Molecular motion in polyethylene, IV

摘要: Abstract The proton magnetic resonance spin-lattice and spin-spin relaxation times T 1 2 , have been measured for various polyethylenes as a function of temperature. Transient methods were employed. data are discussed in terms methyl group rotations, corresponding to -minima below −100°C, liquid-like molecular motions, associated with minima near −30°C. importance spin diffusion is emphasized.