壳聚糖纺丝液性能对静电纺纤维形态的影响

Effect of chitosan spinning solution properties on the morphology of electrospun nanofibers

配置壳聚糖(CS)与聚乙烯醇(PVA)质量比为0∶100、10∶90、20∶80、30∶70的纺丝液,并通过静电纺丝工艺制得CS/PVA纳米纤维膜。探讨纺丝液的黏度、电导率、表面张力对CS/PVA纳米纤维膜表观形貌的影响。结果表明随着CS含量的增大,CS/PVA纺丝液黏度提高、电导率上升、表面张力下降,这使得静电纺丝过程中射流更易被拉伸,所得纤维更细;但纺丝液黏度增大到一定程度后,纤维会出现串珠状或纺锤状。因此,配制出适宜黏度的纺丝液是静电纺丝的关键。当mCS∶mPVA=30∶70时,所得CS/PVA纳米纤维膜中纤维平均直径最小,且直径CV值最低,纤维形貌最为均匀。

The mass ratios of chitosan(CS)and polyvinyl alcohol(PVA)at 0∶100,10∶90,20∶80 and 30∶70 were prepared,and CS/PVA nanofiber membranes were prepared by electrospinning.The effects of viscosity,electrical conductivity and surface tension of spinning solution on the morphology of the CS/PVA nanofiber membrane were discussed.The results showed that,with the increase of CS content,the viscosity and the electrical conductivity of the CS/PVA spinning solution increased while the surface tension decreased,which made the jet easier to stretch during electrospinning,resulting in thinner fibers.However,when the viscosity of the spinning solution increased to a certain extent,the fibers would appear like beads or spindles.Therefore,suitable viscosity of spinning solution was the key of electrospinning.When mCS∶mPVA was at 30∶70,the average diameter of fibers in CS/PVA nanofiber membrane was the smallest,the diameter CV value was the lowest,and the fiber morphology was the most uniform.