静电纺丝法纺制聚乳酸纳米纤维无纺毡

采用静电纺丝法制备了生物降解聚乳酸(PLLA)纳米纤维无纺毡。分析了纺丝液浓度、电压、接收距离、挤出速度等因素对纤维形态的影响。结果表明:纺丝液的浓度和挤出速度对纤维直径的影响较为明显,溶液挤出速度增大,所得纤维微孔含量及尺寸也增大;适当的电压和接收距离有利于收集无液滴纤维;随着纤维直径的减小,无纺毡的孔径呈减小趋势。在PLLA质量分数为5．7％、挤出速度0．8 mL／h、接受距离 15．5 cm、电压8 kV的静电纺丝条件下,可制备纤维直径为200-400 nm的PLLA纳米纤维无纺毡。

Preparation of nonwoven mats of poly(L-lactic acid) nanofiber via electrospinning

Nonwoven mats of poly (L-lactic acid ) (PLLA) biodegradable nanofiber were prepared via electrospinning. The effects of process parameters on the fiber morphology were analyzed, such as spinning solution concentration, voltage, deposition distance, extrusion rate. The results showed that the spinning solution concentration and extrusion rate had a profound effect on fiber diameter. The higher the extrusion rate was, the greater the fiber micro-pore number and dimension were. The appropriate voltage and deposition distance were helpful to the collection of the fibers with no bead. The pore size of the nonwoven mats was tended to decrease while decreasing the fiber diameter. The PLLA nanofiber with the diameter 200-400 nm can be produced via electrospinning under the conditions of PLLA mass fraction 5.7％, extrusion rate 0.8 mL/h, deposition distance 15.5 cm and voltage 8 kV.