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• W2036700000 abstract "1H and 13C-n.m.r. spectra and spin-lattice relaxation behaviour (laboratory frame, T1 (13C and 1H), and rotating frame, T1ρ (1H)) are reported for a range of solid ethylene copolymers with α-olefins having different types and concentrations of branches. The spin-diffusion model for relaxation in semicrystalline polymers is summarised and some new theoretical results given. The 13C high-resolution n.m.r. spectra obtained using both cross-polarisation (c.p.) and single pulse excitation (s.p.e.) methods associate side chain resonances mainly with the mobile, short T1ρ protons and, hence, the more disordered region of the solids, consistent with the short 13C T1 components. 1H laboratory-frame spin-lattice relaxation is single component whilst those for 13C and the 1H on-resonance rotating-frame relaxation are both multiexponential processes, requiring a minimum of three components to describe them. Annealing of samples, which is known to increase the lamellar thicknesses of the crystalline region, causes large increases in the longer relaxation time components. The 1H and 13C spin-lattice relaxation data for a set of annealed and quenched ethyl-branched materials having different branch contents are compared in detail with the predictions of the spin-diffusion relaxation model. The results are internally and semi-quantitatively consistent with this theory and it is concluded that for the 1H spin-lattice relaxation the model is clearly appropriate and for 13C it is consistent with observations. Questions concerning the relevance of spin-diffusion for the magnetically dilute 13C nucleus at natural abundance are mentioned and possible alternative explanations for the relationships observed are referred to briefly." @default.
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• W2036700000 date "1987-03-01" @default.
• W2036700000 modified "2023-10-16" @default.
• W2036700000 title "Nuclear magnetic resonance in solid ethylene/α-olefin copolymers: Relaxation, spin-diffusion and lamellar widths" @default.
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• W2036700000 doi "https://doi.org/10.1002/pi.4980190208" @default.
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