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Ram B. Gupta and Kayoko Ono. Chemical Engineering, Auburn University, 0322 Haley Center, Auburn, AL 36849-5127
Gas and vapor separations using polymer membranes has been brought to focus in the past 20 years. Teflon AF products (DuPont) are amorphous, glassy copolymers consisting of 2,2-bistrifluoromethyl-4,5-difluoro-1,3-dioxole (PDD) and tetrafluoroethylene (TFE). Teflon AF 2400 contains 87 mol % of PDD and 13 % of TFE with Tg = 240 C, whereas Teflon AF 1600 contains 65 mol % of PDD and 35 % of TFE with Tg = 160 C. Teflon AFs have high temperature stability and chemical resistance, as well as high free volume compared to the conventional glassy polymers. Permeability coefficients of CO2 in Teflon AF 2400, Teflon AF 1600, and poly(tetrafluoroethylene) (PTFE) are measured, at varying feed pressure and temperature. The permeability increase in the order of PTFE < Teflon AF 1600 < Teflon AF 2400. This can be explained by the fact that PTFE is a semicrystalline polymer and Teflon AFs are high free volume glassy polymers. In addition, the reuse of the membrane for second and third time resulted in enhancement of the permeability, which can be attributed to the CO2 plasticization of the membrane. Further understanding of the transport of CO2 through the membranes is obtained by applying solution-diffusion model.
What else can I help you with?
What is the relative permeability of Teflon?
The relative permeability of Teflon is very close to 1, indicating that it is a poor conductor of magnetic fields. Teflon is generally considered to be non-magnetic and has low permeability compared to ferromagnetic materials.
What is the monomer of Teflon?
Teflon is polytetrafluoroethylene, so the monomer is tetrafluoroethylene.
What is density of teflon?
Density of POLYTETRAFLUOROETHYLENE (TEFLON):The density of Teflon is 2200 kg/m3.
What is special about Teflon?
- Teflon is very resistant to other chemicals - Teflon is a good electrical insulator - Teflon is thermo-resistant - Teflon has a very low coefficient of friction - Teflon is a non-stick material used for coatings - Teflon is a thermoplastic material
What is the density of teflon?
Density of POLYTETRAFLUOROETHYLENE (TEFLON):The density of Teflon is 2200 kg/m3.
What is the relative permeability of Teflon?
The relative permeability of Teflon is very close to 1, indicating that it is a poor conductor of magnetic fields. Teflon is generally considered to be non-magnetic and has low permeability compared to ferromagnetic materials.
What is the ability of a cell membrane to allow material to pass through it called?
permeability
What feature of a membrane describes whether molecules can cross the membrane?
permeabiity
What is the monomer of Teflon?
Teflon is polytetrafluoroethylene, so the monomer is tetrafluoroethylene.
Is Teflon thermosetting or thermoplastic?
Teflon is a thermoplastic.
Does silt have high permeability?
Silt has neither high or low permeability. It has moderate permeability. :) !
What is density of teflon?
Density of POLYTETRAFLUOROETHYLENE (TEFLON):The density of Teflon is 2200 kg/m3.
Do they make something like teflon that's tougher?
Alluminum teflon is tougher than most other teflon.
What are the medical uses for teflon?
is teflon used in heart valves
What is special about Teflon?
- Teflon is very resistant to other chemicals - Teflon is a good electrical insulator - Teflon is thermo-resistant - Teflon has a very low coefficient of friction - Teflon is a non-stick material used for coatings - Teflon is a thermoplastic material
What is the density of teflon?
Density of POLYTETRAFLUOROETHYLENE (TEFLON):The density of Teflon is 2200 kg/m3.
Does teflon contain cyanide?
No, Teflon does not contain cyanide. Teflon is a synthetic polymer that is primarily composed of carbon and fluorine atoms. Cyanide is a compound made of carbon and nitrogen atoms and is not found in Teflon.
