Multiple-Pulse Nuclear Magnetic Resonance Experiments on Some Crystalline Polymers

摘要: The difficulties of wide line NMR or conventional pulsed techniques for the analysis heterogeneous polymer systems are discussed from view point principles wide-line and system recovery time NMR. They clarified in case a simple two-phase model, distinguishability two phases both is calculated. In order to overcome these applicability multiple-pulse studied i.e., solid echo T2 (spin–spin relaxation time) train T1ρ* (spin–lattice rotating frame). Solid applied Nylon 6, low-density high-density polyethylenes. There obtained T2, fraction crystalline, intermediate amorphous polyethylene, temperature dependence three between −120°C 100°C obtained.