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Textile Research Journal
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Below-Break Tensile Behavior of Irradiated Nylon

Part II : Gamma-Irradiated Nylon

Margaret I. Morton

Clot'ting and Textiles Department, University of Manitobi, Wimipig, Cinia, R3T 2N2

The air-dry and wet below-break tensile properties (tensile modulus, stress decay, and residual extension) of nylon 66 and nylon 6 were assessed at extensions of 2 and 5% after gamma radiation dosages ranging from 0 to 15 Mrad. Modulus increases were found for fibers extended in air subsequent to the irradiation; whereas in water, little change was evident. Slight improvements in stress decay and residual extension properties were noted from some of the irradiated fibers at ex tensions of 2% in air. Extension of the irradiated fibers to 5% in air and to 2 or 5% in water resulted in impairment of both properties. The property changes were considered to reflect internal structure modifications resulting from inter action with the radiation. Comparison of the results for the gamma-irradiated fibers with those obtained previously for ultraviolet-irradiated fibers suggested a greater influence of the crosslinking reaction on property changes of the ultra violet-irradiated fibers.

Key Words: Polyamide • nylon 6 • nylon 66 • aliphatic nylon. Radiation • gamma radiation • ultraviolet radiation. Degradation. Structural modification. Tensile properties • wet-fiber tensile properties • single-fiber tests • stress-strain properties. Stress decay • tensile modulus • permanent set • tenacity.

Textile Research Journal, Vol. 43, No. 8, 433-437 (1973)
DOI: 10.1177/004051757304300801
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