Below are shown and labeled by letter several schematic stre

Below are shown and labeled (by letter) several schematic stress-strain curves that may be displayed by polymeric materials at room temperature. Indicate, by letter, the stress-strain behavior expected for each of the following polymers: Lightly crosslinked polyisoprene Heavily crosslinked polyisoprene Linear polyethylene Network phenol-formaldehyde

Solution

Lightly crosslinked polyisoprene C

Heavily crosslinked polyisoprene curve A because it will be brittle and qiute stiff due to its high degree of crosslinking

Linear polyethylene B

Network phenol formaldehyde C