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Polymers generally are defined as long chain molecules that comprise covalently connected moieties, and that interact through relatively weak intermolecular forces.These structural features are responsible for many of the unique properties of polymeric materials and set them apart from traditional materials such as low molecular weight organic species, metals and ceramics. Ultra-high molecular weight (UHMW) polymers, a term commonly used to refer to macromolecules with molecular weights that exceed 106 g/mol, therefore, typically have superior properties, but are virtually intractable when applying conventional processing.
UHMWPW (Ultra-high-molecular-weight polyethylene) is a the thermoplastic polyethylene. Also known as high-modulus polyethylene, it has extremely long chains, with a molecular mass usually between 2 and 6 million. The longer chain serves to transfer load more effectively to the polymer backbone by strengthening intermolecular interactions. This results in a very tough material, with the highest impact strength of any thermoplastic presently made.UHMWPE (Ultra-high-molecular-weight polyethylene, sometimes ...
... shortened to UH) is a type of polyolefin.
Ultra-high-molecular-weight polyethylene is odorless, tasteless, and nontoxic. It is highly resistant to corrosive chemicals except oxidizing acids; has extremely low moisture absorption and a very low coefficient of friction; is self-lubricating; and is highly resistant to abrasion, in some forms being 15 times more resistant to abrasion than carbon steel. Its coefficient of friction is significantly lower than that of nylon and acetic, and is comparable to that of polytetrafluoroethylene, but UHMWPE has better abrasion resistance than PTFE.
UHMWPE is a type of polyolefin. It is made up of extremely long chains of polyethylene, which all align in the same direction. It derives its strength largely from the length of each individual molecule (chain). Van der Waals bonds between the molecules are relatively weak for each atom of overlap between the molecules, but because the molecules are very long, large overlaps can exist, adding up to the ability to carry larger shear forces from molecule to molecule. Each chain is bonded to the others with so many Van der Waals bonds that the whole of the inter-molecule strength is high. In this way, large tensile loads are not limited as much by the comparative weakness of each Van der Waals bond.
UHMWPE is processed variously by compression molding, ram extrusion, gel spinning, and sintering. Several European companies began compression molding UHMW in the early 1960s. Gel-spinning arrived much later and was intended for different applications.
In gel spinning a precisely heated gel of UHMWPE is extruded through a spinneret. The extrudate is drawn through the air and then cooled in a water bath. The end-result is a fiber with a high degree of molecular orientation, and therefore exceptional tensile strength. Gel spinning depends on isolating individual chain molecules in the solvent so that intermolecular entanglements are minimal. Entanglements make chain orientation more difficult, and lower the strength of the final product.
UHMWPE is synthesised from monomers of ethylene, Ultra-High Molecular Weight pipe,Ultra-High Molecular Weight Polyethylene,Ultra-High Molecular Weight Polyethylene pipe which react together in the presence of a catalyst to form ultra-high-molecular-weight polyethylene.
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UHMWPE is synthesised from monomers of ethylene, Ultra-High Molecular Weight pipe,Ultra-High Molecular Weight Polyethylene,Ultra-High Molecular Weight Polyethylene pipe which react together in the presence of a catalyst to form ultra-high-molecular-weight polyethylene,
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