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Synthesis of vinyl-terminated isotactic poly(propylene)
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2000
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EngineeringOrganic ChemistryChemistryPolymersPolymer MaterialMacromolecular EngineeringPolymer ProcessingPolymer ChemistryChain Termination StepMaterials ScienceVinyl-terminated PolyPolymer EngineeringVinyl-terminated Isotactic PolyIsotactic PolyPolymer SciencePolymer CharacterizationPolymerization KineticsFunctional PolymerPolymer ReactionPolymer Synthesis
Isotactic poly(propylene)s with 60–80% vinyl chain-end selectivity were synthesized with metallocene catalysts. Some of these vinyl-terminated poly(propylene)s are highly stereoregular (mmmm pentads up to 95%) and have high crystalline melting points in the range of 140–150°C. Chain-end analysis using 13C NMR indicates the vinyl chain-ends in the polymer are most likely formed through β-methyl elimination in the chain termination step.