13C n.m.r. study of the microstructure of polynorbornadiene

Mizuno, Akira; Onda, Mitsuhiko; Sagane, Toshihiro

doi:10.1016/0032-3861(91)90192-l

Cited by 13 publications

(16 citation statements)

References 8 publications

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“…The ratio of repeat units ( I / II ), determined by the integration of the C

_{I}^{1}

_{II}^{1}

signals, is about equal (53/47). This ratio is very similar to data obtained by other workers17, 18 for cationically (AlCl 3 and Et 2 AlCl/tBuCl) prepared PNBD. Contrary to earlier reports,17, 18 we were able to detect a small amount of endo/endo linkages ( III ) as well.…”

Section: Resultssupporting

confidence: 91%

“…This ratio is very similar to data obtained by other workers17, 18 for cationically (AlCl 3 and Et 2 AlCl/tBuCl) prepared PNBD. Contrary to earlier reports,17, 18 we were able to detect a small amount of endo/endo linkages ( III ) as well.…”

Section: Resultssupporting

confidence: 91%

“…Table 2 summarizes 13 C shifts of the head groups, repeat units, and tail groups 17, 18. PNBD contains mainly exo/exo ( I ) and exo/endo ( II ) repeat units.…”

Section: Resultsmentioning

confidence: 99%

“…AlCl 3 at very low temperatures (i.e., −123 °C) yielded soluble PNBD, whereas at −78 °C, a crosslinked fraction was also obtained 14, 15. Grattan and Plesch16 produced noncrosslinked PNBD with AlBr 3 at −125 °C, and Sagane et al17 obtained a partially crosslinked polymer with EtAlCl 2 / tert ‐BuCl at −50 °C. In addition, the latter group synthesized model compounds to identify repeat unit connectivities.…”

Section: Introductionmentioning

confidence: 99%

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Disassembly of a rotablator: Getting out of a trap

Prasan

Patel

Pitney

et al. 2003

Cathet Cardio Intervent

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“…The ratio of repeat units ( I / II ), determined by the integration of the C

_{I}^{1}

_{II}^{1}

Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 91%

“…Table 2 summarizes 13 C shifts of the head groups, repeat units, and tail groups 17, 18. PNBD contains mainly exo/exo ( I ) and exo/endo ( II ) repeat units.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Disassembly of a rotablator: Getting out of a trap

Prasan

Patel

Pitney

et al. 2003

Cathet Cardio Intervent

View full text Add to dashboard Cite

show abstract

“…The ratio of repeat units (I/II), determined by the integration of the C I 1 /C II 1 signals, is about equal (53/47). This ratio is very similar to data obtained by other workers 17,18 for cationically (AlCl 3 and Et 2 AlCl/tBuCl) prepared PNBD. Contrary to earlier reports, 17,18 we were able to detect a small amount of endo/endo linkages (III) as well.…”

Section: Structure Of Pnbdsupporting

confidence: 91%

Cationic polymerization of norbornadiene

Peetz

Moustafa

Kennedy

2003

J. Polym. Sci. A Polym. Chem.

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The polymerization of norbornadiene (NBD) initiated by the 2‐chloro‐2,4,4‐trimethylpentane/titanium tetrachloride system was investigated. Efforts were made to develop conditions for the living polymerization of NBD by the use of proton trap and electron donor in the −35 to −60 °C range however this objective was only partially attained. The molecular weights increased linearly with conversion, and the rate was first‐order in confirmed monomer concentration up to approximately 25%; however, chain transfer became operational beyond this range. The microstructure of polynorbornadiene (PNBD) was investigated by high‐resolution 1H and 13C NMR spectroscopy. According to these techniques, the chain consisted of about equal amounts of exo/exo and exo/endo connected tricyclic repeat units. The head and tail groups were identified and quantitated, and this led to absolute molecular weight determination by integration. Molecular weights obtained by this method and by gel permeation chromatography (relative to polyisobutylene standards) were in good agreement. NMR spectroscopy indicated the presence of small but still identifiable amounts of branching units and their structures. The plot of the glass‐transition temperature against the reciprocal of the number‐average molecular weight was linear and yielded a glass‐transition temperature of 323 °C for the infinite molecular weight polymer. According to thermogravimetric analysis, PNBD was stable up to approximately 250 °C and showed a 5% weight loss at approximately 335 °C. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 732–739, 2003

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MoCl5/EtAlCl2-catalysed nonmetathesis polymerization of norbornadiene

Balcioglu

Tunoglu

1996

J. Polym. Sci. A Polym. Chem.

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13C n.m.r. study of the microstructure of polynorbornadiene

Cited by 13 publications

References 8 publications

Disassembly of a rotablator: Getting out of a trap

Disassembly of a rotablator: Getting out of a trap

Cationic polymerization of norbornadiene

MoCl5/EtAlCl2-catalysed nonmetathesis polymerization of norbornadiene

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