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• W2028127373 abstract "The basis of 1H and 13C high-resolution n.m.r. investigations of solid polymers is outlined. The 13C n.m.r. spectra of solid syndiotactic and isotactic polypropene (polypropylene) are discussed and their interpretation in terms of conformation and chain-packing effects are reviewed. The effects of decreasing temperature on the 13C high-resolution spectrum of an annealed sample of isotactic polypropene is described and interpreted in terms of the crystal structure. The question of the proportion of the sample giving rise to 13C signals is addressed and some results reported. The main cause for observing only part of the total sample is shown to be the 1H rotating frame spin-lattice relaxation behaviour. The 1H spin-lattice relaxation and spectral characteristics of a number of polyolefine samples are summarized and the role of spin-diffusion discussed. The heterogeneity revealed by the multicomponent T1ϱθ behaviour has been modelled numerically using a computer and the conclusions are outlined. The recovery behaviour of polybut-l-ene, following conversion to a meta-stable form by heating, is observed using both cross-polarization and single-pulse excitation techniques. In addition, an example of the investigation of a propene/ethylene copolymer by both 13C and 1H methods is described to illustrate the interdependence of the techniques." @default.
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• W2028127373 date "1985-02-01" @default.
• W2028127373 modified "2023-09-26" @default.
• W2028127373 title "13C and 1H n.m.r. studies of solid polyolefines" @default.
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• W2028127373 doi "https://doi.org/10.1016/0032-3861(85)90026-6" @default.
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