Which of the following would you expect to be elastomers and which thermosetting polymers at room temperature? Justify each choice.
(a) Linear and highly crystalline polyethylene
(b) Phenol-formaldehyde
(c) Heavily crosslinked polyisoprene having a glass transition temperature of 50°C (122°F)
(d) Lightly crosslinked polyisoprene having a glass transition temperature of -60°C (-76°F)
(e) Linear and partially amorphous poly(vinyl chloride)
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