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6 Cards in this Set
- Front
- Back
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Describe the process of polymerisation |
monomers are passed at high tempreture over a catalyst. the double bond opens up and forms a polymer chain made of the monomers |
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what uses do we have for polymers? |
polymer: Typical use Polythene: Plastic bags and bottles Polypropene: Crates and ropes Polychloroethene: water wipees and isulation on electricty cables. |
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Why is it important? |
they are made from crude oil which is non renewable. |
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what are biodegradeable plastics? |
plastics that break down easily. corn stratch are built into the plastic. microorganisims in soil feed on corn scratch. this breaks the plastic down. |
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name and describe 3 smart polymers: |
light sensitive plsters: top layer of plasater pleeled back. lower layer now exposed to light. adhesive loses stickness peels easily off the skin.
Hydrogels: have cross linking chains that trap water. act as wound dressings. let body heal. good for burns. Shape memory: wound is stiched. temp of body makes the thread tighented. closes the wound up. |
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nmb, |
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