Macromolecular conformations in solutions. I. Model for chains with partial flexibility
Tóm tắt
Less-than fully flexible polymer chains in solution are considered. Each chain is represented by relatively rigid and with relatively low pervaded volume groupings of monomeric units called compact bundles, intercalated with extended bundles. A partition function for the system is constructed in terms of numbers of possible kinds of pairs of neighboring bundles, and of configurational energies. Results of the extremization of the partition function show an interplay of the interaction forces as decisive for the behavior of the system. The parameters characterizing the system are related to those in the Elory freevolume theory of liquids and solutions. The resulting equations enable evaluation of the relative concentration of compact bundles and of the numbers of pairs of neighboring bundles of different kinds. The model is related to some experimental evidence. Possible connections to structures of polymer-containing phases other than solutions are pointed out.
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