Material Science Polymers Review

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10 Terms

1
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What does “poly” and “mer” mean?

Many and part

2
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What are the two types of polymerization?

Addition and condensation

3
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What are Thermoplastics?

Soften when heated and resolidify cooled with little to no cross linking.

4
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What are Thermosets?

Set into a solid form permanently when heated and can’t be softened by heat with lots of strong cross linking.

5
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Alkanes have ____ bonds in their chains

single

6
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Alkenes have ____ bonds in their chains

double

7
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What is Fractional Distillation?

A refining process that separates petroleum products by boiling point / molecular weight

8
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What is Cross-linking?

When strands of polymers are interconnected by covalent bonds or intermolecular bonds

9
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What is the structure and properties of HDPE?

Linear chains and crystalline structure, harder plastic and higher melting point

10
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What is the structure and properties of LDPE?

Branched chains and amorphous structure with a lower melting point