Properties of polymers
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Polyethene & polypropene are made from
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monomers. These monomers ADD on to each other so we call them
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polymers.
Other polymers are formed by
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. This means another molecule -
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is made as well as the polymer.
Some polymers have
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chains. This affects the
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of the polymer. HDPE (high density polyethene) has
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branches and is not as strong as LDPE (low density polyethene) which has
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branches.
Some times
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have to be added to alter the properties. These allow the polymer chains to
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over each other which makes the polymer softer & more
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.
uPVC is the hard polymer used to make
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frames. If plasticiser is added to this the polymer it produces a soft , flexible substance that can be used for
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covering.
Some polymers are hard to dispose of. Thermoplastic polymers can be
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. Many polymers are not
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(will not rot) and are not affected by acids and other chemicals. There are however some new polymers around that have
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which allow them to decompose.
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