High molecular weight atactic polypropene synthesized with (?5-pentamethylcyclopentadienyl)tribenzyl titanium activated with MAO

This report describes propylene polymerization reactions with titanium complexes bearing carbamato ligands, Ti(O 2 CNMe 2 )Cl 2 (I) and Ti(O 2 CR 2 ) 4 [R 2 5 NMe 2 (II), NEt 2 (III) and (IV)]. Combinations of these complexes and MAO form catalysts for the synthesis of atactic polypropylene, as confirmed by FT-IR, DSC and 13 C NMR analysis. Effects of main reaction parameters on the catalyst activity were studied including the type of complex, solvent, temperature, and the [Al]/[Ti] molar ratio. The highest activity was observed when chlorobenzene was used as a solvent and AlMe 3depleted MAO was employed as a cocatalyst. V C 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4095-4102

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“…The pentad distribution, determined from the peak intensities of the P ββ methyl region in the 19–22 ppm range is reported in Table .…”

Section: Resultsmentioning

confidence: 99%

Titanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions

Hayatifar

Forte

Pampaloni

et al. 2013

J. Polym. Sci. Part A: Polym. Chem.

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“…[6] Preparation of SiO 2 -Supported Cp*TiMe 3 Catalysts [6] Preparation of SiO 2 -Supported Cp*TiMe 3 Catalysts…”

Section: Trioctylaluminummentioning

confidence: 99%

CONTROL OF REGIOSPECIFICITY IN PROPENE POLYMERIZATION WITH SiO₂-SUPPORTED Cp*TiMe₃CATALYSTS

Ioku

Shiono

Ikeda

2002

Journal of Macromolecular Science, Part A

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“…Elastomeric polypropylenes (ePP) can be produced by a number of different synthetic strategies. − More recently, several classes of metallocene catalysts have been developed for the production of elastomeric polypropylenes, − notably those developed by Chien, − Collins, − Rieger, , Erker, and our group. − The structures and properties of the elastomeric polypropylenes produced from from unbridged 2-arylindene metallocene catalysts 32-51 are compositionally heterogeneous and can be separated into fractions of different tacticity, crystallinity, and molar mass. , Successive boiling-solvent extraction yields three fractions: a low tacticity ether-soluble fraction (ES), an intermediate tacticity heptane-soluble fraction (HS), and a high tacticity heptane-insoluble (HI) fraction.…”

Section: Introductionmentioning

confidence: 99%

Component Stress−Strain Behavior and Small-Angle Neutron Scattering Investigation of Stereoblock Elastomeric Polypropylene

Wiyatno¹,

Fuller²,

Pople

et al. 2003

Macromolecules

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Elastomeric polypropylene (ePP) produced from unbridged 2-arylindene metallocene catalysts was studied by uniaxial tensile and small-angle neutron scattering (SANS) techniques. The ePP can be separated into the following: a low tacticity fraction soluble in ether (ES), an intermediate tacticity fraction soluble in heptane (HS), and a high tacticity fraction insoluble in heptane (HI). Tensile properties of ePP were compared to its solvent fractions, and the role of each solvent fraction residing within ePP was investigated by blending 5 wt % deuterated fraction with ePP. The tensile properties of each fraction vary considerably, exhibiting properties from a weak gum elastomer for ES, to a semicrystalline thermoplastic for HI. The intermediate tacticity HS fraction exhibits elastic properties similar to the parent elastomer (ePP). In the melt at 160 °C, SANS shows that all deuterated fractions are homogeneously mixed with ePP. Slow cooling from the melt to 25 °C causes the low tacticity fraction to preferentially segregate in amorphous domains due to different crystallization temperatures and kinetics although, despite its low crystallinity (≤2%), the low tacticity fraction can cocrystallize with the matrix. The dES-ePP shows little or no relaxation when held under strain and recovers readily upon the release of stress. The high tacticity component (dHI-ePP) retains its plastic properties in the blend.

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High molecular weight atactic polypropene synthesized with (?5-pentamethylcyclopentadienyl)tribenzyl titanium activated with MAO

Cited by 15 publications

References 21 publications

Titanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions

Titanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions

CONTROL OF REGIOSPECIFICITY IN PROPENE POLYMERIZATION WITH SiO₂-SUPPORTED Cp*TiMe₃CATALYSTS

Component Stress−Strain Behavior and Small-Angle Neutron Scattering Investigation of Stereoblock Elastomeric Polypropylene

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High molecular weight atactic polypropene synthesized with (?5-pentamethylcyclopentadienyl)tribenzyl titanium activated with MAO

Cited by 15 publications

References 21 publications

Titanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions

Titanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions

CONTROL OF REGIOSPECIFICITY IN PROPENE POLYMERIZATION WITH SiO2-SUPPORTED Cp*TiMe3CATALYSTS

Component Stress−Strain Behavior and Small-Angle Neutron Scattering Investigation of Stereoblock Elastomeric Polypropylene

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CONTROL OF REGIOSPECIFICITY IN PROPENE POLYMERIZATION WITH SiO₂-SUPPORTED Cp*TiMe₃CATALYSTS