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Created by fampulli over 6 years ago


Rough notes on plastics- GCSE Resistant materials

Resource summary

1 most are synthetic materials
1.1 man- made, using chemical processes
2 two types
2.1 thermo-plastics
2.1.1 get soft when heated, allowing their shape to change- will harden in new shape
2.1.2 flxible
2.1.3 most, plastics- available in sheets (which can be heated and formed) (bathtubs are made from vacuum forming)and powders injection moulding
2.1.4 hundreds of diff types acrylic rigid and clear with good impact resistance nylon clothes bearings gears polypropylene medical syringes rope crates storage boxes
2.2 thermo-sets
2.2.1 once formed, cannot be changed using heat
2.2.2 hard and rigid
2.2.3 products that are heat-resitant and keep shape urea formaldehyde elec sockets melamine formaldehyde hard, rigid and strong- plastic bowls, laminated surfaces exoxy resin and polyester resin reinforced with glass fibre- canoes good chem resitance, but can be brittle
2.2.4 are normally available as different chemicals to mix together cannot normally be recycled
3 most made form crude oil
3.1 drilling deep into ground/ sea
3.2 broken down into simple parts: monomers
3.2.1 attached together to form polymers: the pure form of any plastic
3.3 non-renewable
3.4 pollution and damage to environment
3.5 plastics often end up buried in landfill- and they take 100s of years to break down- so this is a problem
3.6 but some are made form bio-degradable sustainable sources
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