topic 1.3 Flashcards
(27 cards)
What are the three key categories of polymers?
- Thermoplastics
- Thermosetting Plastics (Thermosets)
- Elastomers
What is a characteristic of thermoplastics?
Can be reheated and reshaped multiple times
List two properties of Acrylic (PMMA).
- Hard
- Shiny
- Good optical clarity
- Brittle
What are common uses of Polypropylene (PP)?
- Chairs
- Food containers
- Hinges
What is a key feature of thermosetting plastics?
Permanently set after heating
Name an example of a thermosetting plastic.
Melamine Formaldehyde
What is a property of Epoxy Resin?
Strong, chemical-resistant, adhesive
What are the common applications of Natural Rubber?
- Tyres
- Seals
- Footwear
Define toughness in relation to polymer properties.
Resists impact – good for durable products
What is the role of plasticisers?
Improve flexibility
True or False: Thermoplastics can be recycled.
True
What is a characteristic of biopolymers?
Made from renewable sources and biodegradable
Fill in the blank: Most polymers are _______ and take centuries to break down.
non-biodegradable
What is the purpose of flame retardants in polymers?
Reduce flammability
List two forming techniques for thermoplastics.
- Injection Moulding
- Blow Moulding
What process is used for creating hollow items?
Blow Moulding
What are common products made from HDPE?
- Detergent bottles
- Crates
What is the significance of low thermal conductivity in polymers?
Makes them suitable for handles and insulators
What is the primary use of Urea Formaldehyde?
Electrical fittings and switches
What does the term ‘degradable polymers’ refer to?
Polymers that contain additives to break down faster in light/oxygen
Name a common application of Acrylic.
- Shop signs
- Display stands
- Bath tubs
What is a property of silicone?
Flexible, thermal and chemical resistant
List two properties of Polyester Resin.
- Rigid
- Brittle
- Good chemical resistance
Fill in the blank: The process of _______ is used for continuous lengths of thermoplastics.
Extrusion
