what is polyethylene terephthalate?
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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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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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A polyurethane is made from a chain of organic monomers linked by urethane links.\nThe raw materials will be determined by the desired effect of the polyurethane (ie fire resistance etc).\nCan be produced using a diisocyanate (types aromatic and aliphatic) with a polyol (usually a polyethelene glycolor polyester polyol) in the presence of a catalyst that will control the cell structure.
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Lycra is a type of Spandex.  They are segmented polyurethanes (SPU).  See the first link.\n\nFrom the second link: \nA new class of segmented polyurethane elastomers has been developed to mimic the morphology of spider silk fibers. Segmented polyurethanes consist of alternating hard and soft segments within the same polymer backbone. The hard segments phase separate into microcrystalline regions, which anchor the ends of the soft segments and lead to a large-scale physically cross-linked network structure.
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First of all, polymers are considered blends of different plastics to fit a certain usage.\n\nThermoplastic, from its name, tells us that these plastics can withstand extremely high and low temperature, so such plastics may be used for cooking and/or other things like containment of highly reactive materials.\n\nVOTE FOR BIG LINH HE NEEDS POINTS :P
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Plastic sacks: 0.2 lb petroleum needed for energy to create 1 lb polyethylene for sacks
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you can search the internet for "recycling plastic materials" in your area, there are many manufacturers who colect (they pay for this kind of waste) PE, PP, PS, ABS or PET and made granules from it, selling them after for more, as raw material.
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Commonly used biodegradable materials includes:\n\nThermoplastic Starch Materials (TSM) \n\nMater-Bi (PCL) \n\nPolylatic Acid (PLA) \n\nPoly-hydroxybutyrate-co-hydroxyvalerate (PHBV)
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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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Polyester is a category of polymers which contain the ester group in its' main chain. \n\nUsually, polyester refers to cloth woven from polyester fiber. \n\nPolyesters do exist in nature (Plant Cuticle), however, polyester generally refers to the large family of synthetic polyesters (plastics) which includes polycarbonate and polyethylene terephthalate (PET).\n\nGet an "A".
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Terephtalic acid (TPA) (or 1, 4-dicarboxyic benzene) is made from 1, 4- dimethylbenzene (or para-xylene). The xylene is oxidized using a catalyst to yield TPA. The xylene is a petrochemical isolated from crude oil.\n\nTPA is then reacted with ethylene glycol to produce the polyester,  first prepared by DuPont and sold under the name DACRON.
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Thermoplastic will melt, and can be remolded\nThermoset will NOT melt once molded. This is what you see plastic ashtrays made of to withstand the heat of a cigarette.\n\nEasy Wikipedia search\n\nhttp://en.wikipedia.org/wiki/thermoplast...\nFrom Wikipedia, the free encyclopedia\n\nA 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. Most thermoplastics are high molecular weight polymers whose chains associate through weak van der Waals forces (polyethylene); stronger dipole-dipole interactions and hydrogen bonding (nylon); or even stacking of aromatic rings (polystyrene). Thermoplastic polymers differ from thermosetting polymers (Bakelite; vulcanized rubber) which once formed and cured, can never be remelted and remolded. Many thermoplastic materials are addition polymers; e.g., vinyl chain-growth polymers such as polyethylene and polypropylene\n\n===== ===== ===== ===== ===== ===== ===== \n\nhttp://en.wikipedia.org/wiki/zylon...\nZylon\nFrom Wikipedia, the free encyclopedia\n\nZylon is a trademarked name for a range of thermoset polyurethane materials manufactured by the Toyobo Corporation. These are members of the synthetic polymer family of materials.\n\nIUPAC name: poly(p-phenylene-2,6-benzobiso...\n\nThe particular subset that Zylon is derived from are the EBXL-TPU plastics. (From electron beam cross-linked ThermoPlastic Polyurethane).\n\nVaguely related to Kevlar and nylon, Zylon is used in a number of applications that require very high strength with excellent thermal stability. Tennis racquets, Table Tennis blades, various medical applications, and some of the martian rovers are some of the more well known instances. \n\nSource(s):\n\nhttp://en.wikipedia.org/wiki
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looked everywhere! can't find anything. look at this link on wikipedia though.\n\nGood luck!\n\nGriptape is silicon carbide grit on a self adhesive backing
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It means that it is recyclable. The number indicates the type of plastic. The numbers are\n1 = Polyethylene terephthalate\n2 = High-density polyethylene\n3 = Polyvinyl chloride\n4 = Low density polyethylene\n5 = Polypropylene\n6 = Polystyrene\n7 = Any other plastics
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Thermoplastic will melt, and can be remolded\nThermoset will NOT melt once molded. This is what you see plastic ashtrays made of to withstand the heat of a cigarette.\n\nEasy Wikipedia search\n\nhttp://en.wikipedia.org/wiki/Thermoplastic\nFrom Wikipedia, the free encyclopedia\n\nA 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. Most thermoplastics are high molecular weight polymers whose chains associate through weak van der Waals forces (polyethylene); stronger dipole-dipole interactions and hydrogen bonding (nylon); or even stacking of aromatic rings (polystyrene). Thermoplastic polymers differ from thermosetting polymers (Bakelite; vulcanized rubber) which once formed and cured, can never be remelted and remolded. Many thermoplastic materials are addition polymers; e.g., vinyl chain-growth polymers such as polyethylene and polypropylene\n\n===== ===== ===== ===== ===== ===== ===== \n\nhttp://en.wikipedia.org/wiki/Zylon\nZylon\nFrom Wikipedia, the free encyclopedia\n\nZylon is a trademarked name for a range of thermoset polyurethane materials manufactured by the Toyobo Corporation. These are members of the synthetic polymer family of materials.\n\nIUPAC name: poly(p-phenylene-2,6-benzobisoxazole)\n\nThe particular subset that Zylon is derived from are the EBXL-TPU plastics. (From electron beam cross-linked ThermoPlastic Polyurethane).\n\nVaguely related to Kevlar and nylon, Zylon is used in a number of applications that require very high strength with excellent thermal stability. Tennis racquets, Table Tennis blades, various medical applications, and some of the martian rovers are some of the more well known instances.
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ref\n\nhttp://www.cem.msu.edu/~reusch/VirtualText/polymers.htm
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Many plastics materials are microwave transparent, but some grades of Polypropylene have been refined specifically for use in microwave cooking applications.\n\nBP is a major supplier, I suggest you look there?