Total correlated spectroscopy polymers

M. Takasaki, K. Kimura, Y. Nakagawa, N. Sato, B. Bae, K. Miyatake, M. Watanabe, Complete NMR assignment of a stdfonated aromatic block copolymer via heter-onuclear single-quantum correlation, heteronuclear multiple-bond correlation and heteronuclear single-quantum correlation total correlation spectroscopy, Polym. J. 44 (2012) 845-849. 

Total correlation spectroscopy (TOCSY) experiments produce a complete set of cross-peaks among all nuclei in the same spin system. This can be helpful in identifying nuclei of a ring or sections of a polymer chain. F TOCSY spectra can be difficult to interpret in polymers due to overlapping resonances. Use of F- F TOCSY spectra is uncommon due to the difficulties with producing an adequate spin-lock pulse over the large F spectral window [8]. 

It is well known for example in the saturated LDPE polymer chains that a certain number of double bounds exist which can be measured with IR spectroscopy. By extraction with non-polar solvents and GC separation, numerous alkanes and alkenes can be identified which are dissolved in small concentrations in the PE. The odor thresholds of these compounds are in general so high that these hydrocarbons play no sensory role. As a result no correlation can be made between the total amount of volatile compounds isolated from PE or the fingerprint chromatogram from a GC separation and the sensory properties of a sample. The relevant sensory compounds as a rule are the (order of magnitude) less concentrated oxygenated compounds in the... 

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