A VIBRATION SPECTROSCOPIC STUDY OF THE ST RUCTURE OF POLYMERS OBTAINED BY ADDITION POLYMERIZATION OF NORBORNENE

IR spectra of polynorbornenes produced by different catalysts were stu died. A theoretical analysis of the forms of normal vibrations and the intensities of absorption bands was carried out for polymer chains in different conformations, A comparison of experimental and theoretical spectra evidenced that a polymer composed preferentially of exo, endo -diads was formed under the influence of Pd-based catalyst, whereas th e use of Ni- and Zr-containing systems resulted in the formation of po lymers with exe, exo- and endo, endo-diads in the chains. Polynorborne nes obtained using Ni-containing catalysts were not uniform with respe ct to conformational composition and involved the chains with differen t sets of exe, exo-cis- and exe, exo-trans-structures depending on the polymerization conditions.