熔体电纺直写技术的成型工艺精度

Precision of Molding Process of Melt Electrospinning Direct Writing Technology

有序沉积是许多微纳米纤维实现应用的前提条件,为了研究电场下纤维单层沉积的误差以及双层沉积的精度,使用生物可降解材料聚己内酯(PCL),采用自主设计的微纳三维可控成型设备进行直写电纺实验,考察了接收距离、纺丝电压对重复路径可控成型精度的影响,以及纤维间距对熔体电纺并行路径可控成型误差的影响。结果表明,随着纺丝距离的增大,纤维的可控性下降,重复路径的偏移距离增大,当接收距离为7mm时,偏移距离达到1.1mm;随着电压的增加,纤维在重复路径上的偏移距离增加,电压为30kV时,偏移距离为0.6mm;此外,随着并行纤维设定距离的增大,纤维的沉积误差起初快速减小,随后下降速度大幅降低,并最终趋于平稳。

Ordered deposition is a prerequisite for many micro-nanofiber applications.In order to study the error of fiber monolayer deposition under electric field and the precision of double layer deposition,the biodegradable material polycaprolactone(PCL)and self-designed micro-nano three-dimensional controllable molding equipment controlled molding equipment were used for direct writing electrospun experiment.The effects of receiving distance,spinning voltage on the controllable molding accuracy of repeated path and the effects of fiber spacing on the controllable molding error of the parallel path of melt electrospinning were investigated.The results showed that with the increase of the spinning distance,the controllability of the fiber decreased,and the offset distance of the repeated path increased.When the receiving distance was 7 mm,the offset distance reached 1.1 mm.As the voltage increased,the offset distance of the fiber on the repeating path increased.When the voltage was 30 kV,the offset distance was 0.6 mm.In addition,as the set distance of the parallel fibers increased,the deposition error of the fiber decreased rapidly at first,and then the descending speed was greatly reduced,and eventually stabilized.