New materials Lesson 19-21. Lesson objectives List the properties of ceramics, polymers and composites and discuss how they are useful (9Ha,Hb p. 92-5)

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Presentation transcript:

New materials Lesson 19-21

Lesson objectives List the properties of ceramics, polymers and composites and discuss how they are useful (9Ha,Hb p. 92-5) Describe how the properties of rubber can be modified (p.93) Explain why synthetic materials are often used instead of natural materials (p.93) Define composite materials (p.94)

Ceramics Very hard High resistance to corrosion High wear resistance Low density brittle Non-metals (clay) Used for many things

Making ceramics 1. Pick your clay 2. Chose your method hand Wheel throwing Mold 3. Dry 4. Glaze 5. Bake

Using Ceramics Cooking containers Industry Come are insulators Some are superconductors

Polymers and plastics Polymers: are long chains of atoms that repeat a pattern Monomer: the name given to the small pattern piece

Rubber Natural polymer Flexible Is collected from trees (sap) Soft and sticky when hot Hard and brittle when cold

Vulcanization- changed properties Adding sulphur to rubber and heating it changed the properties See page 92 Sulphur made cross links between the strands of rubber and made it more elastic, harder and stronger

Natural polymers Cellulose Protein molecules Starch molecules Silk (silk worms)

Synthetic polymers (oil) Plastics: form any shape Nylon- clothes, ropes, nets

Synthetic polymers Kevlar: five times stronger than steel woven to make bullet proof vests Motorcycle tires, boots, jackets, gloves and helmets

Uses of polymers: Bakelite THINK Bakelite was the first polymer to be used to make many different things With your partner Name five things in your home that are made from polymers Describe the properties which are important to their function

Composites (p.95) Materials made from two different materials Strong and light Fiberglass Kelvar and epoxy liquid Carbon fibre Carbon fibre and polymer Used for sports, sailboats, airplanes, bicycles, Can you think of any more?

Task Today: Complete the following pages in Chemistry booklet 2 Page (recall, matching) Pages 17-8 (reading and comprehension) This week practical lab – making polymers 9Hb- focus on disasters- read, discuss and answer questions