聚L-乳酸/菜籽蛋白共混纳米纤维毡的制备与表征

以聚L-乳酸、菜籽蛋白为原料,高压静电纺丝制备聚L-乳酸(PLLA)/菜籽蛋白共混复合纳米纤维毡,考察了不同电压、极距和三氟乙酸添加量对纳米纤维形态及直径的影响,采用傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)和X-射线衍射(XRD)对相关产物进行结构表征。结果表明:复合纤维中PLLA与菜籽蛋白之间以氢键结合,PLLA的结晶性能降低;PLLA纺丝溶液中,菜籽蛋白的三氟乙酸溶液的适量引入可显著提高纺丝速率。在PLLA质量浓度为24%的氯仿溶液中,6.5%菜籽蛋白的三氟乙酸溶液加入量为0.25 mL,电压16 kV,极距10 cm的条件下,可快速制备平均直径622 nm的PLLA/菜籽蛋白复合纳米纤维毡,纺丝速率达到5.2 mg/min。

Preparation and Characterization of Poly(L-lactic acid)/Rapeseed Protein Blend Nanofiber

The rapeseed protein/PLLA composite nanofiber felt was prepared via electrospinning.The effects of voltages,tip to collector distance and trifluoroacetic acid on the morphology and structure of the nanofibers were investigated by scanning electron microscopy（SEM）,Fourier transform infrared（FT-IR）,X-ray diffraction（XRD）.Results indicated that there were hydrogen bonds between rapeseed protein and PLLA in the composite fibers,and the crystal structure of PLLA was destroyed seriously.The addition of rapeseed protein/trifluoroacetic acid solution results in a higher spinning speed,and the finer fibers would be also obtained.The rapeseed protein/PLLA composite fiber felt（about 5.2 mg/min） with average diameter of 622 nm could be prepared quickly at the following optimal process parameters： the concentration of PLLA was 24 %（contained 1 g PLLA）,the volume of rapeseed protein/trifluoroacetic acid solution was 0.25 mL,the applied voltage was 16 kV,and the tip-to-collector distance was 10 cm.