Note in Fig. 10.9 that, as expected, the elastic modulus of the polymer decreases as temperature increases. Using the stress-strain curves given in the figure, make a plot of the modulus of elasticity versus temperature. Note that all curves start at the origin, and undergo a transition from linear elastic behavior to plastic behavior at a strain of approximately 4%. We can therefore estimate the elastic modulus from the slope of the curves up to 4% strain. The following table can be constructed:
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