Kim, Eun-Ki Lee, So Young Nam, Sang Yong Yoo, Sung Jong Kim, Jin Young Jang, Jong Hyun Henkensmeier, Dirk Kim, Hyoung-Juhn Lee, Jong-Chan 2024-01-20T00:02:10Z 2024-01-20T00:02:10Z 2021-09-03 2017-12 0959-8103 https://pubs.kist.re.kr/handle/201004/122002 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. (c) 2017 Society of Chemical Industry English WILEY Synthesis of high molecular weight polybenzimidazole using a highly pure monomer under mild conditions Article 10.1002/pi.5426 1 POLYMER INTERNATIONAL, v.66, no.12, pp.1812 - 1818 POLYMER INTERNATIONAL 66 12 1812 1818 N scie scopus 000415357400014 2-s2.0-85030084605 Polymer Science Polymer Science Article; Proceedings Paper BLEND MEMBRANES PBI FIBER solvent polymerization engineering plastics isophthalaldehyde bisulfite adduct polybenzimidazole