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  • Created by: ellxe
  • Created on: 22-04-16 16:57
What are polymers?
Formed when lots of small molecules called monomers join together. Reaction called polymerisation - usually needs high pressure and a catalyst. Plastics are polymers.
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How are addition polymers made?
From unsaturated monomers. They have a double covalent bond. Molecules with at least one double bond between carbon atoms are called unsaturated. Alkenes, for example, can open up their double bonds to form chains - called addition polymerisation
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How do you name a polymer?
Simple. Name of monomer, with poly in front of it
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What properties of plastic do weak forces make?
Long chains with weak intermolecular forces mean the chains are free to slide over each other - plastic can be stretched easily and has a low melting point.
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What properties of plastic do strong forces make?
Stronger bonds between the polymer chains could be covalent bonds or cross-linking bridges. They have higher melting points and are rigid and can't be stretched.
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How do polymer's properties determine what they're used for?
Strong, ridgid = milk bottles. Light, stretchable = plastic bags/squeezy bottles - not good for anything hot. PVC = Window frames and piping(rigid) synthetic leather(stretchy). Polystyrene = packaging
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What is nylon and what properties do the clothes made from it have?
Synthetic polymer. Not waterproof on their own, but can be coated with polyurethane to make tough, hardwearing and waterprrof outdoor clothing that doesnt let in UV light.However, doesnt let water vapour pass out. Sweat condenses + gets uncomfortable
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What is GORE-TEX?
It has all the useful properties of nylon/polyurethane but is also breathable. water vapour can escape.
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How do non-biodegradable plastics cause disposal problems?
Don't rot. Fill up landfill sites and when burned they release sulfur dioxide, poisonous hydrogen chloride, hydrogen cyanide. Best is to reuse and recycle.
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Other cards in this set

Card 2

Front

How are addition polymers made?

Back

From unsaturated monomers. They have a double covalent bond. Molecules with at least one double bond between carbon atoms are called unsaturated. Alkenes, for example, can open up their double bonds to form chains - called addition polymerisation

Card 3

Front

How do you name a polymer?

Back

Preview of the front of card 3

Card 4

Front

What properties of plastic do weak forces make?

Back

Preview of the front of card 4

Card 5

Front

What properties of plastic do strong forces make?

Back

Preview of the front of card 5
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