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dc.contributor.author김수현-
dc.contributor.author강건수-
dc.contributor.author최희덕-
dc.contributor.author최승훈-
dc.contributor.author권성지-
dc.contributor.author김일두-
dc.contributor.author임정아-
dc.contributor.author홍재민-
dc.date.accessioned2015-12-03T00:57:12Z-
dc.date.available2015-12-03T00:57:12Z-
dc.date.issued201305-
dc.identifier.citationVOL 14, NO 5, 8698-8707-
dc.identifier.issn14220067-
dc.identifier.other39488-
dc.identifier.urihttp://pubs.kist.re.kr/handle/201004/44766-
dc.description.abstractA 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.-
dc.publisherInternational journal of molecular sciences-
dc.subjectlow K material-
dc.subjectporous polyimide-
dc.subjectpoly amic acid-
dc.subjectwet phase inversion-
dc.titlePorous Polyimide Membranes Prepared by Wet Phase Inversion for Use in Low Dielectric Applications-
dc.typeArticle-
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