Solid-state high-resolution C-13 NMR study on the interphase in lamellar semi-crystalline polymers

The C-13 spin-lattice relaxation time T-1c, the spin-spin relaxation time T -2c, the chemical shift values as well as mass fractions of the interphase of PE samples crystallized under various conditions were reported mainly in this work. The existence of the interphase is identified by the method of solid-state high-resolution C-13 NMR and the thickness of interfacial regio n has been obtained. Also, a model of chain folding in the interphase regio n is proposed and compared with Flory's calculations; consequently, the app licable extent of the theory is examined. (C) 2001 Elsevier Science Ltd. Al l rights reserved.