Viscoelastic Properties of Several High Polymers

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Abstract
The viscoelastic properties of viscose monofils differing in the degree of orientation were measured by means of the vibrating reed method within the frequency range from 20 to 100 cps. The frequency dependence as well as the orientation dependence of the modulus and viscosity coefficient were discussed and connected with the relaxation mechanism. It could be expected that the anomalous dispersion should occur at frequencies lower than 1 cps and at high frequencies such as 104∼106 cps, the former being due to the motion of secondary cross bonds permitting the chains to slip, and the latter to the motion of segments. In order to supplement the data which support this discussion, measurements were extended to Cellophane, films of cellulose acetate, and Celluloid, and also to films of synthetic high polymers such as Polycaprolactam and polyvinyl chloride. The latter two substances showed noticeably different dynamic properties from that of cellulose, and this could, assumably, be associated with the fact that they lack in crystallization.