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采用静电纺丝的方法研制了再生丝素纳米纤维(ERSF)膜,纤维直径为50~1000nm。将脱胶后的桑蚕丝溶解在摩尔比为1:2:8的60℃CaCl2/CH3CH2OH/H2O三元体系中,将该溶液冷冻干燥后溶解在98%的甲酸中得到再生丝素溶液,对其进行静电纺丝。研究了不同纺丝条件下,静电纺再生丝素纤维的直径分布。研究发现:在一定的电压和喷丝头与接收屏的距离(C-D)下,7wt%是具有良好可纺性的临界浓度。纤维的直径随着溶液浓度的增加而增大,随着C-D的增加而减小,并且在C-D较大时可以获得较均匀的纤维。电压是另一个影响纤维直径的重要因素,当电压高于某一数值时,可以纺得细而均匀的纳米级再生丝素纤维。在9wt%,12cm C-D and 15KV的纺丝条件下,80%的纤维直径在50~150nm之间。由于所纺得的再生丝素纤维膜在水中会产生收缩,因此用甲醇和丙酮对其进行处理。力学性能是影响纤维膜实际使用的重要性能,我们测定和分析了静电纺再生丝素纤维膜处理前后的力学性能。
The regenerated silk fibroin nanofibers (ERSF) membranes were prepared by electrospinning method with fiber diameter of 50 ~ 1000nm. The degummed mulberry silk was dissolved in 60 ℃ CaCl2 / CH3CH2OH / H2O ternary system with the molar ratio of 1: 2: 8. The solution was freeze-dried and dissolved in 98% formic acid to obtain a regenerated silk fibroin solution. Electrospinning. The diameter distribution of electrospun regenerated silk fibroin was studied under different spinning conditions. The study found that at a certain voltage and spinneret distance from the receiving screen (C-D), 7 wt% is a critical concentration with good spinnability. The diameter of the fibers increases with increasing solution concentration, decreases with increasing C-D, and more uniform fibers with larger C-D. Voltage is another important factor affecting the fiber diameter, when the voltage is higher than a certain value, you can spin a fine and uniform nanoscale regenerated silk fibroin. 80% of the fiber diameter is between 50-150 nm at 9 wt%, 12 cm C-D and 15 kV spinning conditions. Since the spun regenerated silk fibroin film shrinks in water, it is treated with methanol and acetone. Mechanical properties of fiber membrane is the actual use of the important performance, we measured and analyzed the mechanical properties of electrospun regenerated silk fibroin membrane before and after treatment.