Longitudinal (spin-lattice) relaxation times T1 of protons are measured selectively (for various structural groups) at NMR frequency 700 MHz in a deuterated benzene solution of Cariflex-IR0307 industrial isoprene rubber. It is shown that the T1 value depends significantly on the structural position in the polyisoprene chain. The highest T1 values are obtained for monomer units with cis-double bonds and the methyl group of trans-units. The smallest T1 values are obtained for methine and methylene protons of 3,4-units with a difference of 2–3 times. Questions of the measurement accuracy are considered. Practical recommendations are formulated for the recording conditions of high-resolution PMR spectra during quantitative analysis of the structure of isoprene rubbers.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 89, No. 6, pp. 824–829, November–December, 2022. https://doi.org/10.47612/0514-7506-2022-89-6-824-829
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Makhiyanova, N., Efimov, S.V. Longitudinal Relaxation of Nuclear Magnetization in Rubber Solutions: Polyisoprene Protons. J Appl Spectrosc 89, 1080–1084 (2023). https://doi.org/10.1007/s10812-023-01470-5
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DOI: https://doi.org/10.1007/s10812-023-01470-5