Ethylene fluoroethylene

Chemical Designations - Synonyms Fluoroethylene, Monofluoro ethylene Chemical Formula CHj=CHF. 

A complete database of F-NMR information on 66 fluorinated etlianes and ethylenes of the formula CjHjjCl F is available on floppy disk through Project Seraphim [22]. Table 2 presents only (lie nine nonchlorinated fluoroethanes, and Table 3 presents the six nonchlorinated fluoroethylenes from this more extensive list. 

Our second example takes another member of the vinyl series, and considers the effect of replacing one of the hydrogens in ethylene with a fluorine. The fluoroethylene optimization converges at step 5. By looking at the optimized parameters for each job, we can compare the structures of the two molecules ... 

Let s compare the Mulliken population analysis for ethylene and fluoroethylene ... 

In initial tests to check the approach, sheet samples of thermoplastic ethylene tetra-fluoroethylene (ETFE) were used, with a permeation cup control test yielding a Q value of... 

Substituted ethylenes in which substituents occur on both carbon atoms (with the exception of the fluoroethylenes) usually are not prone to polymerize, although some of them, such as the maleates and fumar-ates, copolymerize readily with other monomers. The further fact that, with rare exceptions, the monomers unite through the addition of the substituted carbon atom of one unit to the unsubstituted carbon atom of the next permits representation of nearly all vinyl addition polymers by the general structural formula... 

Recently Stone has reported the addition of methyl- and phenylmanganese pentacarbonyl to highly fluorinated ethylene derivatives. For example, tetra-fluoroethylene reacted readily with methylmanganese pentacarbonyl at 90°C., or under ultraviolet light at room temperature, to produce 1,1,2,2-tetrafluoropropyl-manganese pentacarbonyl in high yield (103). 

Table 7 in Section 3, showed that the pre-exponential, 4-factor for the addition of alkyl radicals to olefins is of the order 10s 1 mol-1 s-1. Table 17 (p. 68) lists the relative Arrhenius parameters (taking ethylene as standard) for the addition of a wide range of halogenoalkyl radicals to fluoroethylenes. These tables correspond to the relative rate tables discussed in Section 5 in which the... 

In Table 5 (p. 55) we compared the relative rates of addition of methyl, fluoromethyl, difluoromethyl and trifluoromethyl radicals to ethylene and tetra-fluoroethylene. Figure 3 shows the Arrnehius plots for these competitive reactions. These indicate in a very graphic way the fact that this systematic variation in relative rate can be entirely attributed to variation in the activation energy differences. 

The family of FPs, also called fluorocarbon plastics, is based on polymers made of monomers composed of fluorine and carbon may also include chlorine atoms in their structure. Specific types include polytetrafluoroethylene (PTFE), polytetrafluoroethylene-cohexafluoro-propylene or fluorinated ethylene propylene (FEP), polytrafluoroethylene-coperfluoropropylvinyl ether (PFA), ethylenetetrafluoroethylene (ETFE). polychlorotrifluoroethylene (PCTFE), ethylene-chlorotri-fluoroethylene (ECTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), perfluoromethylvinylether (PFMV), perfluoroalkoxy (PFA), etc. 

NF3-01efin Systems. Mixtures of NF3 with ethylene and 1,1-di-fluoroethylene (as well as acetylene) were irradiated to see if addition across the olefinic double bond might occur or whether N—F groups might be incorporated into the molecule by some other means. The... 

We have also employed ETS to study the effect of fluorine substitution on the ir orbitals of benzene and ethylene (10). Here we briefly discuss the results for the fluoroethylenes. Fluorine substitution is known to cause only small shifts in tv ionization potentials (IP) of unsaturated hydrocarbons (1 1). For example, the vertical iv IP s of ethylene and perfluoroethylene agree to within 0.1 eV. The reason that has been most often forwarded to explain this is that the electron withdrawing inductive effect, which stabilizes the occupied orbitals, is nearly cancelled by the destabilizing resonance mixing of the fluorine p orbitals with the ir orbitals of the ethylenic double bond. 

Figure 2. Vertical singlet and triplet ir - ir excitation energies of ethylene and the fluoroethylenes as a function of (IP-EA) flOJ...

SYNS ETHENE, FLUORO- ETHYLENE, FLUORO-(8CI) FLUOROETHENE FLUOROETHYLENE MONOFLUOROETHYLENE VINYL FLUORIDE, inhibited pOT)... 

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