1—THE DYNAMIC MECHANICAL PROPERTIES OF WOOL AT VERY LOW FREQUENCIES

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Abstract
The dynamic mechanical properties of wool in extension have been measured over a frequency range extending from 2 × 10−6 to 1·7 c/s, and under three different conditions of ternperature and regain. The results so far obtained suggest that increase in temperature has the same effect on the mechanical properties of wool as it has on those of other high polymers and that these effects are almost entirely the result of a plasticizing action. The effect of absorbed moisture appears to be more complex in that, while a plasticizing action is still the largest effect, the actual magnitude of the delayed elastic extension is apparently increased also, although to a much less extent than the reduction in internal friction.

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