The Synthesis of Anionic and Amine Containing Polymers for Potential Gas Separations
type: CreativeWork
description: With the growth of industry, the need for gas separation has increased. In the last few decades, various types of polymeric gas separation membranes have been developed due to their advantages of energy-efficiency, easy operation processes, and low cost on assembly and maintenance. While it is crucial to develop high performance membranes that have high permeability and selectivity, it is also necessary for membranes to have good mechanical strength and thermal stability to withstand applications at various operation pressures. The objective of this research is to develop new synthetic routes to polymers for potential uses in gas separation applications. Initial efforts focused on the synthesis of sulfonyl polyimide ionomers (SPI). A novel SPI with tertiary amine cations (SPI[DIPEA]) was synthesized via a condensation polymerization. With the anionic charges on the pendant groups of SPI, ionic liquids can be combined with SPI polymers by simple cation exchanges. In this study, four different imidazolium species (i.e., 1-n-butyl-3-methylimidazolium chloride, 1-butyl-2,3-dimethylimidazolium bromide, 1,3-dibutylimidazolium bromide, and 1-butyl-2,3,4,5-tetramethyl imidazolium bromide) were successfully embedded in SPI forming SPI[C4mim], SPI[C4dmim], SPI[C4bim], and SPI[C4m4im]. SPI[DIPEA] and SPI[C4mim] showed higher CO2 solubility than other gases (H2, N2, CH4) and this resulted in better CO2/ N2 and CO2/ CH4 ideal selectivities in comparison with SPI[Na]. Cationic imidazolium polymers (e.g., [PMDA-API-pXy][Tf2N] and [6FDA-API-pXy][Tf2N]) were also combined SPI[DIPEA] and SPI[C4mim] yielding binary polymer mixtures (i.e. SPI/[PMDA-API-pXy][Tf2N], SPI[C4mim]/ [PMDA-API-pXy][Tf2N], and SPI[C4mim]/ [6FDA-API-pXy][Tf2N]). However, attempts at preparing solution-casted membranes from these binary polymer mixtures failed due their poor processability. Next, the synthesis and characterization of anionic sulfonated polyimide and polyamide ionenes with negative charges on the …
abstract: With the growth of industry, the need for gas separation has increased. In the last few decades, various types of polymeric gas separation membranes have been developed due to their advantages of energy-efficiency, easy operation processes, and low cost on assembly and maintenance. While it is crucial to develop high performance membranes that have high permeability and selectivity, it is also necessary for membranes to have good mechanical strength and thermal stability to withstand applications at various operation pressures. The objective of this research is to develop new synthetic routes to polymers for potential uses in gas separation applications. Initial efforts focused on the synthesis of sulfonyl polyimide ionomers (SPI). A novel SPI with tertiary amine cations (SPI[DIPEA]) was synthesized via a condensation polymerization. With the anionic charges on the pendant groups of SPI, ionic liquids can be combined with SPI polymers by simple cation exchanges. In this study, four different imidazolium species (i.e., 1-n-butyl-3-methylimidazolium chloride, 1-butyl-2,3-dimethylimidazolium bromide, 1,3-dibutylimidazolium bromide, and 1-butyl-2,3,4,5-tetramethyl imidazolium bromide) were successfully embedded in SPI forming SPI[C4mim], SPI[C4dmim], SPI[C4bim], and SPI[C4m4im]. SPI[DIPEA] and SPI[C4mim] showed higher CO2 solubility than other gases (H2, N2, CH4) and this resulted in better CO2/ N2 and CO2/ CH4 ideal selectivities in comparison with SPI[Na]. Cationic imidazolium polymers (e.g., [PMDA-API-pXy][Tf2N] and [6FDA-API-pXy][Tf2N]) were also combined SPI[DIPEA] and SPI[C4mim] yielding binary polymer mixtures (i.e. SPI/[PMDA-API-pXy][Tf2N], SPI[C4mim]/ [PMDA-API-pXy][Tf2N], and SPI[C4mim]/ [6FDA-API-pXy][Tf2N]). However, attempts at preparing solution-casted membranes from these binary polymer mixtures failed due their poor processability. Next, the synthesis and characterization of anionic sulfonated polyimide and polyamide ionenes with negative charges on the …
author: Chang, Jen-Yu
language: en_US
language: English
keywords: Polymer
date published: 2022
date modified: 2026-07-27T18:44:01Z
provider: University of Alabama
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Alabama Libraries