The expansion of subchains of a single excluded volume chain in two and three dimensions was studied using the bond-fluctuation model. The average expansion factor of subchains containing n segments shows a maximum for n < N, where N is the number of bonds of the whole chain. The subchains are more swollen than an isolated chain containing the same number of segments, and this excess swelling is most pronounced in the center of the chain. Both the behavior of the average expansion factor and the excess swelling can be described using the analytical results of Duplantier and of Schäfer and Baumgärtner, particularly in three dimensions.
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Wittkop et al. (1996) studied this question.
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