Polymers Tut 1

1. What is a monomer?
1. A monomer is a small molecule that will covalently bond with itself over and over, making a very large molecule.

2. What is a polymer?
2. A polymer is the name given to the large molecule that monomers make; composed of smaller monomer units.

3. What is polymerisation?
3. This is the name for the actual chemical reaction that monomers undergo as they bond to make polymers.

4. What is another name for a synthetic polymer?
4. plastic

5. What is addition polymerisation?
5. type of polymerisation where alkenes (such as ethene) is the monomer. Hence the term addition.

6. What are the by-products in addition polymerisation?
6. there are no by-products

7. Ethene is a monomer in addition polymerisation. Draw a few separate ethene molecules.

8. Polyethene is the actual polymer formed. Draw polyethene.

Notice that although the name is polyethene, there are no double bonds in polyethene.

9. What is condensation polymerisation?
9. This is a reaction of two different monomers (small molecules), with different functional groups, and they undergo a condensation reaction, with the loss of small molecules, usually water.

10. What is a condensation polymer?
10. This is the actual polymer (very large molecule).
It is formed by two monomers with different functional groups, that are linked together in a condensation reaction in which a small molecule, usually water, is lost.

11. A condensation polymerisation reaction would involve monomers that are a diol alcohol and a dicarboxylic acid, such as :
• ethan-1,2-diol
• dipropanoic acid

Draw each of these molecules.


dipropanoic acid

12. What are the typical products formed when an alcohol reacts with a carboxylic acid?
12. ester and water

13. What is the name of the polymer formed when ethan-1,2-diol (diol alcohol) reacts with dipropanoic acid?
13. polyester

14. Draw the polyester molecule.

15. Name the by-product in the formation of polyester.
15. water

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