Proton longitudinal NMR relaxation of poly(p-phenylene sulfide) in the laboratory and the rotating frames reference

Solid state 1H NMR study of molecular dynamics and domain sizes in PBT with the fullerene derivates: Decylamine–C60 and tetracyanoethylene oxide–C60

“…The off-resonance relaxation time T 1ρ off in the rotating frame was obtained by measuring recoveries of magnetization at the effective field B e [10,11]. The pulse sequence used in this experiment is presented in Fig.…”

Molecular dynamics of poly(ethylene 2,6-naphthalate)-polycarbonate composite by nuclear magnetic resonance

“…The measurements of the relaxation time in the rotating frame off-resonance roff --19 for a series PEN-PC without the compatibilizer and for a series PEN-PC with the compatibilizer have been performed on a homebuilt pulse spectrometer by measuring recoveries of magnetization at the effective field Bo [10]. The results of these measurements have been presented asa function of the angular frequency at temperatures of 303 and 398 K (Figs.…”

Molecular dynamics of poly(ethylene terephthalate)/poly(phenylene sulfide) nanocomposites with barium titanate

“…It was suggested that the estimated value of activation energy E A2 about 9 kJ/mol is connected with the phenyl rings reorientation around a characteristic axis in position para in crystalline phase [19]. The longest correlation times of 7 4 · 10…”

“…It was assumed that the phenyl ring jumps between two unequal states have the most influence on the spin-lattice relaxation rate below the glass transition temperature [18,19]. The contribution of phenyl flip motion to spin-lattice relaxation rate can be described by [20,21] …”