杂环芳香族聚酰胺纺丝原液孔口胀大效应的研究

采用摄影法研究了杂环芳香族聚酰胺纺丝原液的孔口胀大效应。结果表明:杂环芳香族聚酰胺纺丝原液在喷丝头挤出时会发生孔口胀大现象,在纺丝原液比浓对数黏数为4.20 dL/g,温度20～65℃,挤出压力0.25～0.45 MPa,喷丝孔长径比为1～7,滤布层数为1的条件下,纺丝原液的孔口胀大比为1.089 0～1.344 8;纺丝原液的孔口胀大比随着原液温度的上升、毛细管长径比的增大和滤布层数的增加呈逐渐减小趋势,随着聚合物相对分子质量的增大和挤出压力的增加呈逐渐增大趋势;纺丝原液的孔口胀大活化能随挤出压力的增加而增大。

Die-swell behavior of heterocyclic aromatic polyamide spinning solution

The die-swell behavior of heterocyclic aromatic polyamide spinning solution was studied by photography.The results showed that the die-swell behavior of heterocyclic aromatic polyamide spinning solution occurred as extruded from spinneret;the die-swell ratio of the spinning solution was 1.089 0-1.344 8 under the conditions as followed: logarithmic viscosity number of spinning solution 4.20 dL/g,temperature 20-65 ℃,extrusion pressure 0.25-0.45 MPa,length-diameter ratio of spinneret hole 1-7,filter cloth layer number 1.The die-swell ratio of the spinning solution gradually decreased while increasing the spinning solution temperature,capillary length-diameter ratio and filter cloth layers and gradually increased while increasing the relative molecular mass of polymer and extrusion pressure;and the die-swell activation energy of the spinning solution increased with the increase of extrusion pressure.