等离子体处理对PCL溶液静电纺丝性能的影响

Effect of plasma treatment on electrospinning performance of PCL solution

以聚己内酯(PCL)为溶质、三氯甲烷/二甲基甲酰胺混合液为溶剂,采用低温等离子体对PCL溶液进行预处理,通过静电纺丝制备PCL纳米纤维膜,研究了等离子体处理参数(外施电压、处理时间、氩气流量)对PCL溶液性质、纺丝射流、纤维形貌和结晶性能的影响。结果表明:PCL溶液的电导率和黏度随着等离子体外施电压、处理时间、氩气流量的增加而增大,有助于改善溶液的可纺性;外施电压为35 kV时,PCL纳米纤维膜的结晶结构发生改变,结晶度降低至61%;等离子体处理时间为9 min时,PCL溶液的稳定射流长度减小至8 mm,鞭动射流张角增大至69°,PCL纳米纤维膜光滑无珠粒,结晶度为67%,纤维平均直径为290 nm;氩气流量为1.5 L/min时,PCL溶液的稳定射流长度为9 mm,鞭动射流张角增大至64°,PCL纳米纤维膜的结晶度为66%,纤维平均直径为430 nm。

Polycaprolactone(PCL)solution with PCL as solute and chloroform/N-methylformamide mixture as solvent was pretreated by low-temperature plasma and was produced into PCL nanofiber membrane by electrospinning.The effects of plasma treatment parameters(applied voltage,treating time,argon flow rate)on the properties of PCL solution,spinning jet,fiber morphology and crystallization behavior were studied.The results showed that the conductivity and viscosity of PCL solution increased with the increase of plasma applied voltage,treating time and argon flow rate,which helped to improve the spinnability of the solution;the crystalline structure of PCL nanofiber membrane changed,and the crystallinity decreased to 61%when the applied voltage was 35 kV;the stable jet length of PCL solution decreased to 8 mm,the whip jet angle increased to 69°,and the PCL nanofiber membrane was smooth without beads and possessed a crystallinity of 67%and an average fiber diameter of 290 nm when the plasma treatment time was 9 min;and the stable jet length of PCL solution was 9 mm,the whip jet angle increased to 64°,the crystallinity of PCL nanofiber membrane was 66%,and the average fiber diameter was 430 nm when the argon flow rate was 1.5 L/min.