Plastics are either thermosoftening or thermosetting depending on whether they ____ when heated. ____ plastics can be softened with heat and moulded again and again. Poly(ethene) and ____ are examples. In this type of plastic the polymer chains are held together by ____ intermolecular forces which are ____ by the heat. ____ plastics have strong bonds joining the polymer chains together formed when the plastic is made. The bonds ____ softening with heat so these plastics can’t be remolded. The plastic made depends on the monomer and on the ____ in which the plastic is made. For example, low density poly(ethene) is made from ____ chains formed under high pressure with a little ____. High density poly(ethene) comes from ____ chains that are formed at 500C, with slight pressure and the presence of a ____.

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