Testing and analyzing microstructures and mechanical properties of T800 elastic yarn

The microstructures and mechanical properties of the latest T800 elastic yarn were studied. Cross section and longitudinal surface were observed by SEM. Nicolet 5700 IR spectrography was used to test the IR spectrogram of T800 filament,which indicated the elements of I,Cl,F and N were included,but the regular PET macromolecular chain contains only three elements C,H,O. Then DSC was employed to test the fiber' s crystallinity of 5. 8%,and it could be extrapolated that the fiber macromolecule,matrix fibrils' arrangement wasn' t very regular, with many large crevice holes. Meanwhile,comparison of tensile strength and elasticity was conducted between three kinds of T800 with different linear densities,and it was found that the smaller the linear density,the greater the tensile strength and elasticity. Examination of the microstructure and mechanical properties of the three kinds of T800 elastic yarn showed that the T800 elastic yarn with a linear density of 8. 33 tex has the best comprehensive properties.