End Of Topic Test 1 LH

Question 1

What are the 4 main mechanical properties and describe them?

Answer 1

Toughness, Flexibility, Elasticity, Mouldability

Question 2

What is Vacuum Forming?

Answer 2

Simplest type of plastic thermoforming that uses one mold and vacuum pressure to obtain desired parts.

Question 3

What are 7 of the main physical properties of polymers?

Answer 3

Thermal/Electrical insulation, melting point, UV resistance, Chemical resistance, Transparency, Translucency, etc

Question 4

What is the difference between a physical and mechanical property?

Answer 4

Physical can be measured (Celsius) , Mechanical display to external forces.

Question 5

What are the two main types of polymers?

Answer 5

Thermosetting (ordered structured chains) and Thermoplastics (long chains randomly tangled).

Question 6

What are plastics made from?

Answer 6

Oil using fractional distillation.

Question 7

What is cracking?

Answer 7

Hydrocarbons breaking into smaller hydrocarbons.

Question 8

What is a Polymer?

Answer 8

Polymers are the building blocks of all plastics.

Question 9

Whats the differences between thermosetting and thermoplastics?

Answer 9

Thermosetting = USUALLY NOT RECYCLABLE, more brittle, hard, waterproof when solid, idea for use as adhesives. More difficult to mould, suitable for stiffer moulding.

Thermoplastics= USUALLY RECYCLABLE, tough, commonly chemical resistant, etc.

Question 10

Name 4 additives?

Answer 10

Fillers, Plasticisers, lubricants, UV light stabilizers, Thermal Antitoxants, Bio-Batch Material.

Question 11

What are the benefits of 4 additives you’ve just named?

Answer 11

Plasticizers = Makes Materials Stretch/flow.
Thermal Antioxants = Prevents Oxidation due to heat exposure.
UV light Stabilisers = Improve materials resistance to degradation by UV light.
Lubricants = Reduces Friction between surfaces.

Question 12

What is an Elastomer?

Answer 12

A polymer which is highly elastic and capable of recovering their original shape after being stretched.

Question 13

What is Overmoulding?

Answer 13

An injection moulding process where two or more components are moulded on top of each other.

Question 14

What is Vulcanisation?

Answer 14

Process > To Cure Rubber making it harder, more durable and heat resistant.

Question 15

What is Polybutadiene?

Answer 15

> Strong, synthetic rubber which is highly resistant to wear. Its thermoresistance against friction is used in products like racing car tyres.

Question 16

What is Degradible and what is Biodegradible?

Answer 16

Breaks down very slowly into tiny particles which remain, pollute and can get into the food chain.

Decompose due to presence and action of living organisms.

Question 17

What does compostable mean?

Answer 17

Breaks down under specific conditions.

Question 18

Biopolymers/Biodegradible polymers fall into two main categories?

Answer 18

Renewable raw materials (eg sugar)

Manufactured from petrochemicals with the addition of biodegradable additives (bio batch) which aid degradation.