| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 99 === In this study, a series of polyimide/poly(vinyl alcohol) (SPI/PVAs) polymer blend and semi-interpenetrating networks of sulfonated polyimide/poly(vinyl alcohol) polymer (SIPN SPI/cPVA20-GAs) proton exchange membranes were successfully synthesis. The linear polymer composes of sulfonated polyimide (SPI) derived from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), sulfonated 4,4''-Bis(4-aminophenoxy)biphenyl (BDSA) and 4,4’-oxydianiline (ODA) were prepared by a thermal imidization reaction. SPI was blended with 5 phr, 10 phr and 20 phr PVA respectively to obtain SPI/PVAs polymer blend membranes. The networks structure of PVA was prepared by immersing SPI/PVA20 membrane in pH~1.4, 1vol% glutaraldehyde (GA) solution at 30℃. By controlling crosslinking time, different crosslinking degree of SIPN SPI/cPVA20-GAs membranes can be obtained. Fourier transform infrared spectroscopy (FTIR-ATR) were utilized to verify the synchronization of the imidization of sulfonated poly(amic acid) (SPAA) and the crosslinking reactions between PVA and GA. The structure-property relationship of proton exchange membranes are discussed in details according to the chemical structure of the various content and crosslinking degree of PVA in the SPI/PVAs polymer blend and SIPN SPI/cPVA20-GAs proton exchange membranes from the viewpoints of thermal stability, water uptake, dimension stability, proton conductivity, oxidation stability, methanol permeability, and direct methanol fuel cell (DMFC) performance.
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