Polyvinyl Fluoride PVF

PVF exhibits excellent resistance to weathering outstanding mechanical properties inertness toward a wide variety of chemicals, solvents, and staining agents excellent hydrolytic stability and high dielectric strength and dielectric constant [94], 

Films of polyvinyl fluoride retain their form and strength even when boiled in strong acids and bases. At ordinary temperatures, the film is not affected by many classes of common solvents, including hydrocarbon and chlorinated solvents. It is partially soluble in a few highly polar solvents above 149°C (300°F). It is impermeable to greases and oils [95]. 

Values of Refractive Index of Dyneon Fluoroplastics (Nominal Values, Not for Specification Purposes) 

Note HTE, terpolymer of hexafluoropropylene, tetrafluoroethylene, and ethylene THVP, 20306, THV, terpolymer of TEE, HEP, and VDE. Sources Dyneon Fluoroplastics, Product Comparison Guide, 99-0504-1501-1, Dyneon LLC, 2003 Dyneon Fluoroplastics, Product Comparison Guide, 5845HB 98-0504-1611-8, Dyneon LLC, 2007 (With permission). 

The linear macromolecule of polyvinyl fluoride (PVF) is based on the monomer unit [—CHj—CHF—] . PVF which is only used industrially as a thin film, exhibits good resistance to abrasion and resists staining. It also has outstanding weathering resistance and maintains useful properties from -100 to 150°C. 

Fluorinated polymers stand out sharply against other construction materials for their excellent corrosion resistance and high-temperature stability. In this respect they are not only superior to other plastics but also to platinum, gold, glass, enamel and special alloys. The fluorinated plastics used in process plants are polytetrafluorethylene (FIFE), fluorinated ethylene/ propylene (FEP), polytrifluoromonochlorethylene (PTFCE) and polyvinyl fluoride (PVF). They are much more expensive than other polymers and so are only economical in special situations [59]. 

PTFCE (or CTFC) can be applied as a porous-free coating where the highest corrosion resistance is required. 

PVF is a rigid plastic with corrosion resistance over a much wider range of conditions (it can be used with most chlorinated solvents up to 100°C) and temperature (-60° to 150°C). 

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Polyvinyl fluoride (PVF) (Tedlar) has the foliowing repeating unit ... 

Other polar groups also contribute toward relatively high critical surface tensions through formation of polar-polar secondary interactions. Thus although hdpe has a critical surface tension of 31 dyne/cm, PVC has a critical surface tension of 37 dyne/cm. In contrast, the critical surface tension of polyvinyl fluoride (PVF) is 28 dyne/cm. 

Polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF) cross-link upon irradiation, particularly with the use of prorads, such as TAG, TIAG, diallyl itaconate, ethylene bis-maleimide, and others. ... 

PVC, another widely used polymer for wire and cable insulation, crosslinks under irradiation in an inert atmosphere. When irradiated in air, scission predominates.To make cross-linking dominant, multifunctional monomers, such as trifunctional acrylates and methacrylates, must be added. Fluoropolymers, such as copol5miers of ethylene and tetrafluoroethylene (ETFE), or polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF), are widely used in wire and cable insulations. They are relatively easy to process and have excellent chemical and thermal resistance, but tend to creep, crack, and possess low mechanical stress at temperatures near their melting points. Radiation has been found to improve their mechanical properties and crack resistance. Ethylene propylene rubber (EPR) has also been used for wire and cable insulation. When blended with thermoplastic polyefins, such as low density polyethylene (LDPE), its processibility improves significantly. The typical addition of LDPE is 10%. Ethylene propylene copolymers and terpolymers with high PE content can be cross-linked by irradiation. ... 

Fluoropolymers, such as copolymer of ethylene and tetrafluoroethylene (ETFE), polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF), are widely used in wire and cable insulations. They are relatively easy to process and have excellent chemical and thermal resistance, but tend to creep, crack and possess low mechanical stress at temperatures near their melting points. Radiation has been found to improve their mechanical properties and crack resistance.36... 

Fluorinated ethylene propylene (FEP) Pol y tet raftuoroe th ylene (FTFE) Polyvinyl fluoride (PVF) Polyvinylidene fluoride (PVDF) lonomer Ketone... 

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. 

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],... 

Polytetrafluoroethylene (PTFE Teflon) was discovered accidently by PlunkettCZ nd commercialized by DuPont in the 1940 s. This polymer has a solubility parameter of about 6H and a high melting point of 327°C and is not readily moldable. Poly-chlorotrifluoroethylene (CTFE, Kel-F), the copolymer of tetrafluoroethylene and hexafluoropropylene (FEP), polyvinylidene fluoride (PVDF, Kynar), the copolymer of tetrafluoroethylene and ethylene (ETFE), the copolymer of vinylidene fluoride and hexafluoroisobutylene (CM-1), perfluoroalkoxyethylene (PFA) and polyvinyl fluoride (PVF, Tedlar) are all more readily processed than PTFE. However, the lubricity and chemical resistance of these fluoropolymers is less than that of PTFE. 

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. 

Partially fluorinated fluoropolymers with commercial significance include ethylene-tetrafluoro-ethylene copolymer (ETFE), ethylene-chlorotrifluo-roethylene copolymer (ECTFE), pol wnylidene fluoride (PVDF), and polyvinyl fluoride (PVF). The presence of hydrogen in these plastics lowers the fluorine content compared to perfluoropol5miers, and renders them susceptible to some chemicals. This means that care must be taken in the selection of these polymers to insure compatibility of process fluids. 

Certain pol5miers, such as pol5winylidene fluoride (PVDF) and polyvinyl fluoride (PVF), possess... 

The two pottant materials studied in this report are plasticized polyvinyl butyral (plPVB) which is easily available and used in safety glass, and a highly stabilized, peroxide crosslinked ethylene/vinyl acetate (EVA) copolymer containing about 33 weight % vinyl acetate (.7). The outer cover/insulator materials studied include polyvinyl fluoride (PVF) and a butyl aerylate/methyl methacrylate graft copolymer (BAgMMA) both are blown films. 

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