Polymers Flashcards
What are the two main types of polymers
Thermoforming and thermoseting plastics
How do thermoforming plastics get formed
By heating melting and remoulding
How do thermoforming plastics get recycled
Ground down melted and Re uesed
What are the properties and uses for acrylic (pmma)
They are hard stiff and shiny. Resists weather well. Used for motercycle helmet visors . Brittle
What are the properties and uses for high density polyethylene (hdpe)
Stiff strong lightweight. Used for washing up baskets , water and gas pipes
What are the properties and uses for polyethylene terephthalate (pet)
Light strong tough. Used for drink bottles . Pet is a polyester
What are the properties and uses for high impact polystyrene (hips)
Ridged fairly cheap. Used for smoke detector casings
What are the properties and uses for polyvinyl chloride (pvc)
Quite brittle cheap durable. Used for window frames
What are the properties and uses for polypropylene (pp)
Quite tough flexible . Can be made with bright colours . Used for plastic chairs
Do thermosetting plastics resist heat and fire
Yes
What happens when thermosetting plastics undergo chemical changes when heated and mouleded
They permanently become hard and ridged
Are thermosetting plastics reyclble
No as they can’t be melted and re shaped again
What are the properties and uses for epoxy resin (er)
Ridged durable corrosion resistant and goo electrical insulater.
Used for circuit bordes
What are the properties and uses for urea formaldehyde (uf)
Hard brittle and good electrical insulator.used for plug sockets
What are the properties and uses for Melamine formaldehyde (Mf)
Strong scratch resistant.used for laminate chip bored
