Solubility and diffusivity of small molecules in thermally rearranged ortho-functional polyimides for gas separations

Zachary P. Smith, David Sanders, Cláudio Ribeiro, Benny D. Freeman, Donald Paul

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


A TR polymer is a polybenzoxazole or polybenzthiazole membrane derived from the thermal rearrangement and decarboxylation of hydroxyl or thiol-containing polyimides. TR polymers have shown permeabilities and selectivities above the Robeson upper bound and a resistance to CO2 plasticization for applications in natural gas sweetening; however, the fundamental transport properties of these materials have never been studied. In this work, differences in penetrant solubility and diffusivity are investigated for several polyimides and their corresponding TR polymers. Solubility increases by a factor of approximately two, while diffusivity increases by nearly two orders of magnitude. Therefore, the high permeability of TR polymers is attributed largely to high penetrant diffusivities.

Original languageEnglish
Title of host publication240th ACS National Meeting and Exposition, Boston, MA, 22 August 2010 - 26 August 2010
PublisherACS Publications
Publication statusPublished - 2010
Externally publishedYes
EventACS National Meeting and Exposition 2010 - San Francisco, United States of America
Duration: 21 Mar 201025 Mar 2010
Conference number: 239th

Publication series

NameACS National Meeting Book of Abstracts
PublisherAmerican Chemical Society
ISSN (Print)0065-7727


ConferenceACS National Meeting and Exposition 2010
Country/TerritoryUnited States of America
CitySan Francisco

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