Polychlorotrifluoroethylene PCTFE

Polychlorotrifluoroethylene (PCTFE) is a crystalline translucent sohd polymer with a high molecular weight ranging between 10 000 and 50 000 g mol , thus available as either viscous oil or hard plastic. It is made by polymerization of the bulk monomer or in solution, emulsion or dispersion by using free-radical starters, UV and y-radiation. The presence of the chlorine atom improves the attractive 

Polychlorotrifluoroethylene (PCTFE) consists of a linear macromolecule with the following monomer unit [—CF —CF(Cl)—PCTFE possesses outstanding barrier properties to gases. 

Electrostatic powder coating using fine powders and rotomolding and rotolining using very fine pellets are other processing methods. Formulated primers are used to improve adhesion and moisture permeability for powder-coated metal substrates. For rotolining, primers are usually not used [38]. 

Peak Notation Assignment of Main Peaks Molecular Weight Retention Index Relative Intensity 

2) Lonfei, J. Jingling, W, Shuman, X. J. Anal. Appl. Pyrolysis 1986,10, 99. 

medium note Cone. Temp. Time PDL Resistance note % Change % Retained Material note 

Model XW weatherometer, 21 3 44 84 Aclar 33C Allied Signal Specimen 0.025 mm 

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Figure 13.1. (a) Polychlorotrifluoroethylene (PCTFE). (b) Polytetrafluoreoethylene (PTFE). (c) Poly(vinyl fluoride), (d) Poly(vinylidene fluoride)... 

Polychlorotrifluoroethylene (PCTFE) is ordinarily prepared by emulsion polymerization. A polymer suitable for thermal processing requires coagulation, extensive washing, and postpolymerization workup. Coagulation to provide a filterable and washable solid is a slow, difficult process and removal of surfactant is an important part of it. Complete removal may be extremely difficult depending on the extent of adsorption to the polymer particles. Consequently we set out to develop a suspension polymerization process, which would be surfactant-free and afford an easily isolated product requiring a minimum of postreaction workup. 

The fluoropolymer family consists of polymers produced from alkenes in which one or more hydrogens have been replaced by fluorine. The most important members of this family are polytetrafluoroethylene (PTFE) (XLVII), polychlorotrifluoroethylene (PCTFE) (XLVIII), poly(vinyl fluoride) (PVF) (XLIX), poly(vinylidene fluoride) (PVDF) (L) copolymers of... 

Polychlorotrifluoroethylene (PCTFE), according to one source, degrades upon ionizing irradiation in a similar fashion as PTFE at ambient and elevated... 

The efficiency of the SCWO process for the destruction of EHMs was greater than 99.98%. Table 5 summarizes the data for EHM feed constituents, kerosene, polychlorotrifluoroethylene (PCTFE), trichloroethane (TCA), and photographic simulant. 

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. 

Polychlorotrifluoroethylene (PCTFE) has better mechanical properties than PTFE because the presence of the chlorine atom in the molecule promotes the attractive forces between molecular chains. It also exhibits greater hardness and tensile strength, and considerably higher resistance to cold flow than PTFE. Since the chlorine atom has a greater atomic radius than fluorine, it hinders the close packing possible in PTFE, which results in a lower melting point and reduced propensity of the polymer to crystallize [7]. The chlorine atom present in ethylene chlorotrifluoro-ethylene (ECTEE), a copolymer of ethylene and chlorotrifluoroethylene (CTEE), has a similar effect on the properties of the polymer. 

Polyvinylidene fluoride (PVDF) is considerably less thermally stable than PTFE but much more stable than polyvinyl fluoride (PVF) or polychlorotrifluoroethylene (PCTFE). Certain inorganic compounds (silica, titanium dioxide, and antimony oxide) can catalyze its decomposition at temperatures above 375°C (707°F) [10], ETFE degradation is autocatalytic and similar to that of PVDF and is accompanied by the evolution of hydrogen fluoride (HF). Iron and transition metal salts can accelerate the degradation of ETFE by dehydrofluorination and oligomer formation [10], Copper salts have been found to stabilize the polymer [11], ETFE decomposes rapidly at temperatures above 380°C (716°F) [11],... 

There are a number of other polymers in this family including polychlorotrifluoroethylene (PCTFE), polyvinyl fluoride (PVF), polyvinylidene fluoride, ethylene chlorotrifluoroethylene (ECTFE), tetrafluoroethylene/hexafluoropropylene/vi-nylidene fluoride terpolymers, and chlorotrifluo-roethylene/vinyl ether copolymers. 

Known in Germany since 1933, polytetrafluoro-ethylene (PTEE) is a semicrystalline resin (92-98% crystallinity), with T = 342°C and melt viscosity of 7 - 10 GPas. Others, more common fluoro-polymers are polychlorotrifluoroethylene (PCTFE), Hostaflon commercialized in 1934, fluorinated ethylene-propylene (FEP), Teflon -FEP introduced in 1972, and numerous copolymers with Tjjj = 260 to 304°C, processable at = 315 to 425°C, and having the degradation temperature, deg 440°C. The fluoropolymers are... 

Figure 13.17 Compressive stress-strain data for two crystalline polymers polytetrafluoroethylene (PTFE) and polychlorotrifluoroethylene (PCTFE). (From Kaufman, H.S. and Falcetta, J.J., Eds., Introduction to Polymer Science and Technology, John Wiley Sons, New York, 1977. With permission.)... 

Polychlorotrifluoroethylene (PCTFE) was the first fluorinated polymer to be produced on an experimental scale and was used in the United States early in World War II. It was also used in the handling of corrosive materials, such as uranium hexafluoride, during the development of the atomic bomb. 

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