Polyvinyl fluoride

Polyvinyl fluoride, like FVC and polyvinylidene fluoride, also tends to cleave hydrogen halide [599]. 

Bruch and co-workers [56] studied a commercial sample and also a laboratory-prepared sample containing no monomer reversals. Broadband proton-decoupled 

For detecting the resonances of hydrogen atoms in chain ends and near branch points, the differential selective fluorine irradiation experiment was used to link the two spectra via Ff-F couplings  

Penetrant water vapor oxygen nitrogen carbon dioxide 

Du Pont has three types of Tedlar film, Type A, with one side treated for bonding Type B, with both sides bondable and Type S, which is untreated and is used as a release film (www2.dupont.com). Type B is used in laminating to metals, plastics, wood, and other materials it requires no further surface preparation for adhesive bonding. The methods for preparing the untreated film for adhesive bonding are similar to those of polyolefins and lluoropolymers (see Chapter 6). 

The copolymer SAN (Ty ril —Dow Chemical Co.) is usually solvent cemented with solvents similar to those used for PS, although effective solvents are more limited. In applications where solvent cements cannot be used, as in bonding to metals, the procedures suggested for PS may be used. TCE and gasoline have also been used, with no further treatment.  

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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 (PTFE), fluorinated ethylene/ propylene (FEP), polytrifiuoromonochlorethylene (PTFCE) and polyvinyl fluoride (PVF). They are much more expensive than other polymers and so are only economical in special situations [59]. 

Other fluorine-containing plastics These materials, in general, attempt to compromise between the exceptional end-use properties of p.t.f.e. and the processability of ordinary thermoplastics. Examples include polychlor-trifluorethylene, tetrafluorethylene-hexafluorpropylene copolymers (FEP resins) and polyvinylidene fluoride. Polyvinyl fluoride is available in film form (Tedlar) with excellent weathering resistance. 

Polyethylene Polypropylene Polytetrafluoroethylene Polyvinyl chloride Polyvinyl fluoride Polystyrene... 

Figures 7.8(a) and (b) display piloted ignition results for a metalized polyvinyl fluoride (MPVF) film of 0.2 mm thickness over a 25 mm fiberglass batting [14]. The MPVF film was bonded to a shear glass scrim (with no adhesive or significant thickness increase) to prevent it from stretching and ripping. The unbounded MPVF film was also tested. This shows several features that confirm the theory and also indicate issues.

Many vinyl monomers were reported to have been grafted onto fluoropolymers, such as (meth)acrylic acid and (meth)acrylates, acrylamide, acrylonitryl, styrene, 4-vinyl pyridine, N-vinyl pyrrolidone, and vinyl acetate. Many fluoropolymers have been used as supports, such as PTFE, copolymers of TFE with HFP, PFAVE, VDF and ethylene, PCTFE, PVDF, polyvinyl fluoride, copolymers ofVDF with HFP, vinyl fluoride and chlorotrifluoroethylene (CTFE). The source of irradiation has been primarily y-rays and electron beams. The grafting can be carried out under either direct irradiation or through the use of preliminary irradiated fluoropolymers. Ordinary radical inhibitors can be added to the reaction mixture to avoid homopolymerization of functional monomers. 

A Tedlar bag, made of polyvinyl fluoride, was used. These bags were purchased from SKC, Inc. (US). 

Polyvinyl Fluoride. See Vinylfluoride Polymer in this Section... 

Polyvinyl fluoride and PVDF are more stable to elevated temperatures than the corresponding chloride polymers. The decomposition temperatures of polytrifluoroethylene and polytetrafluoroethylene (ptfe) are progressively higher than polymers of vinyl fluoride or vinylidene fluoride. The pyrolysis of PAN and polymethacrylonitrile yields polycyclic ladder polymers. 

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. 

PVF PVP Q R Polyvinyl formal Polyvinyl fluoride Polyvinyl pyrrolidone Charge (electric) Heat flow Universal gas constant Stress relaxation modulus Weight change per day Resistance... 

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. ... 

Heat-shrinkable tubing is made typically from polyolefins, PVC, polyvinyl fluoride, PTFE, their blends, or blends with other plastics and elastomers. The formulations may be designed for chemical resistance, heat resistance, flame resistance, etc. ... 

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... 

Piezoelectric effect in oriented polyvinyl chloride and polyvinyl fluoride. 

The vinyl fluoride/vinylidene fluoride and the vinyl fluoride/tetra-fluoro ethylene copolymer systems were also studied (21). In the first case isomorphism is observed in the whole range of compositions, while the distribution of the two types of units is random. The crystal structure is that of polyvinyl fluoride, which is virtually identical with one of the three known crystalline forms of polyvinylidene fluoride, and characterized by a planar zig-zag chain conformation. High degrees of crystallinities in the whole range of compositions are also observed in the second case. However, the crystal structure of the two pure homopolymers is not the same hence we are in the presence of isodimorphism. In any case, for vinyl fluoride contents ranging between 0 and 75 mole-% the structure observed is essentially that of polytetrafluoro ethylene in the crystalline... 

More recently, the crystal structure of atactic polyvinyl fluoride, which is highly crystalline under ordinary conditions, was reported (49) here the atoms replacing each other randomly are hydrogen and fluorine, whose van der Waals radii are also similar ( 1.25 and 1.35 A respectively (48)). 

PC PE PES PET PF PFA PI PMMA PP PPO PS PSO PTFE PTMT PU PVA PVAC PVC PVDC PVDF PVF TFE SAN SI TP TPX UF UHMWPE UPVC Polycarbonate Polyethylene Polyether sulfone Polyethylene terephthalate Phenol-formaldehyde Polyfluoro alkoxy Polyimide Polymethyl methacrylate Polypropylene Polyphenylene oxide Polystyrene Polysulfone Polytetrafluoroethylene Polytetramethylene terephthalate (thermoplastic polyester) Polyurethane Polyvinyl alcohol Polyvinyl acetate Polyvinyl chloride Polyvinyl idene chloride Polyvinylidene fluoride Polyvinyl fluoride Polytelrafluoroethylene Styrene-acrylonitrile Silicone Thermoplastic Elastomers Polymethylpentene Urea formaldehyde Ultrahigh-molecular-weight polyethylene Unplasticized polyvinyl chloride... 

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