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11 Cards in this Set
- Front
- Back
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what are polymers. |
a long molecular chain built from monomer units alkenes form addition polymers with an alkene monomer |
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what are condensation polymers |
polymers formed by a condensation reaction which releases water. |
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wht are the monomers of plyesters |
a dicarboxylic acid and a diol alcohol fromd through a condensation reaction |
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what are the monomers of polyamides |
a dicarboxylic acid and diamine formed during a condenation reaction |
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give an example of a polyester |
terylene formed from benzene- 1,4 dicarboxylic acid and 1,2-ethanediol it is called polyethylene terephthalate (PET) |
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give 2 examples of polyamides |
nylon 6,6 fromed from hexne-1,6-dicarboxylic acid and 1,6-diaminohexane kevlar formed from benzene-1,4-dicarboxylic acid and benzene-1,4-diamine |
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describe the disposal of addition polymers |
the unreacivity makes them unbiodegradable incineration of addition polymers produces carbon monoxide carbon (link to global dimming) and carbon dioxide (link yo global warming) polymers also produce toxic chemicals when burnt such as HCN |
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describe the disposal of condensation polymers |
can be designed to biodegrade or photodegrade biodegrade by hdroolysis some condensation polymers degrade very slowly which is necessary for them to be useful such as nylon. others bioegrade quickly and are used in the disposable plastic ites such as packaging. |
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describe the hydrolysis of polyesters |
acid/base catlyst needed as hydrloysis with ure water is too slow base is prefered as it isnt reversible unlike acid |
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Describe the hydrolysis of polyamides |
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Describe recycling polymers |
-some polymers such as PET are widely recycled -this reduces the amount of plastic disposed in landfill and conserves crude oil -which is the source of most of the monomers used. -some polymers are melted and reused - condensation polymers can be hydrolysed back to their monomers - the disadvantage of recycling is that the plastic must be collected,sorted and processed which is expensive |
