Abstract
The longitudinal (spin-lattice) relaxation times of Т1 of protons are measured selectively (for various structural groups) at a nuclear magnetic resonance frequency of 700 MHz in a solution of an industrial sample of Cariflex-IR0307 isoprene rubber in deuterated benzene. It is shown that the value of T1 significantly
 depends on the structural position in the polyisoprene chain. The highest values of T1 are obtained at double bonds of monomer units in the cis-configuration and the methyl group of the trans-unit, the smallest values were obtained for the methine and methylene protons of the 3,4-unit, with a difference of two to three times. The questions of measurement accuracy are considered. Practical recommendations are formulated for the conditions of recording high-resolution NMR1H spectra at quantitative analysis of the structure of isoprene rubbers.
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