A Monte Carlo dynamics study of the motions of hydrocarbon chains containingcisdouble bonds is presented. The simulations utilize the highhyphen;coordination lcub;2 1 0rcub; lattice for the simultaneous representation of the tetrahedrally bonded carbon atoms and the planar unsaturated segment. Results on single chains undergoing free motion in space and tethered to an impenetrable planar interface are reported. The introduction of acisdouble bond into a hydrocarbon chain induces a slowdown in the dynamics. The simulations show this to be a universal result independent of the representation of the chain on the lattice. In contrast, polyunsaturated chains are found to be more mobile than saturated ones.
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