NMR molecular dynamic study of high crystalline polymers

Analysis of the dynamic behaviour of two highly crystalline polymers, polye thylene (HDPE) and polypropylene (iPP) was carried out by solution and soli d state nuclear magnetic resonance (NMR) to obtain the response of the beha viour of both polymers with respect to the molecular chain dynamics, the ch ain ordination and the molecular packing. The proton spin-lattice relaxatio n time in the rotating frame (T(1)(H)rho) showed that HDPE is more rigid th an iPP, because the chain orientation and the molecular packing are differe nt. T(1)(H)rho parameter also depends on the molecular chain dynamics, as a result of the different sequence distribution in the domains (C) 2000 Else vier Science Ltd. All rights reserved.