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Main Engineering Materials - Coggle Diagram
Main Engineering Materials
Polymers
Manufactured Polymers
Plastics that have been made from petroleum oil.
Thermoplastics
Polymers that can be softened and heated and moulded into shape. They harden again once cooled. This can be repeated many times and the plastic will try to return to its original shape (plastic memory). Recyclable.
Thermosetplastics
These polymers undergo a chemical change once heated. Once they have cooled and set they cannot be remoulded, so cannot be recycled.
Definition
A very large chain like molecule made up of smaller molecules called monomers. Polymers can be found naturally (silk, wool, hair) or manufactured (nylon, acrylic)
Polymer Properties Research
Acrylonitrile- Butadiene- Styrene (ABS)
Polyethylene
High-Density
Properties
Sinks in water
Resistance to moisture
Permeability to gas
Semi-rigid
Low-Density
Properties
Not crinkly
Ease of processing
Ease of sealing
Barrier to moisture
Flexible
High Impact Polystyrene (HIPS)
Polyvinyl Chloride (PVC)
Properties
Glossy
Sinks in water
Semi-rigid
Nylon
Properties
Fibres also absorb little watermelon water, making clothing easy to wash and dry
Wrinkle Resistant
Durable
Fibres are very strong, fairly elastic and lustrous
Polycarbonate
Polypropylene
Properties
Low gross
Resistance to heat, chemicals, grease and oil
Versatile barrier to moisture
Semi-rigid
