Stereoregular, alternating ethylene–norbornene copolymers from monocyclopentadienyl catalysts activated with non-coordinating discrete anions

Harrington, Bruce A.; Crowther, Donna J.

doi:10.1016/s1381-1169(97)00164-7

Cited by 94 publications

(60 citation statements)

References 7 publications

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“…The groups of signals and the chemical shifts are consistent with those reported in previous works 7- 13,16) and are characteristic for ethylene-norbornene copolymers with cis-2,3-exo-norbornene units inserted without ring opening. No signals indicative of endo-enchainment were C spectra during the present study a .…”

Section: C-enriched Ethene Catalyst Systems Ipr[(3-mecp)flu]zrcl 2 /supporting

confidence: 90%

13C NMR studies of ethene-norbornene copolymers: assignment of sequence distributions using13C-enriched monomers and determination of the copolymerization parameters

Wendt

Mynott

Hauschild

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: Ethene and norbornene were copolymerized using metallocene catalysts that produce copolymers having isolated norbornene units or microblocks with a maximum of two norbornene units. The resonances of the norbornene C 5/6 and the ethene carbon atoms, which overlap extensively in the 13 C NMR spectrum, were differentiated and assigned by comparing the 13 C NMR spectra of the copolymers obtained from monomers having 13 C at natural abundance with those prepared from feedstocks containing 13 C 1 -enriched ethene or 13 C 5/6 -enriched norbornene. The NMR analysis revealed that the chemical shifts of the norbornene C 5/6 carbon atoms are triad sensitive and those of the ethene carbon atoms are pentad sensitive. 13C NMR analysis of copolymers containing isolated norbornene units in various proportions allowed the resonances of the norbornene C 5/6 and the ethene carbon atoms to be assigned to the respective triads and pentads. The complete triad distributions of these copolymers determined in this way were used to calculate the copolymerization parameters for a representative metallocene catalyst.

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Section: C-enriched Ethene Catalyst Systems Ipr[(3-mecp)flu]zrcl 2 /supporting

confidence: 90%

13C NMR studies of ethene-norbornene copolymers: assignment of sequence distributions using13C-enriched monomers and determination of the copolymerization parameters

Wendt

Mynott

Hauschild

et al. 1999

Macromol. Chem. Phys.

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“…Indeed, copolymers with similar norbornene contents result in various glass transition temperatures. Harrington et al [9] studied two copolymers with different microstructures: random and stereoregular/ alternating microstructure. The results showed that copolymers with similar norbornene contents had significantly different glass transition temperatures.…”

Section: Influence Of the Polymer Microstructure On The Thermal Propementioning

confidence: 99%

Influence of the Polymer Microstructure on the Thermal Properties of Cycloolefin Copolymers with High Norbornene Contents

Forsyth¹,

Pereña

Benavente

et al. 2001

Macromol. Chem. Phys.

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“…Many have reported on ethylene copolymerization with norbornene (NBE) using ordinary metallocenes [10][11][12][13][14][15][16][17], half-titanocenes [18][19][20][21][22][23][24][25][26], and others [27][28][29][30], however, successful examples of the efficient synthesis of random, high molecular weight copolymers with high Tg values (high NBE content) have been limited. Ethylene copolymers with tetracyclododecene (TCD, dimethanooctahydronaphthalene) are also known as promising materials [9], and are produced by using classical Ziegler-type vanadium catalyst systems (VOCl3, VO(OEt)Cl2-EtAlCl2•Et2AlCl, etc.)…”

Section: Introductionmentioning

confidence: 99%

Design of Efficient Molecular Catalysts for Synthesis of Cyclic Olefin Copolymers (COC) by Copolymerization of Ethylene and α-Olefins with Norbornene or Tetracyclododecene

Zhao

Nomura

2016

Catalysts

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Abstract:Selected results for the synthesis of cyclic olefin copolymers (COCs)-especially copolymerizations of norbornene (NBE) or tetracyclododecene (TCD) with ethylene and α-olefins (1-hexene, 1-octene, 1-dodecene)-using group 4 transition metal (titanium and zirconium) complex catalysts have been reviewed. Half-titanocenes containing an anionic ancillary donor ligand, Cp'TiX 2 (Y) (Cp' = cyclopentadienyl; X = halogen, alkyl; Y = anionic donor ligand such as aryloxo, ketimide, imidazolin-2-iminato, etc.), are effective catalysts for efficient synthesis of new COCs; ligand modifications play an important role for the desired copolymerization. These new COCs possess promising properties (high transparency, thermal resistance (high glass transition temperature), low water absorption, etc.), thus it is demonstrated that the design of an efficient catalyst plays an essential role for the synthesis of new fine polyolefins with specified properties.

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Stereoregular, alternating ethylene–norbornene copolymers from monocyclopentadienyl catalysts activated with non-coordinating discrete anions

Cited by 94 publications

References 7 publications

13C NMR studies of ethene-norbornene copolymers: assignment of sequence distributions using13C-enriched monomers and determination of the copolymerization parameters

13C NMR studies of ethene-norbornene copolymers: assignment of sequence distributions using13C-enriched monomers and determination of the copolymerization parameters

Influence of the Polymer Microstructure on the Thermal Properties of Cycloolefin Copolymers with High Norbornene Contents

Design of Efficient Molecular Catalysts for Synthesis of Cyclic Olefin Copolymers (COC) by Copolymerization of Ethylene and α-Olefins with Norbornene or Tetracyclododecene

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