Solid‐state NMR study of cyclo‐olefin copolymer (COC)

Huang, Wu‐Jang; Feng, Chao; Chu, Peter P.

doi:10.1002/1099-0488(20001001)38:19<2554::aid-polb70>3.0.co;2-#

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…[3] The 13 (3) and (4) of vinyl addition polymer structures of norbornene, respectively. [10] The microstructure of the polymers obtained by the palladium complexes could not be analyzed because of their insolubility. Partial information on the conformation of the polynorbornenes obtained by all the nickel-and palladiumbased complexes was obtained by means of wide-angle X-ray diffraction (WAXD), as shown in Figure 3.…”

Section: Microstructure and Thermal Analyses Of Polynorbornenesmentioning

confidence: 99%

Homo‐ and Copolymerization of Norbornene and Styrene with Pd‐ and Ni‐Based Novel Bridged Dinuclear Diimine Complexes and MAO

Wang

et al. 2003

Macro Chemistry & Physics

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Novel bridged dinuclear diimine nickel and palladium complexes catalyzed the vinyl addition polymerization of norbornene at a single active site with high activity. The latter exhibited higher activity than the former. Smaller substituents around the imido group in the ligand were more favorable for increasing the activity than bulkier ones. The polynorbornenes were all noncrystalline but had short‐range order and their glass transition temperature, Tg, ranged from 270 to 400 °C. Furthermore, the random copolymerization of norbornene and styrene was catalyzed by the bridged dinuclear diimine nickel complex with MAO (methylaluminoxane). Gel permeation chromatography (GPC), FTIR and 1H NMR spectroscopies, wide‐angle X‐ray diffraction (WAXD), and differential scanning calorimetry (DSC) indicated that the copolymers are “true” copolymers. The reactivity ratios were rstyrene = 0.281, rnorbornene = 18.7. The packing density, thermostability and the glass transition temperatures of copolymers are increased relative to polystyrene. The solubility and processability of the copolymers are improved relative to polynorbornene.

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Section: Microstructure and Thermal Analyses Of Polynorbornenesmentioning

confidence: 99%

Homo‐ and Copolymerization of Norbornene and Styrene with Pd‐ and Ni‐Based Novel Bridged Dinuclear Diimine Complexes and MAO

Wang

et al. 2003

Macro Chemistry & Physics

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“…Ethene/norbornene copolymers with high norbornene content (X N > 0.6) are mostly insoluble in common solvents which results in a drastic broadening of the liquid-state 13 C NMR signals. Since this characterization method is inappropriate for polymers with high norbornene contents solid-state NMR studies have been done additionally [17].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis-GC/MS: An alternative approach to characterize cycloolefin copolymers (COC)

Donner¹,

Kiesewetter²,

Kaminsky³

2007

Journal of Analytical and Applied Pyrolysis

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Vinyl polymerization of norbornene with dinuclear diimine nickel dichloride/MAO

Cui

et al. 2003

J of Applied Polymer Sci

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ABSTRACT:Vinyl-addition polymerization of norbornene was accomplished by two novel dinuclear diimine nickel dichloride complexes in combination with methylaluminoxane (MAO). The activities were moderate. The catalyst structure, Al/Ni molar ratio, solvents, and polymerization temperature all affected the catalytic activities. The obtained polynorbornenes were characterized by 1 H-NMR, 13 C-NMR, FTIR, DSC, WAXD, and intrinsic viscosity measurements. The vinyl-addition polymers were amorphous but with a short-range order and high packing density. The polynorbornenes showed glass transition temperatures (T g ) above 240°C and decomposed above 400°C. The catalyst structure and polymerization conditions have effects on the molecular weight and the microstructure of the polymers. The nickel complex with bulkier substituents in the ligand produced polynorbornene with a higher packing density and higher regularity and, therefore, with higher T g .

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Solid‐state NMR study of cyclo‐olefin copolymer (COC)

Cited by 8 publications

References 15 publications

Homo‐ and Copolymerization of Norbornene and Styrene with Pd‐ and Ni‐Based Novel Bridged Dinuclear Diimine Complexes and MAO

Homo‐ and Copolymerization of Norbornene and Styrene with Pd‐ and Ni‐Based Novel Bridged Dinuclear Diimine Complexes and MAO

Pyrolysis-GC/MS: An alternative approach to characterize cycloolefin copolymers (COC)

Vinyl polymerization of norbornene with dinuclear diimine nickel dichloride/MAO

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