Group Members and the Materials

Group Members Materials

1.Ryan Teo

2.Shao Wei

3.Yong Ming

4.Daren Tung

1.Plastics

2.Glass

Plastic

sGlass

History of Plastics Humankind has been using natural plastics for

thousands of years.

It really all started in 1862 when Alexander Parkes

launched his invention “Parkesine” at the Great International Exhibition in London, England.

Early plastics based on natural products shared

numerous drawbacks. After World War II (1939-1945), new polymer discoveries accelerated.

Common Properties of Plastics light-weight, floats on water ( most but not all ) , waterproof, flexible, strong, durable, Transparent / translucent / opaque, poor conductor of heat, Does not conduct electricity, Not easily broken, not easily biodegradable (a material that can’t be destroyed by

natural processes) Non-magnetic

Uses of Plastics in the past• Bakelite – Plug covers, Handles of electrical

appliances and cooking utensils• Polythene – Shopping plastic bags, pails• PVC – Raincoats, umbrellas, water pipes• Nylon – Carpets, fishing nets• Polyethyelene (1950s) – Hula Hoop• Polypropylene (1953) – battery cases, tubes, • Teflon (1938) – Non stick cooking utensils• General – Disposable utensils ( Forks and Spoons ),

Toys

Uses of Plastics in the present• Automobile Industry

– Cars,– Buses,– Heavy machinary

• Aerospace Industry– Aeroplanes, – Helicopters, – Missiles, Rockets

• Health Industry– Medical instruments, Dental fillings, – Optical lenses, – Biocompatible joints ( To replace parts of the body during

surgery )

• Polystyrene – Boxes, Food containers, Styrofoam

History of Glass

Glass is thought to have been first created around 3000 BC, during the bronze age.

Egyptian glass beads date back to about 2500 BC. In the 1600s, a process whereby lead was added to

the glass mixture was patented. Venice was the world's major glass-making centre, as

it had been for 400 years since 1400AD. During the nineteenth century, basic methods of glass

production had not changed much.

Common Properties of Glass

Light Can be transparent ( eg: Clear Glass ) Can be translucent ( eg: Tempered Glass ) Can be colourful ( eg: Frosted Glass ) Can be hard It is fragile ( breaks easily )

It does not conduct electricity.

Uses of Glass in the past

• Windows,• Spectacle lenses,• Television Screen,• Kitchenware,• Bottles,• Fish Tanks,• Shower doors,• Table tops,• Ornaments,• Crystals

Uses of Glass in the present

• Optical Glass – microscopes, – telescopes, – cameras

• Glass Ceramics – space shuttle tiles, – rocket nosecones

• Glass Fibers• Glass bricks – hollow construction blocks

Sources

• http://www.britglass.org.uk/Files/SetGlassFactsheets.pdf• http://science.howstuffworks.com/plastic4.htm• http://encarta.msn.com/encyclopedia_761553604/Plastic

s.html#s29• http://encarta.msn.com/encyclopedia_761554489_9/

Glass.html

Thank You