Int. J. Mol. Sci. 2013, 14(5), 8698-8707; doi:10.3390/ijms14058698
Communication

Porous Polyimide Membranes Prepared by Wet Phase Inversion for Use in Low Dielectric Applications

Received: 30 November 2012; in revised form: 27 March 2013 / Accepted: 27 March 2013 / Published: 24 April 2013
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: A wet phase inversion process of polyamic acid (PAA) allowed fabrication of a porous membrane of polyimide (PI) with the combination of a low dielectric constant (1.7) and reasonable mechanical properties (Tensile strain: 8.04%, toughness: 3.4 MJ/m3, tensile stress: 39.17 MPa, and young modulus: 1.13 GPa), with further thermal imidization process of PAA. PAA was simply synthesized from purified pyromellitic dianhydride (PMDA) and 4,4-oxydianiline (ODA) in two different reaction solvents such as γ-butyrolactone (GBL) and N-methyl-2-pyrrolidinone (NMP), which produce Mw/PDI of 630,000/1.45 and 280,000/2.0, respectively. The porous PAA membrane was fabricated by the wet phase inversion process based on a solvent/non-solvent system via tailored composition between GBL and NMP. The porosity of PI, indicative of a low electric constant, decreased with increasing concentration of GBL, which was caused by sponge-like formation. However, due to interplay between the low electric constant (structural formation) and the mechanical properties, GBL was employed for further exploration, using toluene and acetone vs. DI-water as a coagulation media. Non-solvents influenced determination of the PAA membrane size and porosity. With this approach, insight into the interplay between dielectric properties and mechanical properties will inform a wide range of potential low-k material applications.
Keywords: low K material; porous polyimide; poly amic acid; wet phase inversion
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MDPI and ACS Style

Kim, S.; Jang, K.-S.; Choi, H.-D.; Choi, S.-H.; Kwon, S.-J.; Kim, I.-D.; Lim, J.A.; Hong, J.-M. Porous Polyimide Membranes Prepared by Wet Phase Inversion for Use in Low Dielectric Applications. Int. J. Mol. Sci. 2013, 14, 8698-8707.

AMA Style

Kim S, Jang K-S, Choi H-D, Choi S-H, Kwon S-J, Kim I-D, Lim JA, Hong J-M. Porous Polyimide Membranes Prepared by Wet Phase Inversion for Use in Low Dielectric Applications. International Journal of Molecular Sciences. 2013; 14(5):8698-8707.

Chicago/Turabian Style

Kim, Soohyun; Jang, Keon-Soo; Choi, Hee-Dok; Choi, Seung-Hoon; Kwon, Seong-Ji; Kim, Il-Doo; Lim, Jung A.; Hong, Jae-Min. 2013. "Porous Polyimide Membranes Prepared by Wet Phase Inversion for Use in Low Dielectric Applications." Int. J. Mol. Sci. 14, no. 5: 8698-8707.

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