After heat-setting of PET woven fabric at different temperature

the dynamic mechanical properties of fabric sample and its warp- and weft yarns have been measured by means of Rheovibron DDV-II-EA Dynamic Viscoelastometer.It was found that the dynamic mechanics-temperature spectra of fabric and its yarns were completely different from that of original fibers. On the [E] -T curves exhibited [E] peak

the [E]max value exponentially decreased with increasing of heat-setting temperature and the position of [E]max shifted towards igher temperature. At the same timem on the E''-T curves appeared double loss-modulus peak. The activation energy difference of corresponding relaxa-tion transition was up to half order of magnitude. A tentative analyse has been made to explain above mentioned phenomena. It was consi-dered that such phenomena were directly related to the weaving process and the condition of heat-setting.