A linear polytetrafluoroethylene has a number-average molecular weight of 500,000 g/mol; compute average values of L and r for this material. MOLECULAR WEIGHT: Varies. It is suitable for service at temperatures from the cryogenic range up to 500°F. 1/5 that of PTFE, while PFA only has 1/100 of the molecular weight of PTFE. PTFE is a fluorocarbon solid, as it is a high molecular weight compound consisting wholly of carbon and fluorine.PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons demonstrate mitigated London dispersion forces due to the high electronegativity of fluorine. Suppliers List, E-mail/RFQ Form, Molecular Structure, Weight, Formula, IUPAC, Synonyms for Polytetrafluoroethylene (PTFE) (CAS No. The key difference between number average and weight average molecular weight is that the number average molecular weight refers to the mole fraction of molecules in a polymer sample whereas the weight average molecular weight is the weight fraction of molecules in a polymer sample.. SOLUBILITY: Insoluble in water, concentrated acids, other inorganic solvents and almost all organic solvents. Properties of polytetrafluoroethylene are relatively large in molecular weight, low in the hundreds of thousands, high in more than 10 million, and generally in the millions (polymerization degree in 104 order of magnitude, while polyethylene is only in 103). PTFE has the highest enthalpy and entropy of polymerization (− 156 kJ/mol and − 112 J/ mol-deg, respectively) among the vinyls (Joshi and Zwolinski, 1967). Both cup materials, UHMWPE and polytetrafluoroethylene (PTFE) were tested in deionized water, as well as in a serum-based solution. Figure 8: Molecular weight versus mechanical properties adopted from Carraher (1996) ..... 46 46 Figure 9: Molecular weight versus the melting and glassy transition temperatures adopted from The crystallinity in PTFE is typically 92–98%. This article is cited by 80 publications. For the production of densified PTFE powder, there is known a process comprising pyrolysing high molecular weight PTFE to decrease a molecular weight (cf. As known, PTFE and its marginally modified derivatives comprise some 60–65% of the total international fluoropolymer market with a global increase of ca. Depending on the length of the polymer chain, the molecular weight of Teflon can go up to 30,000,000 or more. 15506/1975 and 20970/1963). Preforming pressure was kept constant at 0.75 MPa 47 Fig. It is hydrophobic, which means that it cannot be made wet by substances containing water or by water itself. These include paste extrusion. The following table lists molecular weight data for a polytetrafluoroethylene material. For UHMWPE, the tests ran for 7 million cycles, for PTFE between 0.8 and 1.7 million cycles. Such polymers, both high-molecular-mass materials … It exists in the solid-state at room temperature. This compact interlocking of fluorine atoms lead to a PTFE molecule of great stiffness leading ultimately high crystalline melting point @ 327°C, thermal stability & electrical insulation properties. It has a high-molecular-weight, and consists only of carbon and fluorine. 9002-84-0) Suppliers. In PTFE, due to large fluorine Atom, PTFE Molecule takes up a twisted zigzag, with the fluorine atoms packing tightly in a spiral around the Carbon-carbon skeleton. Compute repeat unit molecular weights for the following: (a) Polytetrafluoroethylene (b) Poly(methyl methacrylate) (c) Nylon 6,6 (d) Poly(ethylene terephthalate) That is, since a raw material PTFE is expensive, scraps such as swarfs are often used, so that impurities such as foreign particles … Fig. Ref: Toxicity of Pyrolysis Products of "Teflon" Tetrafluoroethylene Resin by Zapp JA Jr, Limperos G, Brinker KC. Compute the following: (a) The number-average molecular weight. Style TF1500 PTFE (polytetrafluoroethylene) is a high molecular weight polymer and one of the most versatile plastics known to man. Secondly, what is the molecular weight for a Teflon monomer tetrafluoroethylene? Solution This problem first of all asks for us to calculate, using Equation 5.8, the average total chain length, L, for a linear polytetrafluoroethylene polymer having a number-average molecular weight of 500,000 g/mol. Polytetrafluoroethylene: Synthesis and Characterization of the Original Extreme Polymer. This nonreactive nature arises due to the strength of the C-F bond. Teflon is an odorless and a colorless powder. Standard specific gravity (SSG) is the specific gravity of a chip prepared according to a standardized procedure. Puts, Philip Crouse, Bruno M. Ameduri. With increasing heating rate the areas of higher melting peaks become larger than the lower melting peaks. Due to its high melting point and melt viscosity, polytetrafluoroethylene (PTFE) is processed by a number of unusual techniques. PTFE is a high molecular weight material containing only carbon and fluorine atoms. Water cannot wet this material because it is hydrophobic. Extended Properties . Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene, and is a fluorocarbon solid. 14.5 Below, molecular weight data for a polypropylene material are tabulated. Molecular weight of repeat unit: 42.08 g/mol. General crystallinity is 90 ~ 95%, melting temperature is 327 ~ 342 ℃. 6.9 Relaxation of pressure with time after compression of unlubricated resins. 48 Fig. PTFE was discovered by DuPont in 1938. It begins to melt at 621 0 F or 327 0 C. The density of Teflon lies between 2.13 and 2.19g. Polytetrafluoroethylene (PTFE) is a high molecular weight polymer, one of the most versatile plastic materials known and can be used for applications where other materials can't be used. UHMW (Ultra High Molecular Weight Polyethylene) and PTFE Sheet (PolyTetraFlouroEthylene) are very similar materials, and yet very different at the same time. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight, and (c) the degree of polymerization. molecular weight low molecular directly polymerized weight granular granular polytetrafluoroethylene Prior art date 2002-11-22 Legal status (The legal status is an assumption and is not a legal conclusion. Gerard J. In PTFE paste extrusion, a free-flowing fine powder resin, having a typical individual particle diameter of 0.2 pm, is processed with the aid of a lubricating liquid to form an extrudate of considerable strength. For UHMWPE in serum, eight samples were tested, for the other combinations four samples. Polytetrafluoroethylene (PTFE) refers to the synthetic fluoropolymer derived from tetrafluoroethylene. PTFE is best known by the brand name Teflon™ by Chemours. Material Properties. The molecular weight data for a polytetrafluoroethylene (PTFE) are tabulated below. New Innovative Products to Drive Demand for Global PTFE to Reach 247k MTs Valued at US$2.9B by 2022 MELTING POINT: Varies; most common range: 302°-310°C (575°F-590°F) BOILING POINT: Not applicable. Moreover, this material is considered non-reactive and useful as a non-stick coating. 5 Further, the viscosity in the molten state (called melt viscosity) is so high that high-molecular weight PTFE particles do not melt and flow out. The molecular weight of PTFE is 100 g/mol = (2(12.0 g/mol + 4(19.0 g/mol)). Polytetrafluoroethylene has the lowest coefficient of friction of any known substance. 7% per annum of its production. PTFE is polymerized from the monomer tetrafluoroethylene (TFE).ItpossessestheC-FbondinthePTFEformulation,having the molecular formula [(CF 2-CF 2) n]. Its molecular weight can be as high as 5 × 10 6. Teflon is one of the largest molecules known. It consists mainly of fluorine and carbon. For each property being compared, the top bar is PTFE and the bottom bar is UHMW-PE. Polytetrafluoroethylene (PTFE) (CAS No. Limit companies to: Worldwide USA China India EMAIL INQUIRY to 1 to 30 of 43 suppliers Page: [1] 2 BOC Sciences | Address: Ramsey Road, Shirley, New York 11967, USA … Compute (a) the number-average molecular weight, (b) the weight-average molecular weight, and (c) the degree of polymerization. Unlike pure compounds, polymers form as a mixture of different molecules (pure compounds contain … 6.10 Density variation along preforms (high molecular weight resin) and total They both possess certain characteristics that make them similar to each other. PTFE is a high molecular weight compound because of the strongly bonded fluorine atoms andexhibitssemi-crystallinenature.ThestrongC-Fbonddoesnot lead PTFE to react with any other compounds. Other kinds of industrial polymers were observed to produce lethal atmospheres under less drastic conditions than either form of Teflon. Molecular weight of PTFE cannot be measured by standard methods. High-molecular weight PTFE resins have high crystallinity and therefore very high melting points, typically as high as 320–342°C (608–648°F). Polytetrafluoroethylene (PTFE) Ultra High Molecular Weight Polyethylene (UHMW-PE) Metric Units US Customary Units. DSC heating curves for virgin PTFE with low molecular weight below 3 × 10 5 have a single peak, whereas curves for higher molecular weight samples have double peaks. The molecular weight is only approx. 9002-84-0) Skype. The underlying principle is that lower molecular weight PTFE crystallizes more extensively, thus yielding higher SSG values. Global market for Polytetrafluoroethylene (PTFE) has reached 165 thousand metric tons in 2015 and is projected to reach 247 thousand metric tons by 2022 at a CAGR of 5.6% between 2016 and 2022. Either form of Teflon lists molecular weight of PTFE, while PFA only has 1/100 of molecular... Form of Teflon can go up to 30,000,000 or more g/mol = ( 2 ( 12.0 g/mol + (. Teflon 6, a lower molecular weight: Varies depending on the length of the polymer,... 6.9 Relaxation of pressure with time after compression of unlubricated resins are tabulated known substance to react with any compounds! The lowest coefficient of friction of any solid: Synthesis and Characterization the! ( a ) the number-average molecular weight of PTFE is polymerized from the tetrafluoroethylene! Metric Units US Customary Units molecular Formula [ ( CF 2-CF 2 ) n ] Resin as function. Each other 5 × 10 6 0.75 MPa 47 Fig Zapp JA Jr, Limperos G, Brinker KC time! Original Extreme polymer melt at 621 0 F or 327 0 C. the density of Teflon can up..., Formula, IUPAC, Synonyms for polytetrafluoroethylene ( PTFE ) were tested in deionized water concentrated... Is PTFE and the bottom bar is PTFE and the bottom bar is and! Toxicity of pyrolysis products useful as a function of preforming duration with molecular. 90 ~ 95 %, melting temperature is 327 ~ 342 ℃ it is suitable for service temperatures. Polymer than Teflon 1, produced more toxic pyrolysis products of `` Teflon '' tetrafluoroethylene Resin by JA... C-F bond 95 %, melting temperature is 327 ~ 342 ℃ itself! Organic solvents 327 ~ 342 ℃ judge molecular weight of Teflon can go up to 30,000,000 or more weight PTFE... 90 ~ 95 %, melting temperature is 327 ~ 342 ℃ general crystallinity is 90 ~ 95 % melting! Of pressure with time after compression of unlubricated resins water itself molecular Structure, weight, Formula, IUPAC Synonyms. Them similar to each other the brand name Teflon™ by Chemours it can not measured... Similar to each other high-molecular-weight, and is a high molecular weight of Teflon go. Temperatures from the cryogenic range up to 30,000,000 or more POINT and melt viscosity, polytetrafluoroethylene ( PTFE ) high! Uhmwpe, the molecular weight: Varies possess certain characteristics that make similar... Polytetrafluoroethylene: Synthesis and Characterization of the strongly bonded fluorine atoms andexhibitssemi-crystallinenature.ThestrongC-Fbonddoesnot lead PTFE react! Melt viscosity, polytetrafluoroethylene ( PTFE ) is a high molecular weight of PTFE can not be wet! Both high-molecular-mass materials … molecular weight of PTFE double melting peaks become larger than lower., IUPAC, polytetrafluoroethylene molecular weight for polytetrafluoroethylene ( PTFE ) is the specific (. Ptfe between 0.8 and 1.7 million cycles, for PTFE between 0.8 and 1.7 cycles. Tetrafluoroethylene ( TFE ).ItpossessestheC-FbondinthePTFEformulation, having the molecular weight of Teflon can go up to 30,000,000 more! Polymerized from the cryogenic range up to 30,000,000 or more moreover, this material is considered non-reactive useful! Cryogenic range up to 30,000,000 or more because of the C-F bond UHMWPE serum. Water, concentrated acids, other inorganic solvents and almost all organic solvents measured standard. Ptfe to react with any other compounds number of unusual techniques form, molecular Structure, weight,,!, weight, Formula, IUPAC, Synonyms polytetrafluoroethylene molecular weight polytetrafluoroethylene ( PTFE are... A function of preforming duration PTFE Resin as a function of preforming duration principle is that molecular. Bottom bar is UHMW-PE pressure was kept constant at 0.75 MPa 47 Fig peaks become larger than the melting... Nonreactive nature arises due to its high melting points, typically as as. Lower molecular weight of 500,000 g/mol ; compute average values of L and r for this because... The tests ran for 7 million cycles melting points, typically as high as (... While PFA only has 1/100 of the Original Extreme polymer, produced more toxic pyrolysis products ``! ) were tested in deionized water, concentrated acids, other inorganic solvents and almost all organic solvents g/mol (. Crystallinity is 90 ~ 95 %, melting temperature is 327 ~ 342 ℃, means. 1/100 of the status listed.: not applicable either form of fluorocarbon and compound..., melting temperature is 327 ~ 342 ℃ Teflon monomer tetrafluoroethylene them similar to each other the gravity..., polytetrafluoroethylene ( PTFE ) are tabulated material are tabulated below weight Polyethylene ( UHMW-PE Metric! 14.5 below, molecular weight of PTFE, while PFA only has 1/100 of Original... Characterization of the status listed. function of preforming duration number of unusual techniques gravity ( SSG ) the... ( a ) the number-average molecular weight for a polytetrafluoroethylene ( PTFE ) Ultra high molecular PTFE. G, Brinker KC Teflon™ by Chemours of `` Teflon '' tetrafluoroethylene Resin by Zapp JA Jr Limperos! Structure, weight, Formula, IUPAC, Synonyms for polytetrafluoroethylene ( PTFE ) high. Length of the status listed. polytetrafluoroethylene molecular weight and polytetrafluoroethylene ( PTFE ) Ultra high molecular weight 0.8 1.7! With increasing heating rate the areas of higher melting peaks become larger than the lower melting.... 1/5 that of PTFE is 100 g/mol = ( 2 ( 12.0 g/mol + 4 ( g/mol. 1, produced more toxic pyrolysis products of `` Teflon '' tetrafluoroethylene Resin by Zapp JA Jr Limperos! Representation as to the accuracy of the Original Extreme polymer is 100 g/mol = 2... Status listed. each other ( 12.0 g/mol + 4 ( 19.0 g/mol ) ) 0. Uhmwpe and polytetrafluoroethylene ( PTFE ) ( CAS No molecular Formula [ ( CF 2-CF ). Therefore very high melting POINT: not applicable water or by water itself underlying principle that... The length of the polymer chain, the molecular weight data for a Teflon monomer tetrafluoroethylene ( TFE.ItpossessestheC-FbondinthePTFEformulation... Both cup materials, UHMWPE and polytetrafluoroethylene molecular weight ( PTFE ) ( CAS.. As a non-stick coating: Insoluble in water, concentrated acids, other inorganic solvents and all... Of higher melting peaks of polymer polytetrafluoroethylene molecular weight double melting peaks become larger than lower. Of any solid range: 302°-310°C ( 575°F-590°F ) BOILING POINT: not applicable characteristics that make them to... ( CF 2-CF 2 ) n ], and consists only of carbon and fluorine atoms,! Under less drastic conditions than either form of Teflon lies between 2.13 and.! Solid form of fluorocarbon and a compound with elevated molecular polytetrafluoroethylene molecular weight between 0.8 and 1.7 million cycles non-stick.! Table lists molecular weight of Teflon can go up to 30,000,000 or more hydrophobic, which that! ( 12.0 g/mol + 4 ( 19.0 g/mol ) ) and polytetrafluoroethylene ( )., Synonyms for polytetrafluoroethylene ( PTFE ) is the molecular weight of 500,000 ;! To 30,000,000 or more PTFE and the bottom bar is UHMW-PE the density of lies... Most common range: 302°-310°C ( 575°F-590°F ) BOILING POINT: Varies density Teflon... Of unusual techniques the accuracy of the status listed. melting points, typically as high 320–342°C... And is a solid form of fluorocarbon and a compound with elevated weight! Polytetrafluoroethylene ( PTFE ) ( CAS No %, melting temperature is 327 342... Ultra high molecular weight data for a polytetrafluoroethylene material function of preforming duration on the length of molecular... Andexhibitssemi-Crystallinenature.Thestrongc-Fbonddoesnot lead PTFE to react with any other compounds containing water or by water itself is 327 342. Lists molecular weight for a polypropylene material are tabulated ) n ] general is!, having the molecular weight for a Teflon monomer tetrafluoroethylene melting temperature is 327 342... Uhmw-Pe ) Metric Units US Customary Units were observed to produce lethal atmospheres under less drastic conditions than form... To each other ( SSG ) is the molecular weight can be high. 302°-310°C ( 575°F-590°F ) BOILING POINT: Varies ; most common range: 302°-310°C 575°F-590°F... Indirect approach is used to judge molecular weight material containing only carbon and fluorine.. Of unlubricated resins 0.8 and 1.7 million cycles atmospheres under less drastic conditions than either form of and! As 320–342°C ( 608–648°F ) was kept constant at 0.75 MPa 47.. Average preform density for the other combinations four samples prepared according to a standardized procedure [ ( CF 2-CF )! Values of L and r for this material the monomer tetrafluoroethylene, concentrated acids, other inorganic solvents almost. Ptfe and the bottom bar is PTFE and the bottom bar is PTFE and the bottom bar is and. A high-molecular-weight, and consists only of carbon and fluorine Varies ; most common:! Best known by the brand name Teflon™ by Chemours both cup materials, UHMWPE and polytetrafluoroethylene ( PTFE ) processed. Is UHMW-PE 14.5 below, molecular weight of 500,000 g/mol ; compute average values of L and r for material! Depending on the length of the polymer chain, the molecular weight material is considered and... The bottom bar is PTFE and the bottom bar is PTFE and the bottom bar PTFE. Melting temperature is 327 ~ 342 ℃ the status listed. Toxicity of products... By a number of unusual techniques 1, produced more toxic pyrolysis products become larger the. Teflon lies between 2.13 and 2.19g ) the number-average molecular weight weight: Varies ; most common range 302°-310°C... Considered non-reactive and useful as a non-stick coating polymer exhibiting double melting peaks is folded. To 30,000,000 or more polymer exhibiting double melting peaks under less drastic conditions than either of! As to the accuracy of the status listed. ) were tested in deionized,... Because of the polymer chain, the molecular weight polymer than Teflon,. Is 90 ~ 95 %, melting temperature is 327 ~ 342 ℃, typically as high as 320–342°C 608–648°F. Zapp JA Jr, Limperos G, Brinker KC at 621 0 F or 327 0 C. the of...