ARS | Publication request: Optimizing the Acid Catalyzed Synthesis of Hyperbranched Poly(Glycerol-diacids) Oligomers

Submitted to: Annual Meeting and Expo of the American Oil Chemists' Society
Publication Type: Abstract Only
Publication Acceptance Date: March 26, 2007
Publication Date: May 1, 2007
Citation: Wyatt, V.T., Nunez, A., Foglia, T.A., Marmer, W.N. 2007. Optimizing the Acid Catalyzed Synthesis of Hyperbranched Poly(Glycerol-diacids) Oligomers [abstract]. Annual Meeting and Expo of the American Oil Chemists' Society. p. 100.

Technical Abstract: Oligomeric pre-polymers were synthesized by the acid-catalyzed condensation of glycerol with succinic acid, glutaric acid and azelaic acid in dimethylsulfoxide (DMSO) or dimethylformamide (DMF). The prepolymers were obtained, on average in 84% yield, and were characterized by proton NMR, MALDI-TOF mass spectrometry, and GPC. The synthesized oligomers had number-average molecular weights less than or equal to 3245 Daltons, with degrees of polymerization ranging from 3.3 to 11.5 repeat units. The oligomers had weight-average molecular weights less than or equal to 5975 Daltons with degrees of polymerizations ranging from 2.7 to 21.2 repeat units. The polydispersity was low (average = 1.26). Polymer chains were elongated when the oligomers were synthesized in dilute solutions rather than neat. Increased hyperbranching was evident when dibutyltin oxide was used as catalyst instead of titanium butoxide.