Trifluoroethylene thermal

Less common in practice is poly(trifluoroethylene). Poly(trifluoroethylene) behaves during thermal decomposition similarly to poly(vinylidene fluoride). A study on thermal decomposition of this polymer between 380° C and 800° C showed the formation of high yields of HF and of some nonvolatile products [42]. 

A copolymer of vinylidene fluoride-trifluoroethylene (VDF/TrFE) copolymer is well known as the polymer for which a clear Curie point was found for the first time in an organic material. At this Curie point, the polymer undergoes a solid-to-solid phase transition from paraelectric to ferroelectric phases with decreasing temperature. Therefore, the changes in the physical properties such as crystal structure, electrical and thermal properties upon the ferroelectric phase transition have drawn many researchers interest. Here, the results concerning the ultrasomc spectroscopic mvestigation on acoustic and viscoelastic behaviour around the ferroelectric phase transition region of this copolymer are described [15]... 

Thermogravimetric analysis of polyvinylidene-co-trifluoroethylene layered nanocomposites have indicated that their thermal stability is improved when the anionically modified layered silicate content was increased [30]. Differential scanning calorimetry showed that thermal transitions in the nanocomposites depended on the layered silicate content. 

Thermal diffusivity measurements have been reported for fibre reinforced phenol-formaldehyde resins [31], PA 6,6, PP, PMMA [54] and trifluoroethylene nanocomposites [55]. 

Gebe and Runt [47] studied the effects of organically modified layered silicates, such as trioctyl methyl ammonium-modified smetite clays or octadecyl ammonium-modified silicate, on the thermal properties of a 75% polyvinylidene fluoride-co-trifluoroethylene random copolymer. 

In the addition to homo-PVF2, a large number of copolymers have also been synthesized which allow to optimize the mechanical properties of fluoropolymers. Most common are copolymers with vinyl fluoride, trifluoroethylene, tetrafluoroethylene, hexafiuoropropy-lene, hexafluoroisobutylene, chlorotrifluoroethylene, and pentafiuoro-propene [521,535, 559-562]. Copolymerization with nonfluorinated monomers is possible [563] in principle but has not yet found commercial use. Fluorocarbon monomers that can help to retain or enhance the desirable thermal, chemical, and mechanical properties of the vinylidene structure are more interesting comonomers. Copolymerization with hexafluoropropylene, pentafluoropropylene, and chlorotrifluoroethylene results in elastomeric copolymers [564]. The polymerization conditions are similar to those of homopoly(vinylidene fluoride) [564]. The copolymers have been well characterized by x-ray analysis [535], DSC measurements [565], and NMR spectroscopy [565,566]. 

Re-investigation of the thermally-initiated addition reactions between trifluoroiodomethane and vinyl fluoride and propene has shown that at 200 °C both olefins yield a mixture of 1 1 adducts, but in each case the major isomer is derived from trifluoromethyl radical attack on the CH, group. Bi-directional addition was also observed in thermal reactions between trifluoroiodomethane and trifluoroethylene and hexafluoropropene, the product isomer ratios following closely those found in u.v.-initiated reactions."... 

Free-radical Reactions.— Publications have appeared dealing with the results of kinetic studies on the following gas-phase reactions photoaddition of hydrogen bromide to tetrafluoroethylene, trifluoroethylene, cis- and trans-1,2-difiuoroethylene, and vinyl fluoride the thermal reaction of tetra-fiuoroethylene with hydrogen iodide to yield mainly 1,1,2,2-tetrafluoroethane and iodine photoaddition of perfluoro-n-propyl iodide to trifluoroethylene, vinylidene fluoride, and vinyl fluoride photochlorination of perfluoro-... 

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