Cyclic and multicyclic poly(ether sulfone)s by polycondensation of 5,5′,6,6′‐tetrahydroxy‐ 3,3,3′,3′‐tetramethyl spirobisindane and 4,4′‐difluorodiphenylsulfone |
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| Authors: | Hans R Kricheldorf Kirstin Bornhorst |
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| Institution: | 1. Institut für Technische und Makromolekulare Chemie der Universit?t Hamburg, Bundesstr. 45, D‐20146 Hamburg, GermanyInstitut für Technische und Makromolekulare Chemie der Universit?t Hamburg, Bundesstr. 45, D‐20146 Hamburg, Germany;2. Institut für Technische und Makromolekulare Chemie der Universit?t Hamburg, Bundesstr. 45, D‐20146 Hamburg, Germany |
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| Abstract: | 5.5′,6,6′‐Tetrahydroxy‐3,3,3′,3′‐tetramethyl spirobisindane (TTSBI) was polycondensed with 4,4′‐difluorodiphenylsulfone (DFDPS) in DMSO with K2CO3 as catalyst and azeotopic removal of water. The feed ratio of DFDPS/TTSBI was varied from 1.0/1.0 to 2.0/1.0 at concentrations avoiding gelation. At feed ratios around 1.0/1.0 hyperbranched polymers were a minority and cyclic poly(ether sulfone)s were the predominant reaction products. With increasing feed ratio of DFDPS more and more multicyclic polymers were formed, and at a feed ratio of 1.9/1.0 perfect multicycles free of functional groups were the vast majority of the reaction product. Despite variation of the reaction conditions quantitative conversion was not achieved. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 5597–5605, 2007 |
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| Keywords: | cyclization multicycles poly(ether sulfone)s tetrahydroxytetramethyl spirobisindane polycondensation |
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