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Title: Synthesis of imidazolium-mediated Poly(benzoxazole) Ionene and composites with ionic liquids as advanced gas separation membranes

Journal Article · · Polymer
 [1];  [1];  [2];  [1]
  1. Univ. of Alabama, Tuscaloosa, AL (United States)
  2. NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)

We report thermally rearranged (TR) polymers and ionic polymers are two material classes which have been employed in leading gas separation membranes. This work introduces a novel approach of combining the benzoxazole functionality associated with TR polymers with tailorable cationic groups, yielding a new type of imidazolium-mediated poly(benzoxazole) ionene polymer, “Im-PBO-Ionene” with the aim of enhanced CO2 separation performance. The structural changes exhibited from the Coulombic interactions between the ionene backbone and the “free” ionic liquid (IL) resulted in enhanced gas separation performance, shown in fundamental characterizations, observed through increased diffusivities and more notably, retained high selectivities and 3x or 5x respective increases in CO2 permeability upon the addition of 1 or 2 equivalents of IL per polymer repeat unit. These new high-performance ionenes demonstrate the versatility of ionene design and potential of the ionene + IL material platform for gas separation membranes with versatile incorporation of sophisticated functional and structural features.

Research Organization:
Univ. of Alabama, Tuscaloosa, AL (United States); NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); GAANN Fellowship
Grant/Contract Number:
SC0018181; 80NSSC19K1314; CHE-1726812; P200A180056
OSTI ID:
1852529
Alternate ID(s):
OSTI ID: 1776184
Journal Information:
Polymer, Vol. 214, Issue C; ISSN 0032-3861
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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