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In 1938, polytetrafluoroethylene (DuPont brand name Teflon) was discovered by accident by a recently hired DuPont Ph.D., Roy J. Plunkett. While working with tetrafluoroethylene gas to develop refrigerants, he noticed that a previously pressurized cylinder had no pressure remaining. In dissecting the cylinder, he found a mass of white solid in a ...
The commonly known brand name of PTFE-based composition is Teflon by Chemours, [4] a spin-off from DuPont, which originally invented the compound in 1938. [4] Polytetrafluoroethylene is a fluorocarbon solid , as it is a high- molecular-weight polymer consisting wholly of carbon and fluorine .
ETFE systems can control light transmission through the application of plasma coatings, varnishes or printed frit patterns. [5] Thermal and acoustic insulation can be incorporated into an ETFE structure via the use of multi-layer systems which use low-pressure air pumps to create ETFE "cushions". [ 6 ]
List of some addition polymers and their uses Polymer Abbreviation Properties Uses Low-density polyethylene: LDPE: Chemically inert, flexible, insulator: Squeeze bottles, toys, flexible pipes, insulation cover (electric wires), six-pack rings, etc. High-density polyethylene: HDPE: Inert, thermally stable, tough and high tensile strength
Public water systems in New Jersey are required to meet an MCL standard of 13 ppt. [180] [181] In 2020 the state set a PFOA standard at 14 ppt and a PFOS standard at 13 ppt. [182] In 2019 NJDEP filed lawsuits against the owners of two plants that had manufactured PFASs, and two plants that were cited for water pollution from other chemicals.
Nature has always been a powerful source of inspiration, with inventors diving into the world around them for new ideas. From the anatomy of animals to the behavior of plants, some of our most ...
Not all non-stick pans use Teflon; other non-stick coatings have become available. For example, a mixture of titanium and ceramic can be sandblasted onto the pan surface, and then fired at 2,000 °C (3,630 °F) to produce a non-stick ceramic coating. [19] Ceramic nonstick pans use a finish of silica (silicon dioxide) to prevent sticking.
The most common example is fluoroacetate, which occurs as a plant defence against herbivores in at least 40 plants in Australia, Brazil and Africa. [27] Other biologically synthesized organofluorines include ω-fluoro fatty acids , fluoroacetone , and 2-fluorocitrate which are all believed to be biosynthesized in biochemical pathways from the ...