polymers. students should be able to : define polymers distinguish between addition and...

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Polymers Polymers

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Page 1: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

Polymers Polymers

Page 2: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 3: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

Mind Map

Page 4: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 5: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 6: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 7: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

Naming Polymers

To name a polymer, the prefix ‘Poly’ is placed before the name of the monomer.

For example: Polypropene Polystyrene Polyethene

Page 8: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 9: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers
Page 10: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 11: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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

Page 12: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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

Page 13: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

Types of condensation polymers

Polyamides

Polyesters

Polysaccharides

Page 14: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

Polyamides

Protein is a natural polyamide. The monomers which make up proteins are amino acids.

Page 15: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 16: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 17: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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

Page 18: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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

Page 19: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

Polysaccarides

Page 20: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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

Page 21: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 22: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 23: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

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.

Page 24: Polymers.  Students should be able to :  Define polymers  Distinguish between addition and condensation as reactions in the formation of polymers

Videos

The Polymer Party –

http://www.youtube.com/watch?v=SgWgLioazSo