24937-79-9 Usage
Description
Polyvinylidene fluoride (PVDF) is a semi-crystalline, non-centrosymmetric polymer that exhibits piezo-, pyro-, and ferroelectric properties. It is a linear polymer with permanent electric dipoles perpendicular to the direction of the molecular chain, resulting from the difference in electronegativity between the atoms of hydrogen and fluorine with respect to carbon. PVDF is known for its rigidity, abrasion resistance, and inherent flame retardancy. It is composed of repeating 1,1-difluoroethyl units and is available in two grades with differing average molecular weights, namely 300,000 and 600,000.
Uses
Used in Chemical Processing Industry:
Polyvinylidene fluoride is used as a protective coating for steel, tank linings, hose, and pump impellers due to its excellent resistance to stress fatigue, abrasion, and cold flow.
Used in Electrical and Electronic Equipment Industry:
PVDF is used as electrical insulation, piping, process equipment, and as a protective coating in the form of a liquid dispersion. It is also used to insulate wire and cable in computer and other electrical and electronic equipment.
Used in Coating and Film Industry:
Polyvinylidene fluoride is used in coatings, film, filter cloth, instrument linings, filtration membranes, pump parts, linings, and valves. It is also employed as a material for transducers in devices such as headphones, microphones, and sonic detectors.
Used in Piezoelectric and Electrostrictive Applications:
PVDF is used in piezoelectric and electrostrictive applications due to its unusual piezoelectric and pyroelectric properties.
Used in Fishing Industry:
Polyvinylidene fluoride is used as a monofilament fishing line, replacing nylon monofilament.
Used in Energy Storage Industry:
PVDF serves as a standard binder used in the production of composite electrodes for lithium-ion batteries.
Used in High-Performance Liquid Chromatography:
PVDF is utilized to make filters which are used to prepare samples for high-performance liquid chromatography and other advanced analytical techniques.
Used in Outdoor Service:
PVDF materials are used as a protective coating for metal panels used in outdoor service.
Used in Chemical Filtration Applications:
Woven cloth made from PVDF monofilament is used for chemical filtration applications.
Used in Piezoelectric Film Applications:
A recently developed capability of PVDF film is based on the unique piezoelectric characteristics of the film in its so-called beta phase. When compressed or stretched, polarized PVDF generates a voltage from one metallized surface to the other, proportional to the induced strain.
Production Methods
PVDF, the addition polymer of 1,1,difluoroethene, is prepared
by high-pressure free-radical polymerization in aqueous
systems. It has applications in electric and electronic
devices, as weather-resistant binders for exterior architectural
finishes, and in a number of areas of the chemicalprocessing
industry. The lack of additives and thus the
exceedingly low contamination levels make the polymer
useful in ultrapure water systems, for example, where high
purity is necessary for construction materials.
Production Methods
This product is made by the free-radical chain polymerization of vinylidene fluoride (H2C=F2). This odorless gas which has a boiling point of ?82 °C is produced by the thermal dehydrochlorination of 1,1,1-chlorodifluoroethane or by the dechlorination of 1,2-dichloro-1,1-difluoro-ethane.
Check Digit Verification of cas no
The CAS Registry Mumber 24937-79-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,4,9,3 and 7 respectively; the second part has 2 digits, 7 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 24937-79:
(7*2)+(6*4)+(5*9)+(4*3)+(3*7)+(2*7)+(1*9)=139
139 % 10 = 9
So 24937-79-9 is a valid CAS Registry Number.
InChI:InChI=1/C2H2F2/c1-2(3)4/h1H2
