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Thermoplastics - can be reheated and re-shaped - Coggle Diagram
Thermoplastics - can be reheated and re-shaped
raw materials for plastics
oil/coal/gas
crude oil goes through fractional distillation
problems with plastic
doesn't decompose ~ sent to landfill/burnt/thrown into the sea
releases harmful chemicals when burnt
producing plastics cause lots of pollution and wastes water
loose-chain molecules
polythene
high density polythene (HDPE)
tough and can be blow moulded, injection moulded, or extruded
low density polythene (LDPE)
made into thin film
ABS
strong, tough, scratch resistant and resists heat and chemicals
PVC
can be plasticised by different amounts for a wide range of products
polystyrene
light, transparent, but quite brittle
Polypropylene
versatile and flexible
acrylic (PMMA)
strong but scratches easily
nylon
hard and tough. resistant to wear
