Ring-Opening Polymerization of ε-caprolactone Using Organoaluminum-based Complexes Bearing Amido-amine Bidentate Ligand and A Study of Ligand Effect
Date Issued
2010
Date
2010
Author(s)
Lin, Hsin-Wei
Abstract
A numbers of organoaluminum complexes bearing nitrogen-donating bidentate ligands of amido-amine such as (C2H5)2NC(CH3)2CCH3N(Ar) [Ar = p-methoxyphenyl, p-methylphenyl, Phenyl, p-fluorophenyl, p-chlorophenyl, 2,6-diisopropylphenyl] and anilido-pyridine ligands with formula of (C5H5N)C(CH3)2NH(Ar'') [Ar'' = Phenyl, 2,6-dimethylphenyl, 2,6-diisopropylphenyl] are synthesized and characterized.
These mononuclear complexes are found in distorted tetrahedral geometry. The aluminum complexes are able to activate the ring-opening polymerization(ROP) of ε-caprolactone without using activators in toluene. The resulting polyester products show comparable activity and acceptable molecular weights distribution. (Mw/Mn<2). With assistance of benzyl alcohol, ROP could undergo with acceptable activity and controlable molecular weight distribution (Mw/Mn <2).
Mechanistic studies for such ROP reactions particularly in terms of ligand effect are thus investigated.
Subjects
Aluminum
electronic effect
caprolactone
polyester
ring-opening polymerization
ROP
Type
thesis
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