Fluorinated siloxane amine oligomers

Fluorine-containing siloxane oligomers were made from bis(aminopropyl)tetra methyldisiloxane and trimethyltris(trifluoropropyl)cyclotrisiloxane. These materials were characterized by IR spectroscopy, size exclusion chromatogra phy, nonaqueous colorimetric end group titration, and H-1-NMR. The end grou ps of one oligomer were chemically modified for an increased NMR signal for molecular weight determination. The cyclic trimeric siloxane starting mate rial was additionally studied via C-13-, Si-29, and F-19-NMR. Two forms of it were used: a white solid obtained at room temperature, and a colorless l iquid isolated at low temperature. (C) 2000 John Wiley & Sons, Inc.