1. Name four natural polymers:
2. Hydrocarbons consists of elements _______________and ____________.
3. Ethylene(C2H4) is a ________________at ambient temperature but when reacted under
appropriate conditions it will transform to ___________________which is a solid polymeric
material.
4. What is the trade name for polytetrafluoroethylene (PTFE)?
5. Show the generalized form of representing a polymer:
6. Give two examples of linear polymers:
7. What kind of molecular structure Bakelite has?

8. Polymer molecules maybe characterized in terms of their size, shape, and ___________.
9. If a polymer has 2 repeat units in its unit cell, its repeat unit molecular mass is 31.5 g/mol, and
the unit cell volume is 10.2×10-23cm3
, calculate the density of a totally crystalline structure (ρs) of
this polymer.

10. In the above problem (Item numbered 9), if ρa= density of the totally amorphous polymer =
0.882 g/cm3
and ρs= density of the polymer=0.899 g/cm3
, what is the percent crystallinity (%
crystallinity) of the polymer.

DETAILED ASSIGNMENT

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