Polytetrafluoroethylene

• CAS: 9002-84-0
• Catalog Number: ACM9002840-10
• Category: Polymer/Macromolecule
• Molecular Weight: 100.01g/mol
• Molecular Formula: (CF2CF2)n
• Description: (PTFE), powder, mean particle size 20micron, weight 500 g
• Synonyms: TETRAFLUOROETHYLENE OLIGOMER;TETRAFLUOROETHYLENE RESIN;TEFLON;TEFLON 7A;TEFLON(TM) 30B;TEFLON(TM) 6;TEFLON(TM) 7A;POLYTETRAFLUOROETHYLENE
• IUPAC Name: 1,1,2,2-tetrafluoroethene
• Canonical SMILES: C(=C(F)F)(F)F
• InChI: InChI=1S/C2F4/c3-1(4)2(5)6
• InChI Key: BFKJFAAPBSQJPD-UHFFFAOYSA-N
• Boiling Point: -105.3 °F at 760 mm Hg (NTP, 1992);-75.9 °C;-19.9 °C;-75.9 °C;-75.9 °C;-105.3°F
• Melting Point: -224.5 °F (NTP, 1992);-142.5 °C;-89.0 °C;Melts to an extremely viscous gel at 327 °C;-131.15 °C;-131.2 °C;-224.5°F
• Flash Point: <32 °F (<0 °C) (closed cup) /Tetrafluoroethylene, inhibited/
• Density: 1.519 at -105 °F (NTP, 1992);2.2 g/cu cm;1.519 g/cu cm at -76 °C;Density (at -76 °C): 1.5 g/cm³;1.519 at -105°F
• Solubility: Insoluble (NTP, 1992);0.00 M;No substance has been found which will dissolve the polymer at moderate temperatures;In water, 1.59X10+2 mg/L at 25 °C;Solubility in water, mg/l at 25 °C: 159 (very slightly soluble)
• Alpha Sort: Polytetrafluoroethylene
• Autoignition Temperature: 370 °F (USCG, 1999);370 °F (188 °C) /Tetrafluoroethylene, inhibited/;188 °C
• Color/Form: White translucent to opaque solid;Soft, waxy, milk-white solid;White solid;Colorless gas
• Complexity: 55.6
• Covalently-Bonded Unit Count: 1
• Decomposition: [Table#2253];When heated to above 750 °F, decomposes to yield highly toxic fumes of fluorides.;[Table#2254];When heated to decomposition it emits highly toxic fumes of /fluorine/.;Decomposes explosively under pressures greater than 2025 mm Hg (2.66 atm). /Tetrafluoroethylene, inhibited/
• EC Number: 204-126-9;618-337-2
• Exact Mass: 99.993613g/mol
• Form: powder
• Formal Charge: 0
• H-Bond Acceptor: 4
• H-Bond Donor: 0
• Heavy Atom Count: 6
• ICSC Number: 1779
• LogP: log Kow = 1.21 (est);1.21 (estimated)
• Monoisotopic Mass: 99.993613g/mol
• Odor: Odorless
• Other Experimental: Not wetted by water; subject to cold flow at high pressure;Useful temp range cryogenic to +260 °C; Reverts to gaseous monomer at temperatures above 400 °C; Shore hardness 55-56; Tensile strength 3500-4500 psi; Flexural modulus about 80,000-90,000 psi at room temperature; Brittle point below -80 °C; Dielectric constant: 2.0-2.05 at 60 to 3X10+9 cycles;Waxy, slippery feel;A highly stable theromplastic tetrafluoroethylene homopolymer. Composed of at least 20,000 CF2 monomer units linked into very long unbranched chains. Not affected by water, aqua regia, chlorosulfonic acid, acetyl chloride, boron fluoride, hot nitric acid, boiling solutions of sodium hydroxide and organic solvents.;Low coefficient of friction; upon heating, weight loss varies from 0.001%/hr at 290 °C to 4%/hr at 450 °C;Only alkali metals and fluorine under pressure attack Teflon below 300 °C;Spun in molten state; density of threads about 2.3; breaking stress can reach 40 kg/sq mm with approx 30% elongation;Does not carbonize in air at 700 °C; at 400 °C = 0.0002% weight loss/hr, at 500 °C = 0.0002% weight loss/hr; at 600 °C = 0.0002% weight loss/hr; at 680 °C = 0.001% weight loss/hr; at 734 °C = 0.006% weight loss/hr; at 788 °C = 0.09% weight loss/hr;Melts to an extremely viscous gel at 327 °C and reverts to the gaseous monomer at temperatures above 400 °C;ODORLESS OR FAINT ODOR; CRITICAL TEMP: 92 °F= 33 °C= 306 DEG K; HEAT OF POLYMERIZATION: -450 BTU/LB= 250 CAL/G= -10.5X10+5 JOULES/KG; CRITICAL PRESSURE: 573 PSIA= 38.9 ATM= 3.95 MN/SQ M; HEAT OF COMBUSTION: -4,000 BTU/LB= -2,000 CAL/G= -90X10+5 JOULES/KG /INHIBITED/;Much heavier than air;Critical density = 0.58 g/cu cm; Heat of evaporation = 16,821 J/mol at -75.6 °C;Henry's Law constant = 0.629 atm-cu m/mol at 25 °C (est);Hydroxyl radical reaction rate constant = 1.13X10-11 cu cm/molec-sec at 298 K;Ozone reaction rate constant = 4.80X10-21 cu cm/molec-sec at 298 K;Nitrate radical reaction rate constant = <3X10-15 cu cm/molec-sec at 298 K
• Rotatable Bond Count: 0
• Stability: Stable under recommended storage conditions.;The finished polymerized compound is inert under ordinary conditions.
• UNII: OMW63Z518S
• UN Number: 1081;1081;1081;1081
• Vapor Density: 3.87 (NTP, 1992) (Relative to Air);3.87 (Air = 1);Relative vapor density (air = 1): 3.9;3.87
• Vapor Pressure: 22800 mm Hg at 70 °F (NTP, 1992);2.45e+04 mmHg;2.45X10+4 mm Hg at 25 °C /extrapolated/;Vapor pressure, kPa at 20 °C: 2947;22800 mmHg at 70°F
• XLogP3: 1.3

Case Study

Free Radical Trapping Behavior of Polytetrafluoroethylene Powder Under Electron Beam Irradiation

Oshima, Akihiro, et al. Scientific reports, 2021, 11, 1, 10907.

The effect of irradiation temperature on the radiation-induced fracture reaction of PTFE was discussed from the perspective of free radical trapping behavior.
· The higher the irradiation temperature, the higher the chain scission efficiency based on C-C bonds.
· When PTFE is irradiated in an oxygen-free atmosphere, DEA induces the generation of fluoroalkyl radicals.
· The main chain scission, which is induced by fluoroalkyl radicals, occurs with the β-scission producing Rf -CF3, Rf -CF = CF2 and an end-chain radical.
· The free radicals captured in PTFE are mainly medium-chain peroxide radicals captured in the crystalline region and quasicrystalline region, or at the interface and interchain region of PTFE.
· End-chain radicals generated by β-cleavage after dissociative electron attachment (DEA) induce a chain reaction of backbone defluorination, which is enhanced by synergistic thermal and radiation effects.

Custom Q&A

What is the reference number for Polytetrafluoroethylene in PubChem?

The reference number for Polytetrafluoroethylene in PubChem is SID 481110317.

What is the source category of this reference?

The source category of this reference is Governmental Organizations.

What is the version number of this reference?

The version number of this reference is 1.

When was this record deposited?

This record was deposited on 2023-05-10.

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This record was last modified on 2023-05-10.

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This record was made available on 2023-05-10.

What is the description of this reference?

The description of this reference states that it is part of a special collection of substances within PubChem that have synonyms collected from authoritative sources. For a more complete annotated record, see Polytetrafluoroethylene.

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Where can one find a more complete annotated record for Polytetrafluoroethylene?

One can find a more complete annotated record for Polytetrafluoroethylene by referring to the entry for Polytetrafluoroethylene in PubChem.