Open AccessFabrication and Properties of Polyimide/Aluminum Oxide Composite Films via Different Alkali Etching and Ion Exchange Technique
Author(s) -
Mingyu Zhang,
Lizhu Liu,
Chunqi Zhang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/782/2/022096
Subject(s) - polyimide , materials science , thermogravimetric analysis , composite number , surface modification , scanning electron microscope , ion exchange , aqueous solution , alkali metal , composite material , fourier transform infrared spectroscopy , microstructure , chemical engineering , polymer chemistry , ion , chemistry , organic chemistry , layer (electronics) , engineering
The polyimide (PI)/aluminum oxide (Al 2 O 3 ) composite films were prepared via alkali surface modification and ion exchange technique on flexible PI films. Firstly, the polyamide acid layers were formed on both surfaces of PI film through chemical surface modification in aqueous KOH and NaOH solution, respectively. Subsequently the ion exchange process was processed in AlCl 3 aqueous solution. After final thermal annealing in air, the aluminum ions which exchanged on both surfaces of PI film became continuous Al 2 O 3 composite layers. The surface morphology, microstructures, thermal and electrical properties of the PI/Al 2 O 3 composite films were tested by the scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), electric breakdown voltage and corona-resistant measurement. Results from SEM measuring revealed that the surfaces of composite films became much rougher with the increasing alkali treatment time. FT-IR spectrums showed that the treatments of alkali surface modification and ion exchange had no effect on molecular structure of polyimide. TGA results showed that the excellent thermal properties of the film are maintained. Electric breakdown voltage of composite films showed monotonically decreased with the increasing alkali treatment time. Corona-resistant test results showed that the best corona-resistant times of composite films which using NaOH and KOH modification were up to 22.6 minutes and 15.4 minutes, respectively.