Porous polyimide membranes prepared by wet phase inversion for use in low dielectric applications

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: 1.1...

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Bibliographic Details
Published in:International journal of molecular sciences 2013-04, Vol.14 (5), p.8698-8707
Main Authors: Kim, Soohyun, Jang, Keon-Soo, Choi, Hee-Dok, Choi, Seung-Hoon, Kwon, Seong-Ji, Kim, Il-Doo, Lim, Jung Ah, Hong, Jae-Min
Format: Article
Language:English
Subjects:
4-Butyrolactone - chemistry
Acids
Benzene Derivatives - chemistry
Communication
Dielectric properties
Electricity
Imides - chemistry
low K material
Mechanical properties
Membranes
Membranes, Artificial
Microscopy, Electron, Scanning
Molecular weight
Phthalimides - chemistry
poly amic acid
Polymerization
Polymers
Polymers - chemistry
Porosity
porous polyimide
Solvents
Spectroscopy, Fourier Transform Infrared
Tensile Strength
Viscosity
Water - chemistry
wet phase inversion
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Summary: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.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms14058698