Macromolecular Rapid Communications · 2001 · 122 citations · 0 references
Natural SciencesChemistryMaterials ScienceMaterials ChemistryPolymer ChemistryPolymer MaterialsCoordination PolymersPolymer FunctionalizationPolymer ProductionPolymer StructurePolymer SynthesisPolymerization ChemistryChemical PolymerizationCoordination Polymer SynthesisLiving Olefin PolymerizationPolymer Microstructure ControlPolymeric NanostructuresPropylene Polymerization
Highly syndiotactic “living” poly(propylene)s were synthesized at 25°C using a bis[N-(3-tert-butylsalicylidene)-2,3,4,5,6-pentafluoroanilinato]titanium (IV) dichloride/MAO catalyst system, and microstructures of the polymer were analyzed by means of 13C NMR spectroscopy. The syndiotactic poly(propylene) contains isobutyl, isopentyl and propyl end groups, suggesting that the living polymerization of propylene was initiated via 1,2-insertion, followed by 2,1-insertion as the principal mode of polymerization. Pentad distribution analysis revealed that the syndiospecific polymerization proceeds under chain-end control.