what is polyethyene technology.   what are the advances of high molecular weight by polyethyene technology?
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Polyethylene\n\n\nSynthetic polymer: A plastic polymer of ethylene.\nUse: Manufacture of containers,packaging, and electrical insulations.\n\nName  Chemical Formula  Properties  Uses  \nPolyethylene (PE)  - CH2 - CH2 -  Thermoplastic; translucent; permeable by hydrocarbons, alcohol, and gas; resistant to X rays and chemical agents  Film, bags, pipe and tubing, insulating sleeves, bottle stoppers, lids, plastic wrap, toys  \nPolypropylene (PP)  CH3\n|\n- CH2 - CH -  Thermoplastic; low density; durable; resistant to X rays; permeable by water; impact resistant and temperature resistant to 135 degrees C  Household items, plastic wrap, automobile parts, batteries, bumpers, garden furniture, syringes, bottles, appliances  \nPolystyrene (PS)  C6H5\n|\n- CH2 - CH -  Thermoplastic; transparent; nontoxic; optical and electrical properties; easy to color; resistant to X rays, oils, and grease  Plastic wrap, kitchen utensils, furniture covers, thermal insulation, toys, office supplies, disposable razors  \nPolyvinyl Chloride (PVC)  Cl\n|\n- CH2 - CH -  Thermoplastic; soft or rigid; opaque or transparent; fire resistant; resistant to X rays, acids, bases, oils, grease, and alcohol  Household items, electric wire insulation, water pipes, floor coverings, window \nand door coverings, baggage, vinyl, sport and camping gear, items for chemical and automobile industries  \nPolytetrafluoroethylene (PTFE) or Teflon  - CF2 - CF2 -  Chemically inert, antiadhesive, impermeable to water and grease, heat and corrosion resistant  Orthopedic and prosthetic appliances, hearing aids, joints, upholstery, corrosion-resistant mechanical parts, electrical insulation, frying pan coatings  \nPolymethyl Methacrylate (PMMA) or Plexiglas  CH3\n|\n- CH2 - C -\n|\nOCOCH3 Thermoplastic, optical properties, ages well, weather resistant  Glass substitute, neon signs, windows, portholes, optical fibers, dentistry, appliances, contact lenses  \nPolyamides (PA) (example: Nylon)  Example :\n\n- NH - (CH2)a - CO -\n\nwith a natural number  Thermoplastic, mechanical properties, durable to temperatures of 100 degrees C, resistant to X rays and fuel, impermeable to odors and gas  Food wrap, counters, gas, electricity, fuel pipes, shoes, ski bindings, bicycle seats  \nSilicone  R\n|\n- O - Si -\n|\nR\n\nExamples : R = CH3 or C6H5 Fluid, lubricant, antiadhesive, slightly toxic  Fluid for electrical transformers, putty, molding, antiadhesive coverings, varnish, wax, burn treatments, cosmetic surgery  \nUrea-Formaldehyde (UF)  Thermosetting, easy to form  Organic glass, dishes  \nPolyesters  - R - C - O - R' - O - C - R -\n|| ||\nO O\n\nwith R and R' two groups of atoms  Thermosetting, transparent, mechanical properties at high temperatures, electrical properties, resistant to impact, easy to work with  Textiles, plastic wrap, bottles, switches, electric sockets and fuses, appliances  \nPhenolics  Thermosetting, long lasting  Used in layers: Bakelite, durable varnish
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A thermoplastic is a material that is plastic or deformable, melts to a liquid when heated and freezes to a brittle, glassy state when cooled sufficiently.\n\nThermosetting plastics are polymer materials that cure, through the addition of energy, to a stronger form. The energy may be in the form of heat (generally above 200 degrees Celsius), through a chemical reaction (two-part epoxy, for example), or irradiation.\nThermoset materials are usually liquid, powder, or malleable prior to curing, and designed to be moulded into their final form, or used as adhesives.
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Polymer is a term used to describe a very long molecule consisting of structural units and repeating units connected by covalent chemical bonds. The term is derived from the Greek words: polys meaning many, and meros meaning parts [1]. The key feature that distinguishes polymers from other molecules is the repetition of many identical, similar, or complementary molecular subunits in these chains. These subunits, the monomers, are small molecules of low to moderate molecular weight, and are linked to each other during a chemical reaction called polymerization\n\nEpoxy:\n\nEpoxy or polyepoxide is a thermosetting epoxide polymer that cures (polymerizes and crosslinks) when mixed with a catalyzing agent or "hardener". Most common epoxy resins are produced from a reaction between epichlorohydrin and bisphenol-A.
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Because if it is made of plastic, Plastic is a product of petroleum.\n\nYou will probably be surprised to know that a plastic bottle is made from the same petrochemical as the fiber we call polyester!\n\nAll plastic products, many of the materials used to make the clothes you wear, or the carpet you walk on, plus hundreds of the other products we take for granted, are made from petrochemicals. As the name implies, a main ingredient in petrochemicals is oil. \n\nPlastic: Any of various complex organic compounds produced by polymerization, capable of being molded, extruded, cast into various shapes and films, or drawn into filaments used as textile fibers. \n-- Webster's Dictionary\n\nThat's an interesting definition, you may be thinking, but really -- how is plastic made? What's involved in the plastics manufacturing process? \nThe Basics of Plastic Manufacturing \n\nThe term "plastics" encompasses organic materials, such as the elements carbon (C), hydrogen (H), nitrogen (N), chlorine (Cl) and sulfur (S), which have properties similar to those naturally grown in organic materials such as wood, horn and rosin. Organic materials are based on polymers, which are produced by the conversion of natural products or by syththesis from primary chemicals coming from oil, natural gas or coal. \n\nThe plastic manufacturing process begins by heating the hydrocarbons in a "cracking process." Here, in the presence of a catalyst, larger molecules are broken down into smaller ones such as ethylene (ethene) C2H4, propylene (propene) C3H6, and butene C4H8 and other hydrocarbons. The yield of ethylene is controlled by the cracking temperature and is more than 30% at 850°C and such products as styrene and vinylchloride can be produced in subsequent reactions. These are then the starting materials for several other types of plastics. Therefore, this process results in the conversion of the natural gas or crude oil components into monomers such as ethylene, propylene, butene and styrene. \n\nThese monomers are then chemically bonded into chains called polymers. Different combinations of monomers yield plastic resins with different properties and characteristics. Each monomer yields a plastic resin with different properties and characteristics. Combinations of monomers produce copolymers with further property variations. \n\nThe resulting resins may be molded or formed to produce several different kinds of plastic products with application in many major markets. The variability of resin permits a compound to be tailored to a specific design or performance requirement. This is why certain plastics are best suited for some applications while others are best suited for entirely different applications. For instance, impact strength measures the ability of a material to withstand shock loading. Heat resistance protects the resin from exposure to excessive temperatures. Chemical resistance protects the resin from breakdown due to exposure to environmental chemicals. \n\nSome examples of material properties in plastic product applications are: \n\nHot-filled packaging used for products such as ketchup \nChemical-resistant packaging used for products such as bleach \nImpact strength of car bumpers \n\nThe Structure of Polymers \n\nPolymers are created by the chemical bonding of many identical or related basic units and those produced from a single monomer type are called homopolymers. These polymers are specifically made of small units bonded into long chains. Carbon makes up the backbone of the molecule and hydrogen atoms are bonded along the carbon backbone. \n\nPolymers that contain primarily carbon and hydrogen are classified as organic polymers. Polypropylene, polybutylene, polystyrene and polymethylpentene are examples of these.\n\nEven though the basic makeup of many polymers is carbon and hydrogen, other elements can also be involved. Oxygen, chlorine, fluorine, nitrogen, silicon, phosphorous and sulfur are other elem
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It's a monomer derive from petroleum , exactly how I am not sure  since I only do plastics.\n\nThe monomer is receive as is for polymerising to make   ,  pe , polyethylene.  Which makes the our plastic bags and some hoses (aquarium hoses).\n\nOn the re-cycle logo you can see "pe" , because today we have to declare. \n\nWhen the primodial bog sinks and plants turn to gas , petroluem and coal , ethylene is somewhere in there.\n\n** therefore the energy is solar at source , origin.
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There are all kinds of different materials lumped under the generic heading of "plastics".  The variations run into hundreds, perhaps even thousands of compounds!\n\nFor example, there's nylon.  The most familiar form, nylon 66, is a copolymer of adipic acid or adipoyl chloride and hexamethylene diamine.  But I can substitue various hydrocarbon chains in those two components to make nylon 55, nylon 65, nylon 48, nylon 83, etc.\n\nThen there are the families of polyaramid polymers, and polyester polymers, and polycarbonates, and . . . .\n\nNobody will ever be able to give you an exhaustive list here.  Try looking up some books on polymer chemistry at your library.
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Polysulfone is a thermoplastic polycondensate is used in electric connectors. This expensive material is electroplatable, and has high strength, good toughness, good dielectric strength, and dimensional stability. The trade name of this particular thermoplastic is Ultrason, I show below some variations on its formulation, versus its dielectric strength.
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Nanotechnology, currently, mostly has to do with materials science, via creating micro structures that can withstand extreme stresses in either longitudal (carbon nano-tubes) or rotational (bucky-balls) directions, and any connection to aerospace is merely a coincidental imagining of people who are dreaming up ways to use these new exotic materials for aerospace applications.  Nanotechnology, in essesnce, is 'building' materials (metals, plastics, polycarbonates) from the basic atomic/molecular structure up.\n\nCurrently the only applications that I have heard of are in relation to a surface to low earth orbit(LEO)'elevator' which would be used to hoist payloads from the surface to LEO.  This setup would be extremely fragile though and tend to break even with the current nano-materials available.  \n\nThe other area where it would be of interest and much more probably of use, is in the area of heat resistant applications such at heat shields for re-entering spacecraft.  Nano-materials can be engineered to be highly resistant to high temperatures without their material properties changing drastically.  This would be a far greater useablility than any sort of space elevator.
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try the site http://vivisimo.com it's a meta search engine\ntype in "energetic polymers" and you will get your results!
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cross linked poly ethylene
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Polymerise (v), Polymerization (n),  is a process of reacting monomer molecules together in a chemical reaction to form three-dimensional networks or polymer chains . There are many forms of polymerization and different systems exist to categorize them.\n\nThe main categories are\n\nAddition polymerization \nCondensation polymerization \nTerminology in the literature to represent these types of polymerizations is not standard: there are multiple terms for the same type. For example, "step polymerization" and "step-growth polymerization" refer to the same type of polymerization.\n\nHistory\nPolymerization dates back to the beginning of DNA based life, as both DNA and proteins can be considered polymers. The first 'synthetic' polymers of the 19th century were actually formed by modifying natural polymers. For example nitrocellulose was manufactured by reacting cellulose with nitric acid. The first genuinely man-made polymer, the phenol-formaldehyde resin bakelite, was synthesized in 1872. However, research into polymers and polymerization only really accelerated in the 1930s after the serendipitous discovery of polyethene by the chemical company ICI.
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PET is polyethylene\nPVC is polyvinylchloride\nHDP I am not familiar with\nHDPE is high density polyethylene\n\nWhat you store your material in depends upon its composition, but HDPE is very chemically resistant, so not knowing exactly what you have, I'd say it's a safe bet.
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alkenes like ethene,propene undergo addition reactions at high temperatures and pressures to form addition polymers like polythene,PVC etc.\nalkenes like ethene are used in artificial ripening of fruits.
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It is a registered trademark of the DuPont corporation.  \n\nIts chemical name is polymer of tetrafluoroethylene (PTFE)\n\nOne might surmise that Teflon is a condensation of TE from tetra, FL from flouro an ON just as a chemical material suffix (like carbON, borON, neON, argON, etc.)  Keep in mind that there isn't any standard for trade names, it's probably something that the marketing people came up with that "stuck" for naming Teflon.  (Yes, bad pun)
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Polyethylene terephthalate ( PET, PETE or the obsolete PETP or PET-P) is a thermoplastic polymer resin of the polyester family that is used in synthetic fibers; beverage, food and other liquid containers; thermoforming applications; and engineering resins often in combination with glass fiber. It is one of the most important raw materials used in man-made fibers.\n\nDepending on its processing and thermal history, it may exist both as an amorphous (transparent) and as a semi-crystalline (opaque and white) material. \nDensity 1370 kg/m3 \nYoung's modulus(E) 2800–3100 MPa \nTensile strength(σt) 55–75 MPa \nElongation @ break 50–150% \nnotch test 3.6 kJ/m2 \nGlass temperature 75 °C \nmelting point 260 °C \nVicat B 170 °C \nThermal conductivity 0.24 W/m.K \nlinear expansion coefficient (α) 7×10−5/K \nSpecific heat (c) 1.0 kJ/kg.K \nWater absorption (ASTM) 0.16 \nPrice 0.5–1.25 €/kg
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It's a carbon-hydrogen chain. \nIt is used in organic reactions.
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polymers\n\nMechanical properties of polymers\nCreep - the application of a constant (time independent) load causes a continuous displacement associated with the diffusion of the atoms or molecules within the material. This response is termed creep, the progressive deformation of a material under a sustained load. In metal alloys, creep becomes a problem at temperatures above approximately 0.6 Tm, where Tm is the melting temperature of the metal. However, in polymers, creep is an even more critical design problem because the polymers can be described as rubbery and viscous at temperatures above the glass transition temperature.\n\nWays to resist creep in polymers: In order to make polymers more resistant to creep at room temperature, increasing the degree of cross-linking within the polymer chain will raise the Tg. Therefore, a higher glass transition temperature allows for more resistance to creep. Furthermore, as molecular weight of the polymer increases, the viscosity, η will increase and effectively reduce the rate of creep. Also, the more crystalline the polymer, the more creep-resistant it is compared to entirely glassy polymers. \nJ-shaped stress-strain curves - Many biological materials actually display J-shaped stress-strain curves. In other words, the material will initially experience large extensions for small stresses. Then, as the extension gets larger and larger, the material gradually becomes stiffer and more difficult to extend.\n\nA J-shaped stress-strain curve enables biomaterials to be extremely tough. Because the lower part of the curve has large extensions for small stresses, the shear modulus in that region is very low and so any released strain energy can be prevented from contributing to fracture of the material. Furthermore, large extensions of the material require very large stresses, and so these large extensions are likely to occur only infrequently. The J-shaped stress-strain curve does not lead to the elastic instabilities which arise in S-shaped curves.\n\nAn example of biological materials with J-shaped stress-strain curves is mammalian skin tissue. If you pinch your earlobe and try to pull it downwards, it is initially easy to stretch, but then at larger extensions it becomes much more difficult to stretch.\n\nS-shaped stress-strain curves - These occur in lightly cross-linked polymers such as rubber. A material that exhibits an S-shaped stress-strain curve is very susceptible to elastic instability.\n\nIn the beginning part of the curve, the stiffness decreases as the load increases. This is due to confirmational changes within the polymer; the polymer is not yet deforming due to bond stretching. After large extensions or a high amount of load is applied to the material, a very large stiffness occurs because at these high loads, the polymer chains are mostly aligned with the applied stress. Therefore, applying even more stress will stretch the strong intramolecular bonds.\n\n\n[edit] Chemical properties of polymers\nThe attractive forces between polymer chains play a large part in determining a polymer's properties. Because polymer chains are so long, these interchain forces are amplified far beyond the attractions between conventional molecules. Different side groups on the polymer can lend the polymer to ionic bonding or hydrogen bonding between its own chains. These stronger forces typically result in higher tensile strength and melting points.\n\nThe intermolecular forces in polymers can be affected by dipoles in the monomer units. Polymers containing amide or carbonyl groups can form hydrogen bonds between adjacent chains; the positive hydrogen atoms in N-H groups of one chain are strongly attracted to the oxygen atoms in C=O groups on another. These strong hydrogen bonds, for example, result in the high tensile strength and melting point of polymers containg urethane or urea linkages. Polyesters have dipole-dipole bonding between the oxygen atoms in C=O groups and the hydrogen atom