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.