Abstract
A 13C n.m.r. study of a series of polyurethanes and selected model compounds is reported. Comparison of the observed chemical shifts with values predicted by the Grant and Paul additive theory shows reasonable agreement. The latter approach, therefore, is a useful method for the assignment of carbon resonances in these systems. The positions of carbonyl peaks are more difficult to predict, but model compound studies allow their unambiguous assignment. These peak positions are very useful for qualitative and quantitative measurements. Nuclear Overhauser Enhancement (NOE) factors have been measured for typical copolymers, and it is possible to obtain quantitative estimates of the compositions of unknown polymers and prepolymers.
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