'Polyethylene\r'

'Introduction : polythene is a type of polymer that is thermo malleable, subject matter that it washstand be melted to a liquid and remolded as it returns to a solid state. It is chemically synthesized from ethylene, a compound thats unremarkably made from crude oil or inborn gas. Other non-official names for this compound take polythene or polyethylyne; and it is as well as lessen as PE. It is use in devising other charge card compounds much ofttimes than its apply in its pure form. though it has a blanket(a) variety of uses, it contribute be counterproductive to humans and to the environment.Members of the polythene group be heavily employ in consumer products, and bothplace 60 jillion tons of these materials are produced worldwide every year. For instance, high meanness polythene (HDPE) is used for products such(prenominal) as milk jugs, detergent bottles, margarine tubs, drivel containers, and water pipes. revolutionary high molecular weight polythene (UHMWPE) is used in can- and bottle-handling machine parts, bearings, gears, joints, and butchers chopping boards, and may even be found in bulletproof vests. depressive disorder density polyethylene (LDPE) is used for the employment of rigid containers and plastic film.polytheneDescription :Physical propertiespolythene is a thermoplastic polymer consisting of bulky hydrocarbon chains. Depending on the crystallinity and molecular weight, a warming crestand glass novelty may or may non be observable. The temperature at which these occur varies potently with the type of polyethylene. For greenness commercial grades of medium- and high-density polyethylene the melting usher is typically in the range great hundred to 130 °C (248 to 266 °F). The melting point for average, commercial, low-density polyethylene is typically one hundred five to 115 °C (221 to 239 °F).Chemical propertiesMost LDPE, MDPE and HDPE grades have small chemical resistance, moment that it is not attacked by strong acids or strong bases. It is also resistant to propitiate oxidants and reducing agents. Polyethylene burns late with a low-spirited flame having a yellow finale and gives off an olfactory property of paraffin. The material continues electrocution on removal of the flame consultation and produces a drip. vapourous samples do not dissolve at room temperature. Polyethylene (other than cross-linked polyethylene) usually can be change state at wondrous temperatures in reminiscent hydrocarbons such as toluene orxylene, or in chlorinated solvents such as trichloroethane or trichlorobenzene.\r\nPolyethylene\r\nPolyethyleneIntroduction : Polyethylene is a type of polymer that is thermoplastic, meaning that it can be melted to a liquid and remolded as it returns to a solid state. It is chemically synthesized from ethylene, a compound thats usually made from petroleum or natural gas. Other non-official names for this compound include polythene or polyeth ylyne; and it is also abbreviated as PE. It is used in making other plastic compounds much often than its used in its pure form. Though it has a wide variety of uses, it can be harmful to humans and to the environment.Members of the polyethylene group are heavily used in consumer products, and over 60 million tons of these materials are produced worldwide every year. For instance, high density polyethylene (HDPE) is used for products such as milk jugs, detergent bottles, margarine tubs, garbage containers, and water pipes. Ultra high molecular weight polyethylene (UHMWPE) is used in can- and bottle-handling machine parts, bearings, gears, joints, and butchers chopping boards, and may even be found in bulletproof vests. Low density polyethylene (LDPE) is used for the production of rigid containers and plastic film.PolyethyleneDescription : Physical propertiesPolyethylene is a thermoplastic polymer consisting of long hydrocarbon chains. Depending on the crystallinity and molecular wei ght, a melting pointand glass transition may or may not be observable. The temperature at which these occur varies strongly with the type of polyethylene. For common commercial grades of medium- and high-density polyethylene the melting point is typically in the range 120 to 130 °C (248 to 266 °F). The melting point for average, commercial, low-density polyethylene is typically 105 to 115 °C (221 to 239 °F).Chemical propertiesMost LDPE, MDPE and HDPE grades have excellent chemical resistance, meaning that it is not attacked by strong acids or strong bases. It is also resistant to gentle oxidants and reducing agents. Polyethylene burns slowly with a blue flame having a yellow tip and gives off an odour of paraffin. The material continues burning on removal of the flame source and produces a drip. Crystalline samples do not dissolve at room temperature. Polyethylene (other than cross-linked polyethylene) usually can be dissolved at elevated temperatures in aromatic hydr ocarbons such as toluene orxylene, or in chlorinated solvents such as trichloroethane or trichlorobenzene.ProcessMonomerEthylene (ethene). The ingredient or monomer is ethylene (IUPAC name ethene), a gaseous hydrocarbon with the recipe C2H4, which can be viewed as a pair of methylene groups(=CH 2) connected to severally other. Because the catalysts are highly reactive, the ethylene essential be of high purity.\r\n'