Effect of Alkali Treatment on the Mechanical Property of Polyimide Film

Abstract:

Polyimide films treated with an alkali and ion exchange undergo surface-confined hydrolysis to produce polyimide composites. On the other hand, it is unclear what impact this method has on the mechanical properties of PI films. This paper reports the effects of the mechanical properties of PI films exposed to an alkali (KOH) solution with different treatment time. The mechanical properties of the re-cycloimidization PI films were improved when the proper initial KOH treatment time was used. The reason might be that PI could effectively reduce the formation of the shear zone to cracks due to the increase in ductility after the proper KOH treatment and more ductile PI chains led to re-orientation at the drawing process. Therefore, the strength and elongation of the re-cycloimidization PI films were better than those of the pristine PI films. This study focused on the effects of the KOH treatment on the mechanical properties of the PI film for the first time and proposed a mechanism to explain the reason that the appropriate time of KOH treatment can enhance the mechanical properties. The results presented here can provide guidelines for preparing composite PI films via ion-exchange by the proper KOH treatment time in future studies.

• Periodical: Key Engineering Materials (Volume 744)
• Pages: 364-369
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.744.364
• Online since: July 2017
• Authors: Ming Yu Zhang*, Li Zhu Liu, K.S. Hui, K.N. Hui
• Keywords: Alkali Treatment, Mechanical Properties, Polyimide Film, Surface Modification

References

[1] Z. Wu, D. Wu, S. Qi, T. Zhang and R. Jin, Preparation of surface conductive and highly reflective silvered polyimide films by surface modification and in situ self-metallization technique, Thin Solid Films. 493 (2005) 179-184.

DOI: 10.1016/j.tsf.2005.07.286

[2] P. Mazzoldi, S. Carturan, A. Quaranta, C. Sada and V. Sglavo, Ion exchange process: History, evolution and applications. Riv. Nuovo. Cimento. 36 (2013) 397-460.

[3] K. Akamatsu, S. Ikeda, H. Nawafune and S. Deki, Surface modification-based synthesis and microstructural tuning of nanocomposite layers: monodispersed copper nanoparticles in polyimide resins, Chem. Mater. 15 (2003) 2488-2491.

DOI: 10.1021/cm034019n

[4] K. Akamatsu, K. Nakahashi, S. Ikeda and H. Nawafune, Fabrication and structural characterization of nanocomposites consisting of Ni nanoparticles dispersed in polyimide films. EPJD. 24 (2003) 377-380.

DOI: 10.1140/epjd/e2003-00116-7

[5] G. Cui, W. Liu, L. Yuan, D. Wu and Z. Wu, Transition of polyimide/α-Fe2O3 to polyimide/Fe3O4 nanocomposite films by adjusting thermal treatment surroundings of ion-doped substrates. RSC Advances. 3 (2013) 14390-14396.

DOI: 10.1039/c3ra41461b

[6] S. Ikeda, K. Akamatsu, H. Nawafune, T. Nishino and S. Deki, Formation and growth of copper nanoparticles from ion-doped precursor polyimide layers. J. Phys. Chem. B. 108 (2004) 15599-15607.

DOI: 10.1021/jp0478559

[7] S. Mu, Z. Wu, Y. Wang, S. Qi, X. Yang and D. Wu, Formation and characterization of cobalt oxide layers on polyimide films via surface modification and ion-exchange technique. Thin Solid Films. 518 (2010) 4175-4182.

DOI: 10.1016/j.tsf.2009.12.004

[8] S. X. Mu, D. Z. Wu, S. L. Qi and Z. P. Wu, Preparation of Polyimide/Zinc Oxide Nanocomposite Films via an Ion-Exchange Technique and Their Photoluminescence Properties, J. Nanomater. 10 (2011).

DOI: 10.1155/2011/950832

[9] J. Zhan, G. Tian, S. Qi, Z. Wu, D. Wu and R. Jin, Fabrication and mechanism study of CuO layers on double surfaces of polyimide substrate using surface modification, Compos. Sci. Technol. 72 (2012) 1020-1026.

DOI: 10.1016/j.compscitech.2012.03.014

[10] S. Mu, D. Wu, Y. Wang, Z. Wu, X. Yang and W. Yang, Fabrication of nickel oxide nanocomposite layer on a flexible polyimide substrate via ion exchange technique. ACS Appl. Mat. Inter. 2 (2009) 111-118.

DOI: 10.1021/am900620u

[11] G. Cui, D. Wu, S. Qi, S. Jin, Z. Wu and R. Jin, Preparation SnO2 nanolayer on flexible polyimide substrates via direct ion-exchange and in situ oxidation process, ACS Appl. Mat. Inter. 3 (2011) 789-794.

DOI: 10.1021/am1011468