Abstract
By use of methods of nonstationary heat flow, thermophysical characteristics (thermal conductivity, λ, thermal diffusivity,a, and specific heat capacity, C) have been obtained and the character of the temperature dependence, λ=f(T), has been established for a yarn-air composite system with a parallel disposition of elementary filaments. The character of the temperature dependence, λ=f(T), is supported by the results of studies of PA yarn-air composite systems having an unordered disposition of the elementary filaments, which were obtained by the method of a stationary heat flux. The dependence of the change in specific heat capacity coefficient of a composite system with an unordered disposition of elementary filaments on temperature, C = f(T), has been determined by the nonstationary heat flux method. Equations for the temperature dependences of the coefficient of specific heat capacity and the thermal conductivity coefficient of PA complex yarns have been obtained in the temperature range from 300 to 423 K.
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