Polyethylene is the most popular plastic in the world.It has a very simple structure, the simplest of all commerical polymers. A molecule of polyethylene is a long chain of carbon atoms, with two hydrogen atoms attached to each carbon atom.
Linear polyethylene is normally produced with molecular weights in the range of 200,000 to 500,000, but it can be made even higher. Polyethylene with molecular weights of three to six million is referred to as ultra-high molecular weight polyethylene, or UHMWPE. UHMWP can be used to make fibers which are so strong they replaced Kevlar for use in bullet proof vests.
**Branched polyethylene is made by free radical vinyl polymerization.
**Linear polythylene is made by a more complicated procedure called Ziegler-Natta polymerization.
**UHMWPE is made using metallocene catalysis polymerization.
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