Polybutylene terephthalate(PBT)and polyamide 6(PA6)are used as raw materials,and PBT/PA6 blend fibers with a mass ratio of 70/30 are prepared by melt blending and spinning.The effects of water bath temperature and the...Polybutylene terephthalate(PBT)and polyamide 6(PA6)are used as raw materials,and PBT/PA6 blend fibers with a mass ratio of 70/30 are prepared by melt blending and spinning.The effects of water bath temperature and the drawing rate on the properties of the fibers are studied.The thermal properties and crystallization properties of PBT/PA6 blend fibers are investigated by means of polarized light microscope(POM),differential scanning calorimetry(DSC),thermogravimetric analysis(TG)and wide-angle X-ray diffraction(WAXS).The results show that,with the increase of the water bath temperature or drawing rate,the thermal and crystallization properties of the PBT/PA6 blend fibers increase to varying degrees.When the drawing rate is constant and the water bath temperature is increasing,the melting enthalpy,crystallization enthalpy,decomposition temperature(T a,T b)and crystallinity of the blend fibers all show an increasing trend.As the water bath temperature increased,the two-dimensional wide-angle X-ray diffraction(2D-WAXS)pattern of the blend fibers gradually change from the isotropic diffraction arc with low orientation to the diffraction arc,and finally become the diffraction spot with obvious orientation.When the water bath temperature is constant and the drawing rate is increased,the change trends of the melting enthalpy,crystallization enthalpy,initial decomposition temperature,midpoint decomposition temperature and crystallinity of the blend fiber firstly increase and then decrease.展开更多
基金Beijing Natural Science Foundation and Beijing Municipal Education Commission Science and Technology Plan Key Project,China(No.KZ201510012013)Beijing Institute of Fashion Technology Graduate Research and Innovation Project in 2019,China(No.120301990122/005)
文摘Polybutylene terephthalate(PBT)and polyamide 6(PA6)are used as raw materials,and PBT/PA6 blend fibers with a mass ratio of 70/30 are prepared by melt blending and spinning.The effects of water bath temperature and the drawing rate on the properties of the fibers are studied.The thermal properties and crystallization properties of PBT/PA6 blend fibers are investigated by means of polarized light microscope(POM),differential scanning calorimetry(DSC),thermogravimetric analysis(TG)and wide-angle X-ray diffraction(WAXS).The results show that,with the increase of the water bath temperature or drawing rate,the thermal and crystallization properties of the PBT/PA6 blend fibers increase to varying degrees.When the drawing rate is constant and the water bath temperature is increasing,the melting enthalpy,crystallization enthalpy,decomposition temperature(T a,T b)and crystallinity of the blend fibers all show an increasing trend.As the water bath temperature increased,the two-dimensional wide-angle X-ray diffraction(2D-WAXS)pattern of the blend fibers gradually change from the isotropic diffraction arc with low orientation to the diffraction arc,and finally become the diffraction spot with obvious orientation.When the water bath temperature is constant and the drawing rate is increased,the change trends of the melting enthalpy,crystallization enthalpy,initial decomposition temperature,midpoint decomposition temperature and crystallinity of the blend fiber firstly increase and then decrease.
