Structure and Properties of Polymers Worksheet

Question 1

What makes a small starting molecule a monomer in polymer production?

1. It forms a repeating part of a polymer chain.
2. It must be a single atom.
3. It dissolves all polymers.
4. It stops a chain from forming.

Question 2

Explain why adding cross-links can make otherwise similar polymer chains less able to slide past one another.

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Question 3

In otherwise similar polyethylene samples, extensive branching prevents chains from packing tightly. Which feature directly changes?

1. The number of protons in each carbon atom
2. The average spacing between neighboring chains
3. The sign of the charge on every carbon atom
4. The number of valence electrons in a neutral hydrogen atom

Question 4

Explain why identifying the repeating unit alone may be insufficient to predict a polymer sample’s stiffness.

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Question 5

Which strap is stiffest under the load used?

1. A
2. B
3. C
4. The straps have equal stiffness.

Question 6

A strap must extend at least 10 mm but no more than 15 mm under the tested load. Select a strap and use the measurements to justify your choice.

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Question 7

Describe the pattern in the measurements and connect it to how cross-links affect chain motion.

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Question 8

Which additional measurement would allow the team to compare the loads the straps can withstand before breaking?

1. Initial strap length
2. Load at break for each strap
3. Extension under the original load only
4. Color after unloading