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

The 13C spin-lattice relaxation time T1c, the spin–spin relaxation time T2c, 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 13C NMR and the thickness of interfacial region has been obtained. Also, a model of chain folding in the interphase region is proposed and compared with Floryʹs calculations; consequently, the applicable extent of the theory is examined.