Copolymerization of Ethylene and Vinyl Amino Acidic Ester Catalyzed by Titanium and Zirconium Complexes

Abstract

A series of titanium and zirconium complexes with ligands based on di-isopropyl phosphorus-phenylamine and their derivatives were synthesized and characterized. These catalysts were utilized to catalyze the copolymerization of ethylene with N-acetyl-O-(dec-9-enyl)-L-tyrosine ethyl ester with high catalytic activity of 6.63 × 10 4 g P (mol Ti)after activation by methylaluminoxane (MAO). The effects of ligand structure, metal atoms (Ti, Zr) and polymerization conditions were investigated in detail. The obtained polymers were characterized by 13 C-NMR, DSC, FT-IR, and GPC. The results showed that the obtained copolymer had a high comonomer incorporation rate of 2.56 mol % within the copolymer chain. The melting temperature of the copolymer was up to 138.9 °C, higher than that of the obtained homopolyethylene. OPEN ACCESSCatalysts 2015, 5 1832

Molecular Catalysis for Precise Olefin Polymerization and ROP 2015

“…Upon activation with MAO, high activity was observed for both the polymerization of ethylene and the copolymerization of ethylene/N-acetyl-O-(dec-9-enyl)-L-tyrosine with high co-monomer incorporation (2.56 mol%) for the latter case. The molecular weights associated with the copolymers were somewhat lower than those of the homopolymers [4].…”

“…In this Special Issue, manuscripts focusing on aspects of new catalyst systems for the homo-or co-polymerization of α-olefins, on the ring opening polymerization (ROP) of ε-caprolactone, and on co-polymerizations involving CO 2 /cyclohexene oxide are presented [3][4][5][6][7][8]. This work will be of immense interest to those involved in catalyst design, organometallic chemistry and polymer synthesis.…”

Highly Active Copolymerization of Ethylene and N-Acetyl-O-(ω-Alkenyl)-l-Tyrosine Ethyl Esters Catalyzed by Titanium Complex

“…Herein, we hope to synthesize polymers with pendent bioactive molecules through coordination polymerization. A series of non-metallocene catalysts were synthesized and discussed in terms of their catalytic behavior for the copolymerization of ethylene and N -acetyl- O -(ω-alkenyl)- l -tyrosine ethyl ester in detail in our previous study [ 26 , 27 ]. Titanium complex exhibited higher catalytic activity for the copolymerization of ethylene and N -acetyl- O -(ω-alkenyl)- l -tyrosine ethyl ester.…”