玉米醇溶蛋白/聚乳酸纳米纤维膜制备及其力学性能

Preparation and Mechanical Properties of Zein/Polylactic Acid Nanofiber Membrane

采用静电纺丝方法分别制备了无序和有序排列的玉米醇溶蛋白/聚乳酸共混纳米纤维膜,研究它们的形貌、单轴拉伸性能和双轴拉伸性能。结果表明:聚乳酸的加入增加了玉米醇溶蛋白的可纺性。对于无序排列纳米纤维膜,随着聚乳酸含量增加,纤维直径变粗,纤维膜断裂应力和伸长率都有了很大的提高。对于有序排列的纳米纤维膜,随着滚筒转速的提高,纤维直径变细,纤维沿滚筒转速方向有序排列越规整;环向的纤维膜断裂应力随转速提高而增大,而断裂伸长率减小,轴向的断裂应力随转速提高而减小,断裂伸长率增大。与无序排列纤维膜的等速双轴循环拉伸相比,有序排列纤维膜的环向拉伸强力明显比轴向的大,随着循环次数增多,回复滞后圈越小;且经多次等速双轴循环加载后,无序纤维膜的断裂强力较循环加载前大;有序排列的纤维膜环向的断裂强力较循环加载前小。

This study prepares zein/polylactic acid blending nanofiber membranes with random and ordered arrangement respectively with electro-spinning method and studies their morphology,single-shaft tensile property and biaxial tensile property.The result shows that the addition of polylactic acid increases the spinning property of zein.For nanofiber membrane with random arrangement,fiber diameter increases and breaking stress and elongation of fiber membrane increase greatly with the increase of polylactic acid content.For nanofiber membrane with ordered arrangement,fiber diameter decreases,fibers arrange orderly along the direction of rotation of the roller,toroidal breaking stress of fiber membrane increases and elongation at break decreases,axial breaking stress decreases and elongation at break increases with the increase of rotational speed of roller.Compared to constant-speed biaxial circular stretching of fiber membrane with random arrangement,toroidal tensile strength of fiber membrane with ordered arrangement is obviously higher than axial tensile strength.Recovery hysteresis loop becomes smaller with the increase of number of cycles.After constant-speed biaxial cyclic loading for multiple times,the breaking strength of fiber membrane with random arrangement increases and toroidal breaking strength of fiber membrane with ordered arrangement decreases.