Abstract
The mean-square internal chain distances of the first four normal modes have been computed to investigate the effects of local chain expansion on the dynamics. The distribution of lifetimes of pair contacts between nonadjacent chain segments has also been determined. It is found that the observed distribution of pair contact lifetimes provides a possible explanation for the slowing of the motions of the third Rouse mode found recently by Downey and Kovac. The results are qualitatively consistent with the physical mechanism responsible for the «gel modes» introduced by Brochard and de Gennes
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