Polyimide (PI) nanowebs were prepared by imidization of their precursors, polyamic acid (PAA) nanowebs, fabricated by electrospinning with various process variables, and then subjected to an additional hot drawing process. Their random and uniaxial morphologies of PAA and PI nanowebs could be formed by controlling the collecting roller speed of electrospinning apparatus. The SEM image of the PI nanoweb showed that high collecting-roller speed and hot drawing effectively aligned the nanofibers in the PI nanowebs. Wide-angle X-ray diffraction (WAXD) analysis was performed to investigate the crystalline orientation of PI in the nanowebs and confirmed that annealing highly-aligned PI nanowebs imparted enhanced crystallinity of PI nanowebs. We were able to increase the tensile strength of the PI nanoweb from 28.6 MPa to 58.4 MPa by raising the collecting roller speed from 250 rpm to 1500 rpm and increased to a maximum of 83.2 MPa through an additional hot drawing at 400 °C for 30 min.

聚酰亚胺 (PI) 纳米纤维网是通过其前体聚酰胺酸 (PAA) 纳米纤维网的酰亚胺化制备的，该纳米纤维网通过使用各种工艺变量进行静电纺丝制造，然后进行额外的热拉伸工艺。通过控制静电纺丝设备的收集辊速度，可以形成它们的随机和单轴形态的 PAA 和 PI 纳米网。PI 纳米纤维网的 SEM 图像表明，高收集辊速度和热拉伸有效地使 PI 纳米纤维网中的纳米纤维对齐。进行广角 X 射线衍射 (WAXD) 分析以研究纳米纤维网中 PI 的结晶取向，并证实对高度排列的 PI 纳米纤维网进行退火提高了 PI 纳米纤维网的结晶度。我们能够将 PI 纳米纤维网的拉伸强度从 28.6 MPa 增加到 58。