Propyl vinyl ether

Somewhat between PTFE and PFA materials is the product Hostaflon TFM, which is a copolymer of TFE and a small amount of the perfluoro(propyl vinyl ether). It has improved impact strength and weldability and has been promoted as a suitable material for forming into bottles. Yet another TFE-perfluoroalkoxy copolymer was introduced by Du Pont in 1979 as Teflon EPE. This material had a somewhat lower melting point (295 °C) than the more common PFA fluoropolymers but it is no longer marketed. 

PFA Tetrafluoroethylene-perfluoroalkyl (usually propyl) vinyl ether copolymers ... 

Tetrafluoroethylene-Perfluoro(propyl vinyl ether) Copolymers (PFA)... 

Copolymerizahon of TFE and perfluoro(propyl vinyl ether) (PPVE) yields melt-processable, linear polymers known as perfluoroalkoxy (PFA) resins of the following general structure... 

Systematic investigations on [(S)-l-methyl-propyl]-vinyl-ether and [(S)-2-methyl-butyl]-vinyl-ether have shown that the heterogeneous... 

The polymers have isotactic structure with helix conformations in the solid state (78) polymers of optically active and racemic (1-methyl-propyl)-vinyl-ether seem to have the same crystalline structure (Table 12). 

Poly-[(S)-l-methyl- propyl]-vinyl-ether Diethyl ethers ins., benzene soluble 171—177 3.4(17/5) 2.09... 

Table 14, Dependence of the optical activity at 250 C of poly-[(S)-1 -methyl-propyl]-vinyl-ether... 

PFA tetrafluoroethylene-pertluorof propyl vinyl ether) copolymers... 

Figure 9. Helix structure (a) side and end view of the chain of poly-m-methylstyrene (21) (b) side and end views of the macromolecule of isotactic crystalline poly-i-propyl vinyl ether (22)...

The selectivity of the Complex Formation is a very interesting subject, y - Cyclodextrin, (y - CD) has been found to form inclusion complexes with poly (methyl vinyl ether) (PMVE), poly(ethyl vinyl ether) (PEVE), and poly(n- propyl vinyl ether) (PnPVE) of various molecular weights to give stoichiometric compounds in crystalline states. However, a- cyclodextrin (a - CD) and (3 - Cyclodextrin ((3- CD) did not form complexes with poly (alkyl vinyl ether)s of any molecular weight, y -CD did not form complexes with the low molecular weight analogs, such as diethyl ether and trimethylene glycol dimethyl ether. 

A vinyl ether with a mesogenic side group, 3-[4-cyano-4 -biphenyl)oxy]propyl vinyl ether, was polymerized at 0 °C in CH2C12 with trifluoromethanesulfonic acid as an initiator in the presence of dimethylsulfide [92]. 

Recently, Wada et al. [175,176] have observed an excellent enantioselectivity for the intermolecular hetero Diels-Alder reactions of ( )-2-oxo-l-phenylsul-fonyl-3-alkenes 2-197 - 2-199 with enol ethers 2-200 to give the dihydropyrans 2-201 - 2-203 using the Narasaka catalyst 2-204. The best results were obtained with the iso-propyl vinyl ether 2-200c (Fig. 2-56). 

Recently, we found that a new class of solid acid catalyst, a Nafion resin/silica nanocomposite effectively catalyzes the Pechmann reaction (65). Nafion resin is a tetrafluoroethylene and perfluoro-2-(fluorosulfonylethoxy)propyl vinyl ether copolymer and can be made more suitable for organic catalysis. In the novel nanocomposites of Nafion resin, the nanometer-sized Nafion particles are entrapped within a porous silica matrix. These materials combine the excellent solid-acid... 

Perfluoro terpolymers consisting of tetrafluoroethylene, perfluoro(ethyl vinyl ether), and perfluoro(propyl vinyl ether) have been free radically prepared to have distinguished transparency and good mechanical strength at both ambient temperature and 372°C. These materials are particularly useful as high-strength moldings. 

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