End Group Effects on Monolayer of Functionally-Terminated Poly(Dimethylsiloxanes)at the Air-Water Interface

摘要

The formation of Langmuir monolayers from poly(dimethylsiloxane) oligomers(molecular weights of 900-4000) terminated with methyl, hydroxyl, epoxide, carboxyl, and amine groups is described. The isotherms (except for oligomers with molecular weights below 1500) show the characteristic transitions commonly observed for methyl-terminated PDMS. In addition, the functionally-terminated materials show a transition associated with orientation of the PDMS chains normal to the surface to form a close-packed monolayer. jg.