title: Synthesis of ultrahigh-molecular-weight ethylene-1-hexene copolymers with high hexene content via living polymerization with fluorinated bis(phenoxy-imine) titanium(IV).
abstract: The fluorinated FI-Ti catalyst bis[N-(3-propylsalicylidene)-pentafluoroanilinato] titanium(IV) dichloride (PFI) combined with dried methylaluminoxane (dMAO) is investigated for ethylene/1-hexene copolymerization at 50 °C under atmospheric pressure. The reaction shows good livingness and has a high activity at high [H]/[E] molar ratios up to 14. Ultrahigh molecular weight (>1.4 × 10(6) g mol(-1) ) copolymers with high 1-hexene content (>25 mol%) are prepared. Kinetic parameters of the copolymerization with PFI are determined. The first-order Markov statistics applies and the product of the reactivity ratios r1 r2 is close to 1, giving random unit distributions.
authors.affiliation: State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
authors.forename: Song
authors.initials: S
authors.lastname: Guo
authors.forename: Hong
authors.initials: H
authors.lastname: Fan
authors.forename: Zhiyang
authors.initials: Z
authors.lastname: Bu
authors.forename: Bo-Geng
authors.initials: BG
authors.lastname: Li
authors.forename: Shiping
authors.initials: S
authors.lastname: Zhu
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D015394:Molecular Structure; D008970:Molecular Weight; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D000475:Alkenes; D011108:Polymers; C117224:1-hexene; D014025:Titanium
keywords: FI catalyst; ethylene-1-hexene copolymers; living polymerization; reactivity ratios; ultrahigh molecular weight