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Fig. 7. A plot of normalized force against temperature for a sample of
Araneus MA silk held at an extension of 36%. The intercept of the
uncorrected plot is 0.2, indicating that for this sample approximately 20% of
the force is due to enthalpy. When corrected for the effects of thermal
swelling, the slope of the force–temperature plot decreases, and the
intercept rises to 0.30 for this silk sample, indicating that approximately
30% of the force is due to bond energy.
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