Abstract
The relaxation behavior of wet-heat-treated fibers of poly(vinyl alcohol) was investigated. The ratio of the length of heat-treated fibers before and after heat-shrinkage occured with boiling the fiber in 20% of ammonium sulfate solution was obtained at various heat-treatment times and temperatures. The plots of heat-treatment time required to obtain a given ratio of shrinkage against reciprocal absolute temperature gave a straight line at various heat-treated temperatures. This result shows that the wet-heat-treatment is explained by the relaxation equation.
