STRETCHED EXPONENTIAL RELAXATION BEHAVIOR OF OFF-LATTICE POLYMER-CHAINS

The effects of both chain connectivity and excluded volume on the dyna mical behavior of polymer chain; have been simulated. An off-lattice 6 3- and 99-bead Monte Carlo simulation model was used which permits a w ide range of angular geometries and rotational angles. The relaxation behavior of the end-to-end vector was fitted about equally well by sim ple exponentials a exp(-t/tau(1)) and stretched exponentials exp(-(t/t au)(1-n)) for all the intramolecular effects simulated. Chain connect ivity and excluded volume significantly increase tau, while the expon ent 1-n seems rather insensitive to the presence or absence of these i ntramolecular interactions.