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Poly(tetrafluoroethylene)

Basic information Description References Safety Related Supplier

Poly(tetrafluoroethylene) Basic information

Product Name:
Poly(tetrafluoroethylene)
CAS:
9002-84-0
MF:
(C2F4)n
MW:
0
EINECS:
618-337-2
Mol File:
9002-84-0.mol
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Poly(tetrafluoroethylene) Chemical Properties

Melting point:
327 °C
Boiling point:
400 °C
Density 
2.15 g/mL at 25 °C
refractive index 
1.35
solubility 
Solubility in water:
form 
powder
Specific Gravity
2
color 
white
Water Solubility 
Insoluble in water. Soluble in perfluoro kerosene.
Merck 
14,7562
Stability:
Stable - unreactive with most materials. Incompatible with molten alkali metals, fluorine and other halogens, strong oxidizing agents.
NIST Chemistry Reference
Polytetrafluoroethylene, annealed(9002-84-0)
EPA Substance Registry System
Polytetrafluoroethylene (9002-84-0)
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Safety Information

Hazard Codes 
Xi,T,Xn
Risk Statements 
41-36/38-45-48/20
Safety Statements 
26-39-24/25-45-22-53-23
WGK Germany 
3
RTECS 
KX4025000
Hazard Note 
Irritant
TSCA 
Yes
HS Code 
39046100
Hazardous Substances Data
9002-84-0(Hazardous Substances Data)

MSDS

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Poly(tetrafluoroethylene) Usage And Synthesis

Description

Poly-(Tetrafluoroethylene) (PTFE, Brand name: Teflon, Fluon, Hostaflon, and Polyflon) is a kind of strong, tough, waxy and nonflammable synthetic resin. Its structure formula is [CF2-CF2]n with a carbon backbone chain. It is produced through the free-radical polymerization of tetrafluoroethylene. PTFE has slippery surface, high melting point, and is extremely chemically inert. This property make it have a lot of applications. Its biggest application is for the wiring in aerospace and computer applications due to its excellent dielectric properties, e.g. as the insulator in cables and connector. In industry, PTFE can be applied in places where sliding action of parts is required due to its low friction such as plain bearings, gears and slide plates. PTFE is also applied in the production of carbon fiber composites and fiberglass composites. In addition, owing to its chemical inertia and high thermal resistance, PTFE is applied in places where acids, alkalis or other chemical are used, e.g. as the liner in industrial pipe lines.

References

http://pslc.ws/macrog/ptfe.htm
https://global.britannica.com/science/polytetrafluoroethylene
https://en.wikipedia.org/wiki/Polytetrafluoroethylene#Other

Description

Tetrafl uoroethylene (TFE), also known as perfl uoroethylene, is a colorless, fl ammable, toxic gas. It is the monomer used for polytetrafl uoroethylene (PTFE), which is sold under the DuPont tradename of Tefl on. TFE is co-polymerized with other compounds to produce a variety of Tefl ons. TFE is produced by heating chlorodifl uoromethane (CHClF2, Freon-22) or trifl uoromethane (CHF3, Freon-23). TFE is used almost exclusively as a monomer in the production of PTFE. PTFE is a vinyl polymer, which means it is made from a monomer with carbon-carbon double bonds. PTFE is made from TFE by free radical polymerization.
PTFE’s unique physical properties are due to its chemical structure. PTFE consists of long chains of carbon atoms surrounded by fluorine atoms. The fluorine atoms act as a protective barrier that shields the carbon-carbon bond from chemical attack. The fluorine atoms repel other atoms, making it diffi cult for anything to stick to PTFE. PTFE resins have very low coeffi cients of friction (< 0.1). The strong fluorine-to-carbon bonds and high electronegativity of fluorine make PTFE very stable. The long chains of PTFE pack closely together to give a dense crystalline solid. The packing, which can be compared to stacking boards, produces little cross-linking.

Chemical Properties

white powder, or white solid with a slippery feel

History

The polymerized form of TFE was discovered accidentally by researchers at DuPont in 1938. During the mid-1930s, DuPont was investigating the development of new chlorofl uorocarbons (CFCs) for use as refrigerants. DuPont joined with General Motors to form a company called Kinetic Chemicals to combine their efforts in this area. Plunkett examined the properties of the substance. He discovered that the substance was inert to other chemicals, had a high melting point, and was very slippery. Plunkett also worked on duplicating the conditions necessary to produce it from TFE. He applied for a patent for polytetrafl uoroethylene polymers in 1939, which was granted in 1941 (U.S. Patent 2230654). He assigned the patent to Kinetic Chemicals. DuPont registered the term Tefl on in 1945 and introduced Tefl on products the next year.
Teflon is best known for its use in cookware, but its use in this area followed original industrial applications in gaskets, sealers, tape, and electrical insulation. Th ese applications were a direct result of the use of PTFE for military purposes during World War II.

Uses

Poly(tetrafluoroethylene) is used in hundreds of applications in addition to cookware. Poly(tetrafluoroethylene) is used in inks, plastics, coatings, and lubricants.Poly(tetrafluoroethylene) can be molded into gaskets, seals, bearings, gears, and other machine parts. Poly(tetrafluoroethylene) is used as liners, insulation, membranes, and adhesives. Tefl on tape is commonly used in plumbing work. Poly(tetrafluoroethylene)  is used to produce rainproof garments.

Uses

Inert lubricant.

Uses

polytetrafluoroethylene powder be used for plastic modification, average particle size is about 3-5 and 10-20 micrometer, PTFE has excellent performance, it has unique properties, including, no self-coagulation, no electrostatic effect, good intermiscibility, low molecular weight, good dispersion, high self-lubrication, low friction coefficient, etc.

Uses

For hookup and hookup-type wire in electronic equipment; in computer wire, electrical tape, electrical components, spaghetti tubing. Seals and piston rings, basic shapes, bearings, mechanical tapes, coated glass fabrics. As tubing and sheets for chemical laboratory and process work; for lining reaction vessels; for gaskets and pump packings, sometimes mixed with graphite or glass fibers; as electrical insulator especially in high frequency applications; filtration fabrics; protective clothing. Prosthetic aid.

Uses

PTFE (polytetrafluoroethylene) is a bulking agent, it is also used in cosmetic preparations to improve the formulation’s feel and spreadability. PTFe may also have some waterproofing potential.

Definition

A synthetic polymer made from tetrafluoroethene (i.e. CF2:CF2). It is able to withstand high temperatures without decomposing and also has a very low coefficient of friction, hence its use in non-stick pans, bearings, etc.

Definition

ChEBI: A polymer composed of repeating tetrafluoroethyl groups.

Production Methods

Polytetrafluoroethylene is generally made from tetrafluoroethylene gas by free-radical polymerization under pressure with oxygen, peroxides, or peroxydisulfates. The “granular resins” have medium-size particles that range from 30 to 600 mm. Colloidal aqueous dispersions, made by a different process, are concentrated to about 60% by weight of the polymer and have particles that average about 0.2 mm. Coagulated dispersions with agglomerates that average 450mm are also available .
The use of PTFE as a release agent in coatings and certain other food contact applications is permitted under FDA regulations .

Hazard

Evolves toxic fumes on heating. Question- able carcinogen.

Industrial uses

The polymer is insoluble, resistant to heat (upto 275°C) and chemical attack, and, in addition,has the lowest coefficient of friction of any solid.Because of its resistance to heat, the fabricationof polytetrafluoroethylene requires modificationof conventional methods. After molding thepowdered polymer using a cold press, the moldingsare sintered at 360 to 400°C by proceduressimilar to those used in powder metallurgy. Thesintered product can be machined or punched.Extrusion is possible if the powder is compoundedwith a lubricating material. Aqueoussuspensions of the polymer can also be used forcoating various articles. However, special surfacetreatments are required to ensure adhesionbecause polytetrafluoroethylene does not adherewell to anything.
Polytetrafluoroethylene (TFE resin) is usefulfor applications under extreme conditions ofheat and chemical activity. Polytetrafluoroethylenebearings, valve seats, packings, gaskets,coatings, and tubing can withstand relativelysevere conditions. Fillers such as carbon, inorganicfibers, and metal powders may be incorporatedto modify the mechanical and thermalproperties.
Because of its excellent electrical properties,polytetrafluoroethylene is useful when adielectric material is required for service at ahigh temperature. The nonadhesive quality isoften turned to advantage in the use of polytetrafluoroethyleneto coat articles such as rollsand cookware to which materials might otherwiseadhere.

Safety Profile

The finished polymerized compound is inert under ordinary condtions. There have been reports of “polymer fume fever” in humansexposed to pyrolysis products, whch also are irritants. Smohng should be prohibited in areas where ths material is being fabricated or, in general, where there may be dust from it. Exposure to pyrolysis or decomposition products appears to be the chief health-related problem. Questionable carcinogen with experimental tumorigenic data by implant. Incompatible with fluorine, sodmm potassium alloy. Under the proper conditions it undergoes hazardous reactions with boron, magnesium, or titanium. When heated to above 750°F it decomposes to yield highly toxic fumes of F-.

Carcinogenicity

Animal studies have not demonstrated that this polymer is carcinogenic. No data are available in humans. The polymer is not classifiable as to its human carcinogenicity. However, the EPA found that perfluorooctanoic acid (PFOA), a chemical used to produce PTEE is a “likely carcinogen.

Poly(tetrafluoroethylene) Preparation Products And Raw materials

Raw materials

Preparation Products

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Poly(tetrafluoroethylene)SupplierMore

Sigma-Aldrich Gold
Tel:
021-61415566
Email:
orderCN@merckgroup.com;orderCN@merckgroup.com
Products Intro:
Product Name:Polytetrafluoroethylene preparation 60 wt % dispersion in H2O
CAS:9002-84-0
Purity:NULL Package:500ML Remarks:665800
Shanghai Aladdin Bio-Chem Technology Co.,LTD Gold
Tel:
021-20337333/400-620-6333
Email:
sale@aladdin-e.com
Products Intro:
Product Name:Polytetrafluoroethylene preparation
CAS:9002-84-0
Package:849.5RMB/2.5KG
Shanghai SMEC Trading Co., Ltd. Gold
Tel:
021-68640333
Email:
yuanqi@shanghaismec.com
Products Intro:
Product Name:POLYTETRAFLUOROETHYLENE PREPARATION;PTFE;CHROMOSORB T
CAS:9002-84-0
Purity:99% Package:25KG/drum
Chengdu Yuanda chemical co.,ltd Gold
Tel:
028-85356300-
Email:
chenquanxing@126.com
Products Intro:
Product Name:poly(tetrafluoroethylene) fine powder; PTFE fine powder; PTFE micro powder
CAS:9002-84-0
Purity:99.99% Package:1KG,2KG,5KG,25KG
J & K SCIENTIFIC LTD.
Tel:
010-82848833- ;010-82848833-
Email:
jkinfo@jkchemical.com;market6@jkchemical.com
Products Intro:
Product Name:Poly(tetrafluoroethylene), 60 wt % dispersion in H2O
CAS:9002-84-0
Package:100G;500G
Basic information Description References Safety Related Supplier