The vibrational spectra of norbornene and nadic anhydride

Parker, Stewart F.; Williams, K. P. J.; Steele, D.; Herman, H.

doi:10.1039/b211967f

Cited by 12 publications

(8 citation statements)

References 15 publications

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“…In agreement with this observation, no molecular-ion peak due to monomeric 1 was detected by MALDI-TOF mass spectrometry of the filtrate (Figure S1) . Compared with the intact nanocoils before ROMP, the isolated product in the infrared spectroscopy displayed a large drop in intensity of a vibrational band at 1335 cm -1 (Figure a), characteristic of norbornene (C−H out-of-phase in-plane bending mode) . The relative integral value of this band suggested roughly 80% conversion of the cyclo-olefinic double bond into an acyclic one .…”

Section: Resultsmentioning

confidence: 99%

Stabilization of a Kinetically Favored Nanostructure: Surface ROMP of Self-Assembled Conductive Nanocoils from a Norbornene-Appended Hexa-peri-hexabenzocoronene

et al. 2006

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Newly designed norbornene-appended hexabenzocoronene 1 self-assembles, upon diffusion of an Et(2)O vapor into its CH(2)Cl(2) solution, to form either graphitic nanocoils or nanotubes, depending on the self-assembling conditions. The coiled assembly, selectively formed at 15 degrees C, is a kinetic intermediate for the tubular assembly and transforms into nanotubes on standing at 25 degrees 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 x 10(-)(4) S cm(-)(1) upon doping with I(2), while the nonpolymerized nanocoils are disrupted upon being doped.

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Section: Resultsmentioning

confidence: 99%

Stabilization of a Kinetically Favored Nanostructure: Surface ROMP of Self-Assembled Conductive Nanocoils from a Norbornene-Appended Hexa-peri-hexabenzocoronene

et al. 2006

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“…The peak at 484 cm -1 is assigned to DCPD molecular torsion while the peak at 974 cm -1 is associated with trans C=C-H out-ofplane stretching. (47)(48) (b) The 800 to 450 cm -1 region of the FTIR spectra is highlighted showing the development of shoulders and broadening of the peaks located around 775 to 700 cm -1 that occur during reaction (due to new cis creation and peak shifting). Various kinetics models were applied to the data obtained from curing DCPD at 30 C ( Figure 6).…”

Section: Pure Dcpd Curing Kineticsmentioning

confidence: 99%

Concurrent curing kinetics of an anhydride-cured epoxy resin and polydicyclopentadiene

Rohde

Robertson

Krishnamoorti

2015

Polymer

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The development of interpenetrating polymer networks provides a route to create tough materials that maintain high strength and stiffness, suitable for meeting the demands of an offshore wind turbine environment. This work has focused on a system composed of diglycidyl ether of bisphenol A (DGEBA)-based epoxy resin, contributing high tensile strength and modulus, and polydicyclopentadiene (polyDCPD), which has a higher toughness and impact strength as compared to other thermoset polymers. In situ Fourier transform infrared spectroscopy was used to explore the reaction kinetics in neat, diluted and sequentially cured mixtures of epoxy resin and polyDCPD. There were significant differences in the rate of network formation in the two neat systems, as the rate of anhydride curing of the epoxy was extremely slow at the temperatures required for reasonably measurable dicyclopentadiene (DCPD) ring-opening metathesis polymerization. The dissimilar kinetics of these two systems were leveraged in the design of a sequential curing protocol in which the DCPD was first cured in the presence of the epoxy resin components, followed by curing of the epoxy resin at an elevated temperature. The curing kinetics of the macroscopically phase separated domains of the epoxy resin components in the presence of the polyDCPD network behaved as expected for a diluted epoxy resin. These results provide the kinetic basis for future studies to prepare interpenetrating polymer networks which employ thermodynamic control of phase separation such as through the addition of compatibilizing molecules.

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“…Thus, it is especially useful in organic reactions when their mechanisms involve polar species, such as SN 2 reactions. 3 Therefore, DMF is mostly used as an excellent polar solvent with a relatively low evaporation rate, useful for a wide variety of organic transformations. Its Majid M. Heravi was born in 1952 in Mashhad, Iran.…”

Section: Introductionmentioning

confidence: 99%

Beyond a solvent: triple roles of dimethylformamide in organic chemistry

2018

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N,N-Dimethylformamide (DMF) is frequently used as an aprotic solvent in chemical transformations in laboratories of academia as well as in those of chemical industry. In the present review, we will reveal that DMF is actually something much more than a solvent. It is a unique chemical since, as well as being an effective polar aprotic solvent, it can play three other important roles in organic chemistry. It can be used as a reagent, a catalyst, and a stabilizer.

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The vibrational spectra of norbornene and nadic anhydride

Cited by 12 publications

References 15 publications

Stabilization of a Kinetically Favored Nanostructure: Surface ROMP of Self-Assembled Conductive Nanocoils from a Norbornene-Appended Hexa-peri-hexabenzocoronene

Stabilization of a Kinetically Favored Nanostructure: Surface ROMP of Self-Assembled Conductive Nanocoils from a Norbornene-Appended Hexa-peri-hexabenzocoronene

Concurrent curing kinetics of an anhydride-cured epoxy resin and polydicyclopentadiene

Beyond a solvent: triple roles of dimethylformamide in organic chemistry

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