Nanoporous polyimide film from poly(ethylene glycol-co-imide) using a one-step heat calcination process |
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Authors: | Young-Woon Cho Kyung-Seok Kang Chanhyuk Jee Ji-Hyun Kim Dongju Jang |
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Institution: | Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, South Korea |
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Abstract: | Polyamic acid (PAA) made from 3,3, 4,4-biphenyltetracarboxylic dianhydride and 4,4-diaminodiphenyl ether was synthesized and used as the backbone of nanoporous polyimide. Thermally labile polyethylene glycol (PEG) at 10, 20 or 30 wt% was introduced to the end group of PAA. Self-assembled PAA-b-PEG micelle-like nanoparticles could be formed as a result of amphiphilic characteristics of hydrophobic PAA and hydrophilic PEG. Thermal imidization and degradation of spin-coated amphiphilic PAA-b-PEG film were performed sequentially through one-step heat treatment to obtain polyimide film with nanopores. Pore sizes decreased with increasing amount of PEG block and their dielectric constants decreased from 2.71 ± 0.13 to 2.38 ± 0.11. |
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Keywords: | Nanoporous polyimide poly(ethylene glycol-co-imide) dielectric constant tensile strength one-step calcination |
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