20. Polymers I: Chains and Molecules Flashcards
1
Q
Define polymer
A
a long chain molecule made up of repeating units
2
Q
Define plastics
A
synthetic or semi-synthetic polymers
3
Q
Which is bigger: the number average or the weight average molcular weight?
A
weight average molecular weight is always larger
4
Q
What does the degree of polymerization represent?
A
the average number of mer units in a chain
5
Q
a higher degree of polymerization mean ____ melting point, ____ stiffness, and ____ strength
A
higher
increased
increased
6
Q
less branching = _____ (worse/better)packing = _____ (weaker /stronger) interactions = ____ (weaker/stronger) material = ____ (less/more) ductile material
A
better packing
stronger interactions
stronger material
less ductile material
