Ethylene-chlorotrifluoroethylene copolymer properties

Its properties resemble those of ethylene-chlorotrifluoroethylene copolymer. 

Fluoropolymers. Melt processable fluoropolymers such as Teflon FEP, Tefzel ETFE, poly(vinylidene fluoride) (Kynar), and ethylene-chlorotrifluoroethylene copolymer (Halar) are suitable for wire insulation in special applications because they combine good physical properties with low flammability. They are used for instrumentation cable in process-control rooms, as well as for computer and aircraft wiring and in military applications. The... 

Ethylene chlorotrifluoroethylene copolymer (ECTFE, E/CTFE) n. A fluoroplastic with good mechanical, thermal, electrical, processing, and resistance properties. 

Ethylene-chlorotrifluoroethylene copolymer (ECTFE) has a linear macromolecule in which the predominant alternating copolymer is [—(CHJj-CFj—CFCl—] . This copolymer exhibits useful properties for a wide range of temperatures, that is, from cryogenic temperatures up to 180 C. Its permittivity is low but stable over a broad temperature and frequency range. 

Ethylene carbonate, 10 640, 665 in lithium cells, 3 459 molecular formula, 6 305t physical properties, 6 306t transesterification of, 13 651-652 Ethylene-carbon monoxide (ethylene-CO) copolymers, 5 9 10 197 Ethylene chlorohydrin process, 10 640 Ethylene-chlorotrifluoroethylene (E-CTFE) alternating copolymer (ECTFE), 15 248... 

Ethylene-tetrafluoroethylene copolymer (ETFE) is a linear macromolecule with the monomer unit [—(CHjlj—(CF l —] . ETFE exhibits physical properties similar to those of ethyl-ene-chlorotrifluoroethylene copolymer. 

Ethylene chlorotrifluoroethylene (ECTFE) is an alternating copolymer of chlorotrifluoroethylene and ethylene. It has better wear properties than PTFE along with good flame resistance. Applications include wire and cable jackets, tank linings, chemical process valve and pump components, and corrosion-resistant coatings. ... 

The most chemical-resistant plastic commercially available today is tetrafluoroethylene or TFE (Teflon). This thermoplastic is practically unaffected by all alkahes and acids except fluorine and chlorine gas at elevated temperatures and molten metals. It retains its properties up to 260°C (500°F). Chlorotrifluoroethylene or CTFE (Kel-F, Plaskon) also possesses excellent corrosion resistance to almost all acids and alkalies up to 180°C (350°F). A Teflon derivative has been developed from the copolymerization of tetrafluoroethylene and hexafluoropropylene. This resin, FEP, has similar properties to TFE except that it is not recommended for continuous exposures at temperatures above 200°C (400°F). Also, FEP can be extruded on conventional extrusion equipment, while TFE parts must be made by comphcated powder-metallurgy techniques. Another version is poly-vinylidene fluoride, or PVF2 (Kynar), which has excellent resistance to alkahes and acids to 150°C (300°F). It can be extruded. A more recent development is a copolymer of CTFE and ethylene (Halar). This material has excellent resistance to strong inorganic acids, bases, and salts up to 150°C. It also can be extruded. 

Copolymers of chlorotrifluoroethylene and ethylene were introduced by Allied Chemicals under the trade name Halar in the early 1970s. This is essentially a 1 1 alternating copolymer compounded with stabilising additives. The polymer has mechanical properties more like those of nylon than of typical fluoroplastic, with low creep and very good impact strength. Furthermore the polymers have very good chemical resistance and electrical insulation properties and are resistant to burning. They may be injection moulded or formed into fibres. 

A copolymer of ethylene and chlorotrifluoroethylene is mixed with 0.5 to 2 wt.% of boron nitride, the blend obtained is extruded at 260 to 300C, nitrogen is injected into the blend at 50 to 150 atmospheres and the pressure is lowered to produce the expanded article, which has high dielectric properties. 

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. 

In this chapter the solid state extrusion of different grades of polyethylene is discussed. The term copolyethylene stands as well for short and long branched PE as for the nearly alternating 1 1 copolymer poly(ethylene-co-chlorotrifluoroethylene) (PECTFE). It is well known that even HOPE contains a certain amount of short branches. Therefore, it is of interest to note that already one butyl side group per thousand main chain carbom atoms effects the solid state extrusion properties of PE remarkably. 

Thermoplastic comprised of an alternating copolymer of ethylene and chlorotrifluoroethylene. It has good impact resistance and good abrasion resistance, chemical resistance, weatherability, and electrical properties. It can be molded, extruded, and powder-coated with uses in tubing, cable and wire insulation, valves, pump parts, wraps, and tower packing and chemical equipment applications. 

In semicrystalline dipole electrets, polar crystallites are present in addition to the polar amorphous phase (Fig. 2b). In die technically most interesting semicrystalline dipole electrets such as polyvinyhdene fluoride (PVDF) and its copolymers with trifluoro ethylene (P(VDF-TrFE)) (Lovinger 1983) or hexafluoropropylene (P(VDF-HFP)), odd Nylons 7 and 11, polyureas, polyureflianes (PU), and some liquid crystalline polymers, the crystallites are ferroelectric (Vasudevan et al. 1979 Hattori et al. 1996). The terpolymer poly(vinyhdene-fluoride-trifluoroethylene— chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) has been shown to have relaxor ferroelectric properties as the CTFE group destabilizes die long-range order of the ferroelectric phase (Xu et al. 2001). 

The unit cell of alternating copolymers of ECTFE is hexagonal with a chain repeat distance of 0.502 mn.[57][58] pjjg (.gp contains three molecules and occupies a volume of 0.324 nm. f l The preferred morphology of ECTFE chains is similar to that of ETFE where chlorotrifluoroethylene units line up opposite ethylene in the adjacent chain. This structure has been credited for the relatively high melting point and physical properties of equimolar ECTFE. 

Chlorotrifluoroethylene-ethylene copolymers (ECTFE) contain about 50 mole % chlorotrifluoroethylene. These copolymers are generally similar to the tetrafluoroethylene-ethylene copolymers (section 7.9) in that they are melt-processable and have high impact strength and good chemical resistance. Comparative values for some properties are given in Table 7.1. The temperature range of useful performance is from about — 80°C to 170°C. Chlorotrifluoroethylene-ethylene copolymers find use in injection mouldings for chemical process equipment and cable insulation. 

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