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Unformatted text preview: Peter Duan T.A.: Yanika Extra Credit: Polyethylene Polyethylene is a thermoplastic which is heavily produced throughout the world (roughly sixty million tons are produced throughout the world) and it is the most common plastic. Thermoplastic means that it is a plastic that becomes a liquid when heated and when it is cooled sufficiently, it becomes a brittle glass state. Polyethylene is a polymer and is made up of long chains of ethene or C 2 H 4 . Ethene, more commonly known as ethylene, is the simplest kind of alkene, an unsaturated chemical compound that consists of at least one carbon to carbon double bond. In the polymer industry, the abbreviation for polyethylene is PE similar to other polymers like polypropylene which has an abbreviation of PP. Polyethylene is a unique substance because it is so simple yet so versatile. Polyethylene is not only widely produced, but also widely categorized based on its density, branching, crystal structure, and molecular weight. Some of the polyethylene is the ultra high molecular weight polyethylene (UHMWPE), the high density polyethylene (HDPE), the cross-linked polyethylene (PEX), medium density polyethylene (MDPE), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE). Ultra high molecular weight polyethylene is also known as high modulus polyethylene (HMPE) or high performance polyethylene (HPPE). It has extremely long chains and the molecular weight is between two to six million. This is a very long chains and the molecular weight is between two to six million....
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- Spring '07
- Van Koppen
- Polymer, low density polyethylene