Syndiospecific polymerization of styrene catalyzed by half-titanocene catalysts

Synthesis, structure, and properties of syndiotactic polystyrene catalyzed by Cp*Ti(OBz)3/MAO/TIBA

“…This steric advantage made monomer styrene insertion relative to chain termination mainly by β‐hydrogen elimination or sterically stabilize the active species. We studied the kinetics of styrene polymerization catalyzed by the half‐titanocenes examined 30. It was found that complexes with ligands of phenyl ring substituents were more stable and had higher catalytic activity than did complexes with no phenyl ring substituents.…”

Synthesis of (co-)polyethylene with broad molecular weight distribution by the heterogenous Ziegler–Natta catalysts via one-pot strategy

“…From Table 2 it can be noticed that the polymerization temperature obviously influenced the catalyst activity. The catalyst activity reached the highest value of 8.1 Â 10 6 g PE/mol Ti h at 70 8C, but the catalytic activity was less than the highest value whatever the temperature was less or higher than 70 8C [31][32][33][34]. Cat.…”

The architecture of hydroxy‐functionalized aPS‐b‐random copolymer‐b‐PE via one‐pot strategy combining living free radical polymerization with coordination polymerization

“…The residue was extracted with boiling tetrahydrofuran (THF) for 12 h to remove S ‐E random copolymer. The THF‐insoluble fraction was extracted with boiling CHCl 3 for 12 h to remove the insoluble sPS and PE homopolymer 11, 39–43. The CHCl 3 ‐soluble fraction (aPS‐b‐random copolymer‐b‐PE) was isolated by evaporation of solvent, dried under vacuum at 50°C, weighted, and analyzed by DSC, WAXD, GPC, 13 C‐NMR, and 1 H‐NMR spectroscopy.…”

“…* * Catalyst system: CpTiCl 3 /Zn/BDGE/St = 8/12/1/300; monomer: Styrene (3 mL); radical polymerization of styrene was carried out at 90 o C for 2.5 h in 1, 4‐dioxane (IE = 0.70, M n = 1.0 × 10 4 , MWD = 1.30). When the experiment was performed in a 300‐mL Schlenk following the literature,31, 39–43 the mixture color was changed into lime‐green, demonstrating the formation of metallocene complex radical CpTi • (III)Cl 2 . FTIR result confirmed that the opening of the epoxide ring of BDGE by metallocene complex radical CpTi • (III)Cl 2 took place by entire disappearing of the signal at 910.4 cm −1 attributed to epoxy group …”