High Molecular Weight Polyethylene Density
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UHMW is a thermoplastic that belongs to the polyolefin group of material.
High molecular weight polyethylene density. So HMWHDPE High Molecular Weight High Density Polyethylene. Molecular density characterizes polyethylene with UHMW being the most dense with a molecular weight of 31 million or higher. The Ziegler process produced a high-density polyethylene at pressures as low as atmospheric pressure.
High density polyethylene is made using a low pressure process and Ziegler-Natta or Phillips initiators to control the chain formation resulting in a highly linear unbranched structure. Ultra high molecular weight polyethylene UHMWPE on the other hand has a minimum density of 0930 gcm3. UTEC has a molecular weight about 10 times higher than High Density Polyethylene HDPE resins.
The molecular weight may be in the low range 3 million gmol medium range 5 million gmol or high range 7 to 10 million gmol. UHMW is simple to machine. As you might expect these resins are among the strongest polyethylenes pound for pound.
High-density polyethylene is a more durable polymer when compared to low-density polyethylene due to its lower degree of branching. Ultra High Molecular Weight Polyethylene UHMWPE. In order for a material to exhibit the properties typically associated with polymers the length of the chain must reach 550-700 repeating units.
High molecular weight high density polyethylene HMW HDPE can be defined as a linear homopolymer or copolymer having an average molecular weight in the range of 0210 million gmol. If you held two parts of the same design made from materials representing these two. Very low-density polyethylene VLDPE has a density range between 08800915 gcm3 and is used to make frozen food storage bags and plastic wrap.
23 rows Density. The Ultra High Molecular Weight of UTEC results in excellent mechanical properties such as. 00289 - 00524 lbin.
Metallocene catalysed variants are also available. UHMW ultra high molecular weight polyethylene is an extremely tough abrasion-resistant low-cost plastic used for a wide range of. It is an excellent choice for fabricated water tanks and chemical tanks.
This is the value of the n in the figure and provides a. UTEC is the trade name of the Ultra High Molecular Weight Polyethylene UHMWPE developed and produced by Braskem with its own technology resources. The molecular weight continues to rise over an AlTi ratio of 20 however the weight average remains constant.
Linear polyethylene can be produced in ultrahigh-molecular-weight versions with molecular weights of 3000000 to 6000000 atomic units as opposed to 500000 atomic units for HDPE. No surprize that by definition the density is high high density HD or over 940 gm cc. Because of the ability of the material to form either linear or branched structures the density of polyethylene can vary from a low of 0857 gcm3 to a maximum of 0975 gcm3.
Products with these different molecular weights are available in small average diameter around 150 m or large particle sizes average diameter around 205 m. To facilitate melt processing such polymers are typically produced with a relatively broad or bimodal molecular weight distribution. HDPE is more crystalline than LDPE and hence is more opaque more rigid and has a higher tensile strength.
HDPE high density polyethylene is a durable versatile low-cost abrasion- and chemical-resistant plastic material. These building blocks have a molecular weight of 28 gmole. HDPE is easy to fabricate and weld using thermoplastic welding equipment.
17 rows UHMW ultra-high-molecular-weight polyethylene offers a combination of exceptional properties. 0800 - 145 gcc.
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