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The double bond in an alkene (like ethene) can be broken open and joined to other molecules. A molecule of ethene can be joined to another molecule of ethene. In the process, the second ethene molecule has its double bond broken, and this may be added to a third molecule of ethene, and so on. Many ethene molecules can be joined together to form a polymer. The polymer is called poly(ethene) because it is made from ethene. Poly(ethene) is commonly called polythene. Polythene is an ICI trademark for poly(ethene). Ethene put under pressure and heated with a catalyst will polymerise to form poly(ethene). Note that there are no double bonds in the polymer. Poly(ethene) is an alkane. It is a saturated hydrocarbon. A polymer is often written in the form A polymer which is formed from monomers added together where no substance (other than the polymer) is produced is called an addition...

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