键入聚氨酯分子链中。随DHPDMS含量升高,Si-PU接触角增大,表面张力减小;DHPDMS含量超过5%时,二者渐趋于恒定。随温度升高,Si-PU接触角增大;超过50℃后,接触角渐趋于恒定。DHPDMS含量越高,接触角趋于恒定时的温度越低。研究表明,DHPDMS含量为5%时,Si-PU具有较好的表面与力学性能。

A series of siloxane-modified polyurethanes （Si-PU） were synthesized based on 2,4- tolylene diisocyanate （TDI）, dihydroxybutyl-terminated polydimethylsiloxane （DHPDMS）, poly （tetramethylene ether） glycol （PTMG） and 1,4-butanediol （BDO）. Fourier transform infrared spectroscopy （FT-IR） analysis shows that DHPDMS has been incorporated into the polyurethane chains. With increasing the content of DHPDMS, the water contact angle increases while the surface tensile force decreases. When the content of DHPDMS is over 5%, both the uater contact angle and the suface tensile force tend to a constant. With increasing temperature, the contact angle increases, and also tends to a constant when temperature is higher than 50℃. The results indicate that Si-PU reaches good surface and mechanical properties when the content of DHPDMS is about 5 %.