Screening of metal complex catalysts using bidentate Schiff base ligands for controlled cationic polymerization of vinyl ethers using in situ complexation method

Abstract

Appropriate ligand scaffolds in cationic polymerization were screened using various bidentate Schiff base ligand/ZrCl4 initiating systems.

Structure–property relationship of phenoxyimine ligands/metal chloride initiating systems for controlled cationic polymerizations of alkyl vinyl ethers

“…The polymerization of IBVE using initiating systems consisting of ZrCl 4 and phenoxyimine ligands with a p ‐ or m ‐substituted phenyl ring was found to proceed in a controlled manner regardless of the substituents attached (Table ). Our previous work has demonstrated that the N ‐phenyl phenoxyimine ligand/ZrCl 4 initiating system is effective for the controlled cationic polymerization of IBVE in the presence of ethyl acetate in toluene at 0 °C (Table , Entry 5) . Various N ‐aryl phenoxyimine ligands possessing p‐ or m‐ substituents were used for cationic polymerizations under the same conditions.…”

“…S5). Thus, the polymerization was examined using phenoxyimine ligands with various substituents under similar conditions. In each case, the TiCl 4 and ligand mixture was transparent.…”

“…In our previous study, the N ‐phenyl phenoxyimine ligand/ZrCl 4 or TiCl 4 initiating systems were shown to induce the controlled cationic polymerization of isobutyl vinyl ether (IBVE) under appropriate conditions . In this article, the substituent effects of phenoxyimine ligands on cationic polymerization behaviors were investigated using the N ‐aryl phenoxyimine ligands with various substituents on the aniline moiety (Fig.…”