Average bond conformations of polymer chains

In this pager, the average bond conformations of polypropylene chains in th e second-order interaction approximation. and of isotactic polypropyleneoxi de chains in the third-order interaction approximation are investigated. We calculate the a priori probabilities using numerical value calculation met hod. The average bond conformations may be used as a tool to assess the ene rgies of various rotational isomeric stages, especially for chains that hav e poorly defined rotational isomers. (C) 2000 Elsevier Science Ltd. All rig hts reserved.