Macromolecular Symposia · 2006 · 11 citations · 10 references
Natural SciencesChemical EngineeringChemistryOrganic ChemistryPolymer ChemistryPolymer EngineeringPolymer ProcessingPolymer ProductionPolymer StructurePolymer SynthesisPolymerization ChemistryPolymerization ProcessesCopolymer ProductionCopolymerizationCopolymerization StrategiesCrystallizationFractional CrystallizationHigh-temperature PolymerizationPolypropyleneSyndiotactic Polymerization
Abstract Copolymers of propene and ethene‐based macromers have been prepared in a direct copolymerization. First macromers in a range of 3000–11600 g/mol were synthesized by varying the polymerization temperature and ethene concentration with the metallocene catalyst [(CH 3 ) 2 CCp 2 ]ZrCl 2 /MAO. These vinyl terminated ethene oligomers were copolymerized with propene by C s symmetric catalyst [Ph 2 C(Cp)(Flu)]ZrCl 2 to a long‐chain branched syndiotactic polypropylene. The LCB‐sPP was separated from the bimodal product by a fractional crystallization with p‐xylene and 2 ‐ ethoxy ethanol at 130 °C. A detailed analysis of the purified copolymer was given by GPC, DSC and 13 C NMR spectroscopy.
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Structure and Properties of Homogeneous Copolymers of Propylene and 1-Hexene
B. Poon, M. Rogunova, A. Hiltner et al. · Macromolecules · 2005 · 143 citations