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United States Department of Agriculture

Agricultural Research Service

Title: Optimizing the Acid Catalyzed Synthesis of Hyperbranched Poly(Glycerol-diacids) Oligomers

Authors
item Wyatt, Victor
item Nunez, Alberto
item Foglia, Thomas
item Marmer, William

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.

Last Modified: 10/20/2014
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