Ethylene-co-norbornene Copolymerization Using a Dual Catalyst System in the Presence of a Chain Transfer Agent.

ABSTRACT: Ethylene-co-norbornene copolymers were synthesized by a dual catalyst system at three concentrations of norbornene in the feed and variable amounts of ZnEt?, as a possible chain transfer agent. The dual catalyst system consists of two ansa-metallocenes, isopropyliden(?^5-cyclopentadienyl)(??-indenyl)zirconium dichloride (1) and isopropyliden(??-3-methylcyclopentadienyl)(??-fluorenyl)zirconium dichloride (2), activated with dimethylanilinium tetrakis(pentafluorophenyl)borate, in presence of TIBA. Values of norbornene content, molecular mass, glass transition temperature, and reactivity ratios r₁₁ and r₂₁ of copolymers prepared in the presence of 1+2 are intermediate between those of reference copolymers. The study of tensile and elastic properties of ethylene-co-norbornene copolymers (poly(E-co-N)s) gave evidence that copolymers were obtained in part through transfer of polymer chains between different transition metal sites. Mechanical properties are clearly different from those expected from a blend of the parent samples and reveal that copolymers obtained in the presence of 1+2 and ZnEt? consist of a reactor blend of segmented chains produced by exchange from 2 to 1 and 1 to 2 acting as the ideal compatibilizer of chains produced by the chain transfer from 1 to 1, and from 2 to 2.

SUBMITTER: Boggioni L 

PROVIDER: S-EPMC6473246 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature