polymers Flashcards
theory
what plastic can be reshaped with heat?
thermoplastics
which plastic is easily recycled?
thermoplastics
which plastic is made from a resin and a catalyst
Thermosetting plastics
which plastic cannot be reheated and reshaped?
thermosetting plastics
which plastic is harder to recycle?
thermosetting plastics
what is a quality of elastomers?
they are elastic -like rubber
thermoplastics are held together by what type of force?
Van der Waal forces
what does the number one plastic mean?
PETE
what does the number 2 plastic mean?
HDPE
what does the number three plastic mean?
PVC
what does the number four plastic mean?
LDPE
what does the number 5 plastic mean?
PP
what does the number six plastic mean?
PS - polystyrene
what are some properties of acrylic
good electrical insulator
stiff, hard and durable
splinters and scratches easily
what does HDPE mean
high density polyethylene
what is the difference between HDPE and LDPE
LDPE is less impact resistant
what is an issue with HDPE
colour tends to fade over time
can break under stress
why is PET used for drinks bottles?
it is a good alcohol and oil barrier
it has high tensile strength
what are advantages of PVC?
good chemical and weather resistance
