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Variation in the character of molecular motions during the swelling of a linear polymer

The effect of swelling of a linear PB in CCI 4 on the character of macromolecular motions was studied by measuring the temperature dependence of the spin-lattice nuclear magnetic relaxation measured under the multipulse spin-lock conditions. In the case of small degrees of swelling, the temperature dependence of the relaxation time comprises three portions corresponding to three modes of the macromolecular motion. The passage to high degrees of swelling is accompanied by increasing the entanglement length N e and the number of macromolecular segments participating in the small-scale motions.