Polymers with different properties

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  • Created by: RGV17
  • Created on: 14-08-16 18:20
What are the reaction conditions of low-density poly(ethene)?
Temperature: 200 Degrees Celsius. Pressure: 2000 Atmospheric Pressure. Catalyst: Trace of Oxygen.
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What is the structure of a low-density poly(ethene)?
The molecules are highly branched; therefore loosely packed.
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What are the properties of a low-density poly(ethene)?
Flexible and Soft
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What are the uses of low-density poly(ethene)?
Bags, Cling and Film
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What are the reaction conditions of high-density poly(ethene)?
Temperature: 60 Degrees Celsius. Pressure: 2 Atmospheric Pressure. Catalyst: Ziegler- Natta (titanium based catalysts)
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What is the structure of a high-density poly(ethene)?
The molecules are less branched; therefore tightly packed (more rigid).
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What are the properties of a high-density poly(ethene)?
Stiffer and Harder
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What are the uses of low-density poly(ethene)?
Buckets and Bottles
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What are thermosoftening polymers?
Thermosoftening polymer chains are not joined to each other, they soften and melt on heating because there are weak forces between the polymer chains.
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What are thermosetting polymers?
Thermosetting polymer chains are joined to each other by strong covalent bonds called cross-links.
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Can thermosoftening polymers be recycled?
They can be recycled because they can be melted on heating and remoulded.
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Can thermosetting polymers be recycled?
They do not soften or melt on heating and so can't be recycled.
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Card 2

Front

What is the structure of a low-density poly(ethene)?

Back

The molecules are highly branched; therefore loosely packed.

Card 3

Front

What are the properties of a low-density poly(ethene)?

Back

Preview of the front of card 3

Card 4

Front

What are the uses of low-density poly(ethene)?

Back

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Card 5

Front

What are the reaction conditions of high-density poly(ethene)?

Back

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