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History of Teflon
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Teflon, a term that can be used to identify a very common celebrity in the world of synthetic polymers has been useful to humans for many years now. Teflon is a fluorocarbon polymer also known by the chemical name polytetrafluoroethylene.1 The name Teflon is the registered trademark of the DuPont Company for polytetrafluoroethylene.2 However, due to polytetrafluoroethylene being commercialized under the name Teflon, it has become its commonly used name. There are countless different uses of Teflon. Due to its many amazing properties, it is used in various everyday household products and in many other important ways. Properties and Application
• Teflon is resistant to strong acids, bases, heat, and solvents, which contributes to its many applications1
• played an important role in the war effort1
first used for the Manhattan Project during World War Two1
used in gaskets and values needed to concentrate uranium 235 due to its high resistance to the corrosive effect of uranium hexafluoride gas1
• Current uses of Teflon include:
non-stick cookware1
due to its high resistance to oils and grease, and its slippery and wax-like properties, it is used to coat various cookwares2
Teflon coating made it possible for the creation of non-stick cookware and since then has become an irreplaceable part of everyday life2
electrical insulators1
Teflon is not combustible or conductive3
space suits1
nose cones1
heat shields1
due to its high melting point3
Fuel tanks for space vehicles1
orthopedic and prosthetic appliances2
coating Automobile upholstery2
Teflon coating protects it from stains caused by spilled drinks and dirty shoes3
hearing aids2
corrosion-resistant mechanical parts2
coat fibers to make them water-repellant and stain-resistant3
Teflon coating causes water to form beads and slide of the surface3
a spray treatment for carpets
Schwartz, Debra A. "Just for the Gel of It." The Last Word:. N.p., n.d. Web. 03 Apr. 2014.
Before we can analyze the ethical use of DU ammunition, it is important to first establish the technology behind DU and DU weapons. Uranium is one of the heaviest elements found in nature and is emits alpha, beta, and gamma particles. It is 1.7 times denser than lead.12 The half-life of U238 (DU is 99% U238) is 4.5 billion years!13 Uranium byproducts(such as Thorium (Th232)) have even longer half-lives, making uranium an element that gets more radioactive during its own decay process.5 Natural uranium is 99.274% U238, 0.720% U235, and 0.0055% U234.14a Uranium is enriched when its contents of U235 reaches 3.2-3.6% (since U235 is fissible). Weapon-grade uranium is +90% U235.14a What is depleted uranium? We start out with natural uranium and extract enriched uranium for nuclear fuel and weaponry. The leftover from the extraction process is something very similar to natural uranium, known as “depleted uranium”. The only difference is that DU has 0.202% of U235 and 0.0008% of U234.14a How much DU do we currently have? As of June 1998, we have around 57,800 huge steel cylinders of DU or 496,000 metric tons. 14b Storage of DU is very complicated and problematic since corrosion of DU storage cylinders often occurs over relatively short periods of time.15
-creates a strong surface and can be used as a thin layer for glazes or a thick layers for impasto
The purpose of this lab was to investigate which additive(s) will create the longest lasting oil-in-water emulsion.
Linseed oil can be used to make the surface of wood furniture or paintings beautiful, but can also destroy if not used properly with certain materials. The rags that were left in the
Once again, it is a fashionable and stylish choice for adding personality and pizzazz to home décor, and craftsmen use it to embellish many decorative items.
Between U-235 and U-238, which one contains more natural uranium, and how can the 2 be separated to obtain pure U-235?
supplied by the uranium in sea water for 7 million years(Energy 25). This is a
The entire nuclear energy process starts with uranium. Uranium is the fuel for the nuclear reactors, often harvested near coal mines. Uranium is found in two types, U-235 and U-238, the one needed for the nuclear energy power is U-235. Uranium U-235 is one of the least plentiful elements making only 0.000002 percent of the earths’ crust. Although it is quite rare, one pound of Uranium can produce the same amount of energy as three million pounds of coal. U-235 is unstable in nature and highly radioactive making it a perfect match in the fission process. (How Nuclear Power Works 2)
Uranium was discovered by Martin Heinrich Klaproth, a German chemist, in the mineral pitchblende (primarily a mix of uranium oxides) in 1789.Klaproth, as well as the rest of the scientific community, believed that the substance he extracted from pitchblende was pure uranium, it was actually uranium dioxide (UO2). After noticing that 'pure' uranium reacted oddly with uranium tetrachloride (UCl4), Radioactivity was first discovered in 1896 when Antoine Henri Becquerel, a French physicist, detected it from a sample of uranium. Today, uranium is obtained from uranium ores such as pitchblende, uraninite , carnotite and autunite as well as from phosphate rock , lignite (brown coal) and monazite sand . Since there is little demand for uranium metal, uranium is usually sold in the form of sodium diuranate , also known as yellow cake, or triuranium octoxide).
It is used in the production of dyes, fertilizers, and chlorides as well as in electroplating and in the photographic, textile and rubber industries.
Polyethylene (PE) is one of the most commonly used polymers which can be identified into two plastic identification codes: 2 for high-density polyethylene (HDPE) and 4 for low density polyethylene (LDPE). Polyethylene is sometimes called polyethene or polythene and is produced by an addition polymerisation reaction. The chemical formula for polyethylene is –(CH2-CH2)n– for both HDPE and LDPE. The formation of the polyethylene chain is created with the monomer ethylene (CH2=CH2).
Polyethylene is a polymer that is made of a long chain of CH2 monomers bonded together. It is one of the most commonly used polymers in everyday items. Grocery bags, soap bottles, children’s toys, and even bullet proof vests are all made from polyethylene.2 This polymer is very versatile and can be used in many materials but this all depends on the way that the polymer is chemically made or enhanced. There are many different types of polyethylene classified by density and branching. 2
Fluorine is a chemical element as reagent. Fluorine causes very severe burns on contact with the skin, mucous membranes, and bones. In 1530, it is used to promote the fusion of metals or minerals.