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notes on moulding

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Akbar Rahman
2022-03-01 22:21:01 +00:00
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uni/mmme/1029_materials_and_manufacturing/materials.md
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@@ -318,6 +318,19 @@ They are made of long carbon-carbon chains.
![](./images/vimscrot-2021-11-01T11:13:39,370133338+00:00.png)
## Industrially Important Polymers
The worldwide production of polymers in 2019 was $368\times10^6$ tonnes and the majority is from
just 5 polymers:
- Polyethylene (PE) --- wire insulation, flexible tubing, squeezy bottles
- Polypropyene (PP) --- carpet fibres, ropes, liquid containers, pipes, chairs in Shoreham Academy
- Polyvinyl chloride (PVC) --- bottles, hoses, pipes, valves, wire insulation, toys
- Polystyrene (PS) --- packaging foam, egg cartons, lighting panels
- Polyethylene terephthalate (PET) --- carbonated drinks bottles
All of these materials are low cost.
## Thermoplastics
The simplest polymer is poly(ethene):