Mechanical Properties of Urylon, a Polynonamethylene Urea Fiber.

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The mechanical properties, such as tensile stress strain, creep and recovery behaviors, of Urylon, a polynonamethlene urea fiber, have been experimentally studied and compared with those of other fibers which have been previously investigated by the author The tensile stress strain properties of Urylon can also be quantitatively represent by characteristic values, such as the first and secondary moduluses of elasticity, secondary yield point, yield elongation, tensile strength and total elongation. The total elongation due to a constant tensile stress consists of three types of elongation : (a) instantancous elongation εb, (b) first creep elongation εσ1, and (c) secondary creep elongation εσ2. εb is directly proportional to the tensile stress and inversely proportional to the first modulus of elasticity. εσ1 is directly proportional to the tensile stress and the logarithmus of the duration of loading, while εσ2 rises after some period of loading under some tensile stress and its amount is also proportional to the tensile stress and the logarithmus of the duration of loading. Similarly, recovery shrinkage due to unloading consists of three types of recovery shrinkage : (a) instantancous, (b) the first creep shrinkage and (c) secondary creep recovery shrinkage. One of the remarkable features of Urylon is a lack of yielding part's elongation in the stress strain curve or relaxative elongation in the creep curve, and these elongations arise from a hot- water treatment higher than 60°C. Another feature is that Urylon has the highest elasticity among such fibers as nylon, teryline, Kanekalon, vinylon, viscose rayon, acetate, bemberg, wool and cotton. Generally, the mechanical properties of Urylon are very similar to those of nylon.
社団法人日本繊維機械学会の論文

Mechanical Properties of Urylon, a Polynonamethylene Urea Fiber.

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