Abstract
The relation between conformational states and orientations of the diamond lattice chain is developed on the basis of the rotational-isomeric state model of polymer chains. Diamond lattice chains were generated by a restricted walk on a body-centred cubic lattice. Calculations of the partition function as a function of temperature were made for short polymethylene chains up to N = 16 bonds, with and without the presence of conformational states g ±g ∓. The configurational entropy was derived from the partition function using the canonical ensemble approach. It was found possible to extrapolate the value determined for the configurational entropy per bond to determine the value for infinite chains, there being a linear relation between configurational entropy and N.
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