HOMOPOLYMERIZATION, COPOLYMERIZATION AND TERPOLYMERIZATION OF 1,5-HEXADIENE USING A METHYLALUMOXANE ACTIVATED MONO-CP-AMIDO-COMPLEX

Homo- and copolymerizations of 1,5-hexadiene with ethene and styrene u sing halfsandwich metallocene catalyst Me(2)Si(Me(4)Cp)(N-tert.-butyl) TiCl2 / MAO (Cp = cyclopentadienyl, Me = methyl, MAO = methylalumoxane ) were investigated. According to C-13-NMR spectroscopic microstructur e analysis, cyclopolymerization of 1,5-hexadiene afforded randomly dis tributed cis- and trans-cyclopentane rings in the homo- and copolymer backbone. 1,5-hexadiene incorporation reached 52 mel-%. The ratio of v inyl side chains to cyclopentane rings was controlled by 1,5-hexadiene concentration, where low 1,5-hexadiene concentration promoted cyclopo lymerization. Copolymer glass transition temperatures increased with i ncreasing content of cyclic units in the backbone. Styrene was used su ccessfully as termonomer in ethene/1,5-hexadiene polymerization, resul ting in a semicrystalline terpolymer with cyclic and styrenic units in the polymer backbone.