Abstract
Analysis of the dynamic behaviour of two highly crystalline polymers, polyethylene (HDPE) and polypropylene (iPP) was carried out by solution and solid state nuclear magnetic resonance (NMR) to obtain the response of the behaviour of both polymers with respect to the molecular chain dynamics, the chain ordination and the molecular packing. The proton spin-lattice relaxation time in the rotating frame (T 1 Hρ) showed that HDPE is more rigid than iPP, because the chain orientation and the molecular packing are different. T 1 Hρ parameter also depends on the molecular chain dynamics, as a result of the different sequence distribution in the domains
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