Synthesis and characterization of silicone modified polyurethane surfactant useable at high temperature

摘要

A series of novel silicone modified polyurethane (Si-PU) surfactants were successfully synthesized by using hydroxypropyl-terminated polydimethylsiloxane (HPMS), polyethylene glycol (PEG), dimethylolpropionic acid (DMPA) and isophoronediisocyanate (IPDI). The chemical structure of the surfactant was confirmed by FTIR and ~1H-NMR. TEM photographs showed that the micelles of the Si-PU surfactants dispersed in aqueous solution were spherical with the particle size in the range of 100-400 nm. Surface tension measurements indicated that these surfactants had low surface tension to 29.9 mN·m~(-1)and a definite critical micelle concentration to, approximately 5.0×10~(-4)-7.5×10 ~(-4)mol·L~(-1). When the content of HPMS was 20 wt%, the surfactant's, emulsifying performance was superior to the traditionally available Span80/Tween80 mixed emulsifiers. In addition to that, no phase transition temperature was detected from 20°C to 90°C by fluorescence probe and DSC measurements, confirming the high thermal stability of the micelles.