Stock forms of polymers Flashcards
1
Q
List the 6 stock forms of polymers
A
granules sheet film rods and other extruded forms foam powder
2
Q
How are the majority of polymers made?
A
via fractional distillation of crude oil (- non-renewable)
3
Q
True or false: polymers are self finishing
A
true
4
Q
What is a thermoplastic?
A
material can be reheated and reshaped repeatedly = recyclable
5
Q
What is a thermoset plastic?
A
undergoes chemical change when heated whereby molecules form rigid cross-links
cannot be reheated or reshaped
6
Q
What is an elastomer?
A
can be deformed under pressure at room temperature, and the, upon release, will return to its original shape
