VARIATION IN THE CHARACTER OF MOLECULAR MOTIONS DURING THE SWELLING OF A LINEAR POLYMER

The effect of swelling of a linear PB in CCl4 on the character of macr omolecular motions was studied by measuring the temperature dependence of the spin-lattice nuclear magnetic relaxation measured under the mu ltipulse spin-lock conditions. In the case of small degrees of swellin g, the temperature dependence of the relaxation time comprises three p ortions 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 part icipating in the small-scale motions.