Logarithm of the relaxation modulus versus temperature for crystalline isostatic (curve A), lightly crosslinked atactic (curve B), and amorphous (curve C) polystyrene is depicted at the figure below. Relaxation modulus, E,(10) (MPa) 104 103 10² 10 1 10-1 10-2 10-3 50 Temperature (°F) 150 200 250 300 350 400 450 To 100 150 Temperature (°C) A B C 200 106 105 104 10³ 10² 10 1 250 Relaxation modulus (psi) With the help of this figure choose schematic strain-time plots for the following polystyrene materials at the specified temperature: Amorphous at 180°C

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