polymers. students should be able to : define polymers distinguish between addition and...
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Polymers Polymers
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C.X.C objectives Students should be able to : Define polymers Distinguish between addition and condensation as reactions in
the formation of polymers Name examples of polymers formed by: (i) addition reactions (ii)condensation reactionso Draw diagrams to represent the formulae of monomerso State at least one use of each of the following types of polymers :
(i) polyalkene (ii) polyamide (iii) polyester (iv) polysaccharideo Show how the monomers are linked in the structure of a polymer o Demonstrate the differences in properties between a monomer
and the polymer it forms.
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Mind Map
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Polymers Obj 1. Students should be able to define polymers :
What is a polymer ?
Polymers are macromolecules formed by linking together thousands of small molecules called monomers, usually in chains. Polymers are formed by polymerisation.
Some polymers occur naturally whereas some are man-made (synthetic). Synthetic polymers are referred to as Plastics but will be further discussed later in this module.
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Polymerisation Obj. 2. Distinguish between addition and condensation as
reactions in the formation of polymers.
Polymerisation is the process whereby a polymer is formed from monomers. This can happen in two ways.
Addition Polymerisation
Condensation Polymerisation
Occurs when unsaturated monomers are linked to form a saturated polymer.
Occurs when monomers join with the elimination of a small molecule e.g. water from between each unit.
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Addition Polymerisation
An addition polymer is constructed of one type of monomer. This is an unsaturated molecule (usually an alkene C C )
Addition polymers are referred to as Polyalkenes.
The polymer is formed when the double bond breaks and the units join together .
Only one type of product is formed.
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Naming Polymers
To name a polymer, the prefix ‘Poly’ is placed before the name of the monomer.
For example: Polypropene Polystyrene Polyethene
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Addition Polymers
Polyalkenes have properties of substances commonly named PLASTICS. Plastics are synthetic polymers.
Name of Polymer Uses
Polythene Packaging, plastic bags, plastic wraps.
Polyvinylchloride Raincoats, plumbing fittings, water pipes, insulation of electric wires.
Polypropene Plastic containers, food containers, coolers.
Teflon Non-stick coatings for irons and pots.
Perspex Glass substitute in aircraft windows, reflectors on vehicles and sign boards.
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Condensation Polymerisation
Condensation polymerisation describes a process whereby the polymer is formed when monomer units join together with the elimination of a small molecule, usually BUT NOT ALWAYS water. (HCl or NH3 could be eliminated as well.)
In order for monomers to form condensation polymers, the monomer must have two active sites ( point at which the monomers join).
Two products are formed as a result of this type of polymerisation.
It is important to note that a condensation polymer can have monomers of one or two types.
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Condensation Polymerisation
There are two types of condensation polymerisation.
Natural Condensation polymers e.g protein and
starch
Synthetic or man-made
condensation polymers e.g.
nylon and terylene
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Types of linkage
Condensation polymers can be divided into groups based on the type of linkage between the monomer units.
Polyamides – Amide Linkage Polyesters- Ester Linkage C O
Polysaccarides- Saccaride Linkage O
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Types of condensation polymers
Polyamides
Polyesters
Polysaccharides
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Polyamides
Protein is a natural polyamide. The monomers which make up proteins are amino acids.
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Polyamides cont’d :
Two amino acids join together to form a dipeptide. A ‘H’ from the amine ( NH2) group of one of the amino acids and an ‘OH’ from the other amino acid condense to form water and join the two monomers.
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Polyamides cont’d:
Nylon is an example of a synthetic polymer. Nylon is special in that it is formed by two different monomers, a diacid and a diamine.
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Polyesters Polyesters are synthetic fibres, such as terylene,
made as imitations of natural materials like wool and cotton.
Polyester structure consist of many monomers joined together by ester bonds.
The monomers in polyester are : diacid + dialcohol
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Polysaccarides
Polysaccarides are natural polymers such as starch and cellulose. The monomers are monosaccarides e.g. fructose or glucose (simple reducing sugars)
Two glucose units join together by the elimination of water to produce a disaccaride (sucrose) and many glucose units join together to form the polysaccaride- starch.
Starch- [ O X O X O ] n
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Polysaccarides
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Uses of condensation Polymers Type of Polymer
Monomer Example Uses
Synthetic Polyamide
Diacid Diamine
Nylon Fibres for clothes, ropes, nets, fishing lines
Protein Amino Acids Keratin For growth and repairs of tissues, muscles, hair, nails and enzymes in living organisms
Polyester DiacidDialcohol
Terylene Fibres for clothing, boat sails and fishing lines
Polysaccarides Monosaccarides Starch Food reserves in plants, food source of animals
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Hydrolysis
Hydrolysis of Polymers-
The word ‘hydrolysis’ means to split up by the addition of water. Hydro- water, lysis-to break up/separate.
Polymers which undergo hydrolysis are broken up into their respective monomers when water is added.
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Hydrolysis
Carbohydrates and Proteins can be hydrolysed in two ways.
1) In the body during digestion by enzymes.
2) In the lab, by boiling with dilute Hydrochloric acid or sulphuric acid.
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Properties of Monomers and Polymers
Polymers tend to have totally different physical and chemical properties from their monomers.
Polymer Monomer
Chemical Properties Physical Properties
Starch Glucose Starch turns iodine blue/black.Glucose does not.Glucose forms a brick-red precipitate with Benedict’s solution. Starch has no effect on this solution
Starch is insoluble in water. Glucose is soluble in water.
Polyethene Ethene Ethene decolorises bromine in the dark whilst polyethene has no effect on bromine
Ethene is a gas at room temperature whilst polyethene is a solid.
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Videos
The Polymer Party –
http://www.youtube.com/watch?v=SgWgLioazSo