EDEXCEL GCSE DT: core 1.10 thermoforming and thermosetting polymers

What are the properties of polymers ?

heat insulators
electrical insulator
Toughness

What is a thermoforming polymer?

a material that can be reshaped by application of heat. This of material can be recycled type and made into other products.
made from loose molecules that have no fixed structure

Name 3 thermoforming polymers

Acrylic
High impact polystyrene (HIPS)
Biopol

advantages and disadvantages of acrylic

Advantages
- tough
- variety of colours
- widely available
Disadvantages
- brittle
- scratched easily

uses of acrylic

shop Signs
Baths

Advantages and disadvantages of HIPS

Advantages
- lightweight
- impact resistant
- stiff
Disadvantages
- brittle under uv
- low melting point
- scratches easily

Uses of HIPS

Children toys
TV parts

Advantages and Disadvantages of Biopol

Advantages
- good electrical insulator
- biodegradable
- lightweight
Disadvantages
- Expensive
- low resistance to impact

Uses of Biopol

razors
disposable cups
packaging
surgical stitches

What is a thermosetting polymer ?

a material that cannot be reshaped by reheating. This type of material cannot be recycled. Molecules are cross linked so rigid molecular structure

Give 2 examples of thermosetting polymers

Urea Formaldehyde
polyester resins

advantages and disadvantages of urea formaldehyde

Advantages
- good electrical and heat insulator
- Rigid
Disadvantages
- brittle

uses of urea formaldehyde

Electrical fittings, plugs and switches

Advantages and Disadvantages or polyester resin ?

Advantages
- good electrical and heat insulator
- chemical resistance
Disadvantages
- brittle
- can chip

uses of polyester resin

Boat hulls, sports car parts, decorative items