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- W1994278318 abstract "The difficulties of wide line NMR or conventional pulsed NMR techniques for the analysis of heterogeneous polymer systems are discussed from the view point of principles of wide-line NMR and system recovery time of pulsed NMR. They are clarified in the case of a simple two-phase model, and the distinguishability of the two phases for both techniques is calculated. In order to overcome these difficulties the applicability of multiple-pulse NMR techniques are studied i.e., the applicability of solid echo for T2 (spin–spin relaxation time) and of solid echo train for T1ρ* (spin–lattice relaxation time in rotating frame). Solid echo and solid echo train techniques are applied to Nylon 6, low-density and high-density polyethylenes. There are obtained T2, T1ρ* and the fraction of the crystalline, intermediate and amorphous phases of Nylon 6, high-density and low-density polyethylenes. In the case of low-density polyethylene, the temperature dependence of T2, T1ρ* and the fraction of the three phases between −120°C to 100°C are obtained." @default.
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- W1994278318 date "1972-07-01" @default.
- W1994278318 modified "2023-09-26" @default.
- W1994278318 title "Multiple-Pulse Nuclear Magnetic Resonance Experiments on Some Crystalline Polymers" @default.
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- W1994278318 doi "https://doi.org/10.1295/polymj.3.448" @default.
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