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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
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Hypercrosslinked Additives for Ageless Gas-Separation Membranes.

Cher Hon Lau1, Xavier Mulet2, Kristina Konstas2

  • 1CSIRO, Bag 10, Clayton South, 3169, VIC, Australia. Cherhon.Lau@csiro.au.

Angewandte Chemie (International Ed. in English)
|January 11, 2016
PubMed
Summary
This summary is machine-generated.

A new scalable additive, alpha,alpha'-dichloro-p-xylene (p-DCX), prevents physical aging in gas-separation polymers. This material enhances gas-transport selectivity and performance, overcoming limitations of previous methods.

Keywords:
Davankov polymersgas separationhypercrosslinked polymersmembranesphysical aging

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Chemical Engineering

Background:

  • Physical aging, the loss of internal pores, limits the long-term application of gas-separation polymers.
  • Porous aromatic framework (PAF-1) nanocomposites were previously shown to mitigate aging but are difficult to synthesize at scale.

Purpose of the Study:

  • To identify a scalable and effective additive to prevent physical aging in gas-separation polymers.
  • To investigate the impact of the additive on gas-transport properties and selectivity.

Main Methods:

  • Development and characterization of a nanocomposite using a novel additive, alpha,alpha omino-dichloro-p-xylene (p-DCX), with gas-separation polymers.
  • Evaluation of the additive's dispersibility and its effect on polymer microstructure.
  • Assessment of gas-transport performance and selectivity over time.

Main Results:

  • The p-DCX additive demonstrates high dispersibility in gas-separation polymers, forming an intimately mixed nanocomposite.
  • The additive effectively inhibits physical aging, maintaining internal free volume over time.
  • Gas-transport selectivity was nearly doubled, and overall performance was significantly enhanced.

Conclusions:

  • A highly dispersible and scalable p-DCX additive offers a cost-effective solution to polymer physical aging.
  • The developed nanocomposite exhibits superior gas-transport performance and selectivity.
  • This additive presents a promising strategy for advancing long-term applications of gas-separation polymers.