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- W3092091292 endingPage "123121" @default.
- W3092091292 startingPage "123121" @default.
- W3092091292 abstract "Tert-butoxycarbonyl (t-BOC) is a thermally labile moiety that can be used to protect hydroxyl groups on polymers. In this study, t-BOC was appended onto a polyimide consisting of 2,2′-bis-(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and 3,3′-dihydroxy-4,4′-diamino-biphenyl (HAB), after which the polymer was formed into self-standing films. Solid-state thermal treatments were performed to systematically remove t-BOC moieties to alter the physical packing structure and concomitant gas transport properties of the polymer. Despite performing deprotection reactions well below the glass transition temperature of 6FDA-HAB (~300 °C), this free volume manipulation (FVM) approach produced only subtle differences in polymer density, fractional free volume, average free volume element size, and gas transport properties relative to the unprotected polymer. While these findings suggest that thermally removing covalently bound functional groups from polymer films can be used to manipulate free volume and gas transport performance for glassy polymers, more robust polymer systems than linear polyimides are required to preserve the nascent free volume architecture generated from this approach." @default.
- W3092091292 created "2020-10-15" @default.
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- W3092091292 date "2021-01-01" @default.
- W3092091292 modified "2023-10-17" @default.
- W3092091292 title "Free volume manipulation of a 6FDA-HAB polyimide using a solid-state protection/deprotection strategy" @default.
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- W3092091292 doi "https://doi.org/10.1016/j.polymer.2020.123121" @default.
- W3092091292 hasPublicationYear "2021" @default.
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