THE KINEMATICS OF A SEGMENT OF POLYACRYLO NITRILE MACROMOLECULE IN UNIAXIALLY ORIENTED MATERIAL

Mathematical modeling of the spectrum of possible positions of the bac kbone atoms is oriented molecules of iso- and syndiotactic polyacrylon itrile was performed for varied positions of moving segment of macromo lecule. The structural unit for modeling was a segment including eight atoms of the backbone with the end atoms fixed. The segment has one d egree of freedom. The spectrum of segmental kinematic state is calcula ted by solving the non-linear equation set that describes the coordina tes of atoms of the moving segment of molecular backbone. It is discov ered that only syndiotactic PAN can form the local spatial configurati on that is a precursor for intramolecular six-member cycle being forme d during thermal treatment of PAN.