Abstract
Poly (ethylene terephthalate) (PET) fabrics grafted with acrylic acid (AA) and methacrylic acid (MAA), especiálly its Na salt form, became hygroscopic. A wear comfortability under perspiration was expected from the view point of water transfer mechanism.
A relative humidity change within a microspace between clothes and skin was thus evaluated by a model apparatus. AA/MAA grafted PET (Na salt form), PET, cotton and PET/cotton blend were used as sample cloths.
As a result of the experiment, it became clear that with an increase in moisture absorbability of the sample cloths, a rising rate of relative humidity within the microspace became lower. The humidity change within the microspace under perspiration was presented by the following equation, where RH is a relative humidity (%) at time t (min.) and K is a rate constant.
K value for each material changed in 2-3min, and the value in the first period was higher than that in the latter period.
