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: The ruthenium catalyst was found to be active enough to polymerize endo isomers of norbonene derivatives from the surface as well as to form diblock copolymer brushes.
Abstract: In this article, we report the formation of diblock copolymer brushes on a gold surface by surface-initiated, ring-opening metathesis polymerization (SI-ROMP) with the newly developed ruthenium catalyst [(H2IMes)(3-Br-py)2(Cl)2RuCHPh]. Taking advantage of the highly improved activity of the ruthenium catalyst and the rapid initiation step of ROMP, we successfully formed thin films of well-defined block copolymers with 5-norbornene-2-endo,3-endo-dimethanol and norbornene carboxylic acid methyl esters (44:56 endo/exo). The catalyst was found to be active enough to polymerize endo isomers of norbonene derivatives from the surface as well as to form diblock copolymer brushes. SI-ROMP of diblock copolymers from the surface was confirmed by ellipsometry, infrared spectroscopy, and X-ray photoelectron spectroscopy. After the formation, the polymer-grafted substrates were immersed in various solvents, and the selective swelling characteristics of polymer brushes were investigated by atomic force microscopy.
49 citations
TL;DR: In this paper, the rates of hydration of various alkenes, including propene, cyclohexene, 1-methylcyclohexenes and norbornene, were measured at 25/sup 0/C.
Abstract: The rates of hydration of ethylene, propene, 1-hexene, cyclohexene, 1-methylcyclohexene, 1-methylcyclopentene, and norbornene catalyzed by H/sub 2/SO/sub 4/ and D/sub 2/SO/sub 4/, and the hydration of cyclohexene catalyzed by HClO/sub 4/ and DClO/sub 4/, all at 25/sup 0/C, were measured. Ethylene is only a factor of 24 less reactive than p-nitrostyrene at H/sub 0/ = -7.37, but has a very steep slope of log k/sub obsd/ vs. H/sub 0/ of -1.54 so that ethylene rates extrapolated to low acidities appear quite small relative to other alkenes. All of the substrates are interpreted to react by rate-determining protonation on carbon to give the corresponding carbonium ions (the A/sub SE/2 mechanism). Solvent isotope effects k/sub H/sup +///k/sub D/sup +// range from 2.82 for propene to 1.06 for cyclohexene, and are only tenuously related to absolute reactivity. Norbornene is 770 times more reactive than cyclohexene, and at least part of this difference is attributed to the unsymmetrical ..pi.. bond in this molecule endowing it with enhanced nucleophilicity on the exo face.
49 citations
TL;DR: In this paper, a series of α-diimine ligands and their corresponding palladium complexes were synthesized and characterized, which could lead to metal complexes with very similar electronic and steric environments around a palladium center.
49 citations
TL;DR: In this paper, a catalyst system composed of [2-methyl-8-(diphenylphosphino)quinoline]nickel dichloride and MAO was used for the polymerization of polynorbornenes.
Abstract: Polymerization of norbornene has been promoted by a catalyst system composed of [2-methyl-8-(diphenylphosphino)quinoline]nickel dichloride and MAO. The catalytic system showed high activity (activity 8 g-PNB/mol-Ni h) for vinyl addition type polymerization. The resultant polynorbornenes possessed high molecular weight ( M w 6 g/mol) with wide molecular weight distribution ( M w / M n
49 citations
TL;DR: In this paper, a functionalized polynor-bornene consisting of a copolymer of decyl norbornenes and epoxide norbornene has been investigated as a low-temper-ature curing dielectric.
Abstract: The miniaturization of microelectronic de- vices has created a demand for new low-dielectric-constant materials to be used as insulating layers between metal interconnects. In this study, a functionalized polynor- bornene consisting of a copolymer of decyl norbornene and epoxide norbornene has been investigated as a low-temper- ature curing dielectric. Polynorbornenes possess properties that are attractive for microelectronics packaging; however, films of these polymers must be crosslinked in order to obtain the solvent resistance and low solvent swelling nec- essary for multilayer applications. Crosslinking of these ma- terials was achieved by acid-catalyzed cationic crosslinking of epoxide side groups. The reactions that occurred during higher temperature curing of epoxy functionalized nor- bornene films were studied using Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis. Epox- ide crosslinking and epoxide decomposition reactions were identified and studied as a function of temperature and time. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 568 -577, 2003
49 citations