An Na Kim, Pittsburg State University, Pittsburg, KS, William M. Shirley, Pittsburg State University, Pittsburg, KS, and Zoran S. Petrovic, Pittsburg State University, Pittsburg, KS.
Solid-state 13C NMR spectroscopy was used to investigate polyurethanes consisting of soy-polyol, 4,4-diphenylmethane diisocyanate (MDI), and 1,2-ethylene glycol (EG) or 1,4-butanediol (BD) as a chain extender. MDI/EG and MDI/BD regions are considered as the hard segments of polyurethanes and the region of MDI/soy-polyol is the soft segment. Cross-polarization/magic angle spinning (CP/MAS) 13C NMR spectra of five polyurethane samples with different % soft segment concentrations were obtained. 13C spin-lattice relaxation time (T1) measurements were also carried out for these five samples. Carbons have T1 values in the range from 0.2 sec to 23.6 sec, indicating that the predominant phases are interfacial and rubbery. None of the T1 values obtained were long enough to show noticeable crystallinity in the five polyurethane samples.
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