多重共轭静电纺纳米纤维的成纱工艺

Spinning Process of Multiple Conjugate Electrospinning Nanofiber Yarn

利用多重共轭静电纺纳米纤维成纱装置制备了连续的纳米纤维纱,并研究其成纱工艺,分析了电压、纺丝液流量等参数对纳米纤维和纱线的直径以及纱线拉伸性能的影响.研究结果表明:随着电压和正负针头纺丝液流量比的增加,纤维直径减小而纳米纤维纱的直径先增大后减小;随着纺丝液总流量的增加,纳米纤维纱的直径先急剧增加后保持稳定.纺纱电压为20kV,正负针头纺丝液流量比为5∶3,纺丝液总流量为6.4mL/h时,纳米纤维可稳定集聚和连续成束,加捻成纳米纤维纱.在卷绕速度一定时,随着喇叭转速的增大,纤维捻回角逐渐增大,且纱的断裂强度和断裂伸长率随着纳米纤维纱捻回角的增大而增大.在捻回角为40.7°时,纳米纤维纱的断裂强度和断裂伸长率分别为50.71MPa和43.56%.

Continuous nanofiber yarns are fabricated by the device of multiple conjugate electrospinning nanofiber and the spinning process is studied. The influence of voltage and flow rate of spinning solution to the diameter and tensile properties of nanofiber and yarn is discussed. The research results reveal that the diameter of nanofiber reduces as well as the diameter of yarn increases firstly and then decreases with the increase of applied voltage and flow rate ratio of spinning solution of positive and negative needle. With the increase of overall flow rate of spinning solution, the diameter of nanofiber yarn increases dramatically and then remains stable. Nanofiber can be stably agglomerated and continuously bundled then twisted into nanofiber yarns,in conditions of applied voltage is 20 kV and flow rate ratio is 5 ＂ 3 as well as overall flow rate of spinning solution is 6.4 mL/h. With an increase in the funnel rotate speed when the take-up speed is constant, the twist angle of nanofiber yarn gradually enlarged. The yarn breaking tensile strength and elongation show increased trend with the increase of the twist angle. When the twist angle is 40.7~, the yarn tensile strength and elongation at break are 42.0 MPa and 43.56%, respectively.