The authors discuss the synthesis of aminopropyl-terminated polysiloxane oligomers via ring-opening equilibration reactions and the subsequent supercritical fluid extraction of these oligomers into narrow molecular weight distribution fractions. Fractionation of alpha , omega - carboxypropyl terminated polydimethylsiloxane oligomers using supercritical carbon dioxide was previously reported from our laboratories. This study uses supercritical ethane to fractionate alpha , omega -aminopropyl functional oligomers of varying composition. The molecular weights ranged from 2,000 to 20,000 Mn, while the backbone composition was varied from all dimethyl to various amounts of diphenyl and trifluoropropylmethyl. The parent oligomer and the resulting fractions were characterized by titration as well as by gel permeation, liquid, and gas chromatography.
|Number of pages||2|
|Journal||American Chemical Society, Polymer Preprints, Division of Polymer Chemistry|
|State||Published - Aug 1987|
|Event||Polym Prepr -Pap Presented at the New Orleans, LA Meet - New Orleans, LA, USA|
Duration: Aug 30 1987 → Sep 4 1987