Journal
FIBERS AND POLYMERS
Volume 23, Issue 2, Pages 335-342Publisher
KOREAN FIBER SOC
DOI: 10.1007/s12221-021-3362-y
Keywords
Polyimide; Nanoweb; Electrospinning; Uniaxial orientation; Annealing
Categories
Funding
- Chungnam National University
Ask authors/readers for more resources
PI nanowebs were prepared by electrospinning with various process variables, and then subjected to hot drawing to enhance the alignment of nanofibers. Analysis confirmed that high-speed collecting rollers and hot drawing could significantly improve the tensile strength of PI nanowebs.
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 degrees C for 30 min.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available