Polymers Flashcards

1
Q

Describe a polymer

A

Many small monomer that have joined together to make long chains

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2
Q

What type of bonding holds the atoms together in a polymer?

A

Covalent

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3
Q

What causes polymers to have different structures?

A

They are formed under different conditions, e.g. different temperature or pressure.

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4
Q

Describe the structure of HDPE (high density polyethene)

A

Long, straight chains (no branches) that can pack closely together

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5
Q

Describe the structure of LDPE (low density polyethene)

A

Long, branched chains that can’t pack closely together

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6
Q

Explain why a thermosoftening plastic can be remoulded when heated

A

The chains have weak forces between them so they can slide over each other

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7
Q

Explain why a thermosetting plastic can not be remoulded, even when heated.

A

The chains have strong cross-links between them which stops them from sliding over each other

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