Topic
Norbornene
About: Norbornene is a research topic. Over the lifetime, 5628 publications have been published within this topic receiving 104495 citations. The topic is also known as: norbornylene & norcamphene.
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TL;DR: In this article, the microstructure of ethene/norbornene copolymers produced by metallocene/methylaluminoxane catalysts is investigated by 13C NMR spectroscopy.
Abstract: The microstructure of ethene/norbornene copolymers produced by metallocene/methylaluminoxane catalysts is investigated by 13C NMR spectroscopy. The microstructure of alternating copolymers is assigned on the pentad level by comparison of the pentad distribution in 13C NMR spectra with the calculated distribution according to the alternating mechanism. Norbornene block structures produced with different catalysts are compared, and norbornene diblock structures are assigned. Triad distributions for the alternating copolymers and diad distributions for copolymers containing diblocks were obtained.
79 citations
79 citations
78 citations
TL;DR: Post-ring-opening metathesis polymerization of the norbornene pendants of 1 enhances the thermal stability of the coiled assembly as well as the tubular one and disables a thermodynamic coil-to-tube transition.
Abstract: Newly designed norbornene-appended hexabenzocoronene 1 self-assembles, upon diffusion of an Et2O vapor into its CH2Cl2 solution, to form either graphitic nanocoils or nanotubes, depending on the self-assembling conditions. The coiled assembly, selectively formed at 15 °C, is a kinetic intermediate for the tubular assembly and transforms into nanotubes on standing at 25 °C. However, post-ring-opening metathesis polymerization of the norbornene pendants of 1 enhances the thermal stability of the coiled assembly as well as the tubular one and disables a thermodynamic coil-to-tube transition. The polymerized nanocoils show an electroconductivity of 1 × 10-4 S cm-1 upon doping with I2, while the nonpolymerized nanocoils are disrupted upon being doped.
78 citations
TL;DR: In this article, it was found that the use of B(C 6 F 5 ) 3 /triethylaluminium (TEA) in comparison to methylaluminoxane as an activator towards complexes 2, 3 and 5 gave comparable polymerization activities.
Abstract: Nickel(II) and palladium(II) complexes of the general type [MCl 2 {Ph 2 P(CH 2 ) n PPh 2 }] with n = 2, 3 and M = Ni (2, 3), Pd (4, 5) have been utilized as catalysts for the polymerization reaction of norbornene. It was found that the use of B(C 6 F 5 ) 3 /triethylaluminium (TEA) in comparison to methylaluminoxane as an activator towards complexes 2, 3 and 5 gave comparable polymerization activities, and the system 4/B(C 6 F 5 ) 3 /TEA even led to an extremely high polymerization activity of 10 7 g polymer /mol metal .h.
77 citations