Main factors affecting the low temperature plasma initia-tion and graft modification of acrylic acid onto polybuty-lene terephthalate(PBT)meltblown nonwovens are stud-ied.The relations between hydrophilic performance ...Main factors affecting the low temperature plasma initia-tion and graft modification of acrylic acid onto polybuty-lene terephthalate(PBT)meltblown nonwovens are stud-ied.The relations between hydrophilic performance ofthe product and plasma power,treating time,andmonomer concentration are investigated.The surfaceperformances of grafted products are analyzed.It is ob-tained that hydrophilic performance of PBT nonwovens isgreatly improved due to the etching of the plasma andthe introduction of polar groups so as to meet the needsof leukocyte depleting materials.展开更多
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
With the help of differential scanning calorimetry, cone-plate and capillary rheometry andscanning electron microscopy, a research has been conducted on rheological behavior,crystallization and morphology of poly (but...With the help of differential scanning calorimetry, cone-plate and capillary rheometry andscanning electron microscopy, a research has been conducted on rheological behavior,crystallization and morphology of poly (butylene terephthalate) (PBT) blends containing athermotropic LCP. The blend has zero entrance pressure loss, although the LCP has rather largeone. The viscosity curve of the blend lies between those of the LCP and PBT. The crystallizationof PBT is not affected by the presence of the LCP together with no indication oftransesterification between the two ingredients. LCP spheres and ellipsoids with the size of 0. 5--1. 5 μm disperse in PBT matrix uniformly, which is related to the viscosity ratio of the two components.展开更多
This study investigated the elastic elongation and elastic recovery of the elastic warp knitted fabric made of polyethylene terephthalate( PET) and polybutylene terephthalate( PBT)filament. The effect of knitting para...This study investigated the elastic elongation and elastic recovery of the elastic warp knitted fabric made of polyethylene terephthalate( PET) and polybutylene terephthalate( PBT)filament. The effect of knitting parameter on the elasticity of PBT /PET warp knitted fabric was analyzed. The increase of drawing density( from 16 to 26 courses per centimeter( CPC)) on machine resulted in the decrease of elongation at the weft direction. But,the elongation at the warp direction fluctuated as drawing density increasing. The yarn run-in speed influenced the elongation of PET /PBT warp knitted fabric as well. When the yarn run-in speed of GB1( front bar) was kept a constant,the increase of GB2( back bar) yarn run-in speed caused the gradual enhancement of the elastic elongation at the warp direction,but the different trends of the elastic elongation at the weft direction. When yarn run-in speed of GB2 was kept a constant,the increase of GB1 yarn run-in speed enlarged the elastic warp elongation from 104.16 to 124.97 mm,while the weft elongation decreased from 110.34 to 98.03 mm.Eventually yarn run-in speeds of GB1 and GB2 were retained at1 360 and 1 170 mm / rack respectively under 20 CPC drawing density. It could not only balance the two directions of elongation but also reach the highest elongation at both directions( 126. 32 and115.88 mm) under 100 N tension. These results provide a better understanding of characteristics of PET / PBT warp knitted fabric,and its elastic elongation and recovery behavior for development and effective applications.展开更多
基金Science and Technoloy Foundation of Municipal Education Commission Shanghai
文摘Main factors affecting the low temperature plasma initia-tion and graft modification of acrylic acid onto polybuty-lene terephthalate(PBT)meltblown nonwovens are stud-ied.The relations between hydrophilic performance ofthe product and plasma power,treating time,andmonomer concentration are investigated.The surfaceperformances of grafted products are analyzed.It is ob-tained that hydrophilic performance of PBT nonwovens isgreatly improved due to the etching of the plasma andthe introduction of polar groups so as to meet the needsof leukocyte depleting materials.
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.
基金Supported by the National Natural Science Foundation of China
文摘With the help of differential scanning calorimetry, cone-plate and capillary rheometry andscanning electron microscopy, a research has been conducted on rheological behavior,crystallization and morphology of poly (butylene terephthalate) (PBT) blends containing athermotropic LCP. The blend has zero entrance pressure loss, although the LCP has rather largeone. The viscosity curve of the blend lies between those of the LCP and PBT. The crystallizationof PBT is not affected by the presence of the LCP together with no indication oftransesterification between the two ingredients. LCP spheres and ellipsoids with the size of 0. 5--1. 5 μm disperse in PBT matrix uniformly, which is related to the viscosity ratio of the two components.
基金National Natural Science Foundation of China(No.51403080)Natural Science Foundation of Jiangsu Province,China(No.BK20140161)Innovation Fund Project of CIUI(Cooperation among Industries,Universities & Research Institutes)of Jiangsu Province of China(No.BY2015019-20)
文摘This study investigated the elastic elongation and elastic recovery of the elastic warp knitted fabric made of polyethylene terephthalate( PET) and polybutylene terephthalate( PBT)filament. The effect of knitting parameter on the elasticity of PBT /PET warp knitted fabric was analyzed. The increase of drawing density( from 16 to 26 courses per centimeter( CPC)) on machine resulted in the decrease of elongation at the weft direction. But,the elongation at the warp direction fluctuated as drawing density increasing. The yarn run-in speed influenced the elongation of PET /PBT warp knitted fabric as well. When the yarn run-in speed of GB1( front bar) was kept a constant,the increase of GB2( back bar) yarn run-in speed caused the gradual enhancement of the elastic elongation at the warp direction,but the different trends of the elastic elongation at the weft direction. When yarn run-in speed of GB2 was kept a constant,the increase of GB1 yarn run-in speed enlarged the elastic warp elongation from 104.16 to 124.97 mm,while the weft elongation decreased from 110.34 to 98.03 mm.Eventually yarn run-in speeds of GB1 and GB2 were retained at1 360 and 1 170 mm / rack respectively under 20 CPC drawing density. It could not only balance the two directions of elongation but also reach the highest elongation at both directions( 126. 32 and115.88 mm) under 100 N tension. These results provide a better understanding of characteristics of PET / PBT warp knitted fabric,and its elastic elongation and recovery behavior for development and effective applications.
