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The adhesive bonds between a PVC coating and its fabric substrate are affected by the hydrophilic character of the material and the environmental condi tions under which the coating process is carried out. Work has been carried out at TEFO for the purpose of studying the influence of different sources of moisture on adhesion between PVC coating and substrates of polyester, nylon-based woven and knitted structures, and PES film. The results have been evaluated in accordance with the newly developed TEFO method for determining coating adhesion.

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The viscoelastic properties of 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%; the duration of these tests is between 0.1 to 105 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 compression on waddings made of corresponding fibers. In general, correlations are good between fiber properties and wadding properties.