Copolymerization of ethylene with a-olefins and cyclic olefins catalyzed by a Ti(IV) diisopropoxy complex bearing a tridentate [O¯,S,O¯]-type bis(phenolato) ligand
Artikel i vetenskaplig tidskrift, 2014

Ethylene (E) was copolymerized with some α-olefins [1-pentene (PEN), 1-hexene (HEX), and 4-methyl-1-pentene (4M1P)] and cyclic olefins [cyclopentene (CPE), norbornene (NB), and dicyclopentadiene (DCPD)] using the Ti(IV) thiobis(phenolate) complex [2,2′-S(4-Me,6-tBuC6H2O)2]Ti(OiPr)2 in combination with methylaluminoxane (MAO). The catalyst exhibited excellent activities (up to 106 g molTi−1 h−1). Crystalline E/α-olefin copolymers with a strong tendency for comonomer alternation were obtained with good comonomer incorporation (about 15 mol% for [Y]/[E] = 8; Y = comonomer) decreasing in the order HEX > PEN > 4M1P. Random copolymers with NB and DCPD were obtained with efficient comonomer incorporation (from 10 to 40 mol%) even for the Y/E molar ratio = 1 to 2, while the catalyst gave poor CPE incorporation. In order to collect information on the comonomer distribution in the copolymers, boiling solvent extraction was carried out and all the fractions were characterized by DSC, XRD, SEC, and NMR.

Titanium

Copolymerization

ethylene

catalysis

Ziegler-Natta

Författare

Massimiliano Mauri

Chalmers, Kemi- och bioteknik

Polymer Chemistry

1759-9954 (ISSN) 1759-9962 (eISSN)

5 3412-3423

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Ämneskategorier

Materialteknik

Kemi

Fundament

Grundläggande vetenskaper

Styrkeområden

Materialvetenskap

DOI

10.1039/C3PY01674A