The viscoelastic properties nylon 6 fibers are studied in terms of stress relaxation and dynamic mechanical analysis. Single fibers are subjected to tensile stress relaxation tests at room temperature in air and water after rapid straining to between 5 and 40/100; the duration of these tests is between 0.1 to 10~5 seconds. Dynamic mechanical tests are done on a Rheometrics dynamic tester at frequencies between 0.1 to 10 Hz and at various static prestrains. Results are compared with those from similar tests in com- pression on waddings made of corresponding fibers. In general, correlations are good between fiber properties and wadding properties.
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