羊毛繊維の水中における力学的挙動 : 高分子レオロジー
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The mechanical behavior of wool fiber in water is studied by the free damped vibrational method at low frequency (period=4~5 sec) and large amplitude (maximum amplitude=2% extension ) under various static strains and temperatures. In order to measure the stationary viscoelasticity, the logarithm of double amplitude must be decreased linearly with the vibration. In the case of wool in water, these straight lines (plots of logarithm of the double amplitudes (A_N) against successive vibration numbers (N) ) are concave or convex about the axis of the successive vibration number (N). There are three types of logA_N~N curves : Straight line and concave or convex against N-axis. The above three types are assumed as follows : (1) Straight line : The reformation of the secondary bonds are in equilibrium and a stationary state is attained. (2) Convex curve : The reformation of the secondary bonds exceeds the breaking during the vibration. (3) Concave curve : The breaking of the secondary bonds exceeds the reformation during the vibration. The above hypothesis may explain the mechanical behavior or wool in water at various conditions. This is shown as follows : 1. The wool fiber if extended in the state where the breaking of the secondary bonds exceeds the reformation of the bonds, but during retraction the reformation exceeds. The change of the viscoelasticity under extension and retraction is reversible within 0~30% extension region (Fig. 2~3).
- 社団法人日本材料学会の論文
- 1960-04-15
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