Highly isotactic polypropene prepared with rac-dimethylsilyl-bis (2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride: An NMR investigation of the polymer microstructure

Bernhard Rieger; Annette Reinmuth; Werner Röll; H. H. Brintzinger

doi:10.1016/0304-5102(93)80071-2

Highly isotactic polypropene prepared with rac-dimethylsilyl-bis (2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride: An NMR investigation of the polymer microstructure

Bernhard Rieger, Annette Reinmuth, Werner Röll, H. H. Brintzinger

Research output: Contribution to journal › Article › peer-review

69 Scopus citations

Abstract

Isotactic polypropene was prepared using rac-dimethyl-silylbis(2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride (1) and methylalumoxane (MAO) at temperatures between 0 and 80°C and with Al/Zr ratios of 300 and 1500. The polymers, prepared at temperatures below 30°C had melting points of 162°C and above. The chain ends were determined by means of distortionless enhancement by polarization transfer (DEPT)-NMR spectroscopy. The pentad intensities were corrected according to the chemical shifts of the end groups. The intensity distributions are shown to arise from enantiomorphic site control of the chiral catalyst species.

Original language	English
Pages (from-to)	67-73
Number of pages	7
Journal	Journal of Molecular Catalysis
Volume	82
Issue number	1
DOIs	https://doi.org/10.1016/0304-5102(93)80071-2
State	Published - 11 Jun 1993
Externally published	Yes

Keywords

chiral zirconocenes
isotactic polypropene
stereospecific olefin polymerization

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10.1016/0304-5102(93)80071-2

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title = "Highly isotactic polypropene prepared with rac-dimethylsilyl-bis (2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride: An NMR investigation of the polymer microstructure",

abstract = "Isotactic polypropene was prepared using rac-dimethyl-silylbis(2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride (1) and methylalumoxane (MAO) at temperatures between 0 and 80°C and with Al/Zr ratios of 300 and 1500. The polymers, prepared at temperatures below 30°C had melting points of 162°C and above. The chain ends were determined by means of distortionless enhancement by polarization transfer (DEPT)-NMR spectroscopy. The pentad intensities were corrected according to the chemical shifts of the end groups. The intensity distributions are shown to arise from enantiomorphic site control of the chiral catalyst species.",

keywords = "chiral zirconocenes, isotactic polypropene, stereospecific olefin polymerization",

author = "Bernhard Rieger and Annette Reinmuth and Werner R{\"o}ll and Brintzinger, {H. H.}",

year = "1993",

month = jun,

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doi = "10.1016/0304-5102(93)80071-2",

language = "English",

volume = "82",

pages = "67--73",

journal = "Journal of Molecular Catalysis",

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number = "1",

}

Highly isotactic polypropene prepared with rac-dimethylsilyl-bis (2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride: An NMR investigation of the polymer microstructure. / Rieger, Bernhard; Reinmuth, Annette; Röll, Werner et al.
In: Journal of Molecular Catalysis, Vol. 82, No. 1, 11.06.1993, p. 67-73.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Highly isotactic polypropene prepared with rac-dimethylsilyl-bis (2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride

T2 - An NMR investigation of the polymer microstructure

AU - Rieger, Bernhard

AU - Reinmuth, Annette

AU - Röll, Werner

AU - Brintzinger, H. H.

PY - 1993/6/11

Y1 - 1993/6/11

N2 - Isotactic polypropene was prepared using rac-dimethyl-silylbis(2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride (1) and methylalumoxane (MAO) at temperatures between 0 and 80°C and with Al/Zr ratios of 300 and 1500. The polymers, prepared at temperatures below 30°C had melting points of 162°C and above. The chain ends were determined by means of distortionless enhancement by polarization transfer (DEPT)-NMR spectroscopy. The pentad intensities were corrected according to the chemical shifts of the end groups. The intensity distributions are shown to arise from enantiomorphic site control of the chiral catalyst species.

AB - Isotactic polypropene was prepared using rac-dimethyl-silylbis(2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride (1) and methylalumoxane (MAO) at temperatures between 0 and 80°C and with Al/Zr ratios of 300 and 1500. The polymers, prepared at temperatures below 30°C had melting points of 162°C and above. The chain ends were determined by means of distortionless enhancement by polarization transfer (DEPT)-NMR spectroscopy. The pentad intensities were corrected according to the chemical shifts of the end groups. The intensity distributions are shown to arise from enantiomorphic site control of the chiral catalyst species.

KW - chiral zirconocenes

KW - isotactic polypropene

KW - stereospecific olefin polymerization

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U2 - 10.1016/0304-5102(93)80071-2

DO - 10.1016/0304-5102(93)80071-2

M3 - Article

AN - SCOPUS:0027611177

SN - 0304-5102

VL - 82

SP - 67

EP - 73

JO - Journal of Molecular Catalysis

JF - Journal of Molecular Catalysis

IS - 1

ER -

Highly isotactic polypropene prepared with rac-dimethylsilyl-bis (2-methyl-4-t-butyl-cyclopentadienyl) zirconiumdichloride: An NMR investigation of the polymer microstructure

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Keywords

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