Synthesis of high molecular weight polybenzimidazole using a highly pure monomer under mild conditions

Title
Synthesis of high molecular weight polybenzimidazole using a highly pure monomer under mild conditions
Authors
김형준장종현헨켄스마이어디억유성종김진영이소영김은기남상용이종찬
Keywords
polybenzimidazole; fuel cell
Issue Date
2017-12
Publisher
Polymer international
Citation
VOL 66, NO 12-1818
Abstract
An isophthalaldehyde bisulfite adduct (IBA) was synthesized using a reaction between sodium sulfite and isophthalaldehyde. Isophthalaldehyde monosulfite adduct (IMA) was inevitably synthesized during the reaction. Because IBA and IMA have similar solubility in water, it is difficult to separate them through a recrystallization process. In order to obtain pure IBA, an excess of sodium sulfite was used. Highly pure IBA was subsequently obtained without the need for recrystallization. The IBA was then used as the starting monomer for the synthesis of poly[2,2-(m-phenylene)-5,5-bisbenzimidazole] (PBI). Previous isolation methods for IBA hindered the synthesis of high molecular weight PBI. This new synthetic procedure produces high-purity IBA, which can be used to synthesize high molecular weight PBI.
URI
http://pubs.kist.re.kr/handle/201004/67170
ISSN
0959-8103
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KIST Publication > Article
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