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• W1996454772 abstract "The frequency dependence (‘dispersion’) of the proton spin-lattice relaxation times, T1 and T1ϱ, in the laboratory and rotating frames of reference, respectively, in melts of ‘entangled’ polymers was investigated in the range 102−108 Hz. The results can be characterized by a series of three apparently universal power laws corresponding to certain limits of polymer dynamics. The fluctuations of rotational isomerism within the Kuhn segments were independently identified in all investigated cases by the minima of the temperature dependences of T1. A theory linking the memory function formalism of polymer dynamics with the spin-lattice relaxation dispersion has been developed. On this basis, Schweizer's renormalized Rouse approach of polymer dynamics can suitably be employed for derivation of expressions reproducing two of the experimentally deduced power laws very closely. One of these frequency dependences reflects a new short-time limit of the renormalized Rouse approach not yet considered up to now. In addition, the time dependence of the mean-square segment displacements was derived for the same limits yielding a series of new power laws. The third (low-frequency) spin-lattice relaxation dispersion region has no theoretical counterpart in the frame of the renormalized Rouse theory." @default.
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• W1996454772 date "1994-09-01" @default.
• W1996454772 modified "2023-10-17" @default.
• W1996454772 title "Nuclear spin-lattice relaxation and theories of polymer dynamics" @default.
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• W1996454772 doi "https://doi.org/10.1016/0022-3093(94)90565-7" @default.
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