CAS 9002-84-0 Polytetrafluoroethylene - Materials / Alfa Chemistry

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Polytetrafluoroethylene

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Catalog Number

ACM9002840-10

CAS Number

9002-84-0

Product Name

Polytetrafluoroethylene

Structure

Category

Polymers

Synonyms

TETRAFLUOROETHYLENE OLIGOMER;TETRAFLUOROETHYLENE RESIN;TEFLON;TEFLON 7A;TEFLON(TM) 30B;TEFLON(TM) 6;TEFLON(TM) 7A;POLYTETRAFLUOROETHYLENE

Description

(PTFE), powder, mean particle size 20micron, weight 500 g

IUPAC Name

1,1,2,2-tetrafluoroethene

Molecular Weight

100.01g/mol

Molecular Formula

(CF2CF2)n

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)

Color/Form

White translucent to opaque solid;Soft, waxy, milk-white solid;White solid;Colorless gas

Complexity

55.6

Covalently-Bonded Unit Count

EC Number

204-126-9;618-337-2

Exact Mass

99.993613g/mol

Form

powder

Formal Charge

Heavy Atom Count

ICSC Number

1779

Log P

log Kow = 1.21 (est);1.21 (estimated)

MeSH Entry Terms

tetrafluoroethene;tetrafluoroethylene;tetrafluoroethylene, ion(1+);tetrafluoroethylene, ion(1-)

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

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

MSDS

Download MSDS

COA

Download COA

Spec Sheet

Download Spec Sheet

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.

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