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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Ionic liquids as plasticizers for polyelectrolyte complexes.

Bodong Zhang1, David A Hoagland, Zhaohui Su

  • 1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun, 130022, P. R. China.

The Journal of Physical Chemistry. B
|February 17, 2015
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Summary

Ionic liquids (ILs) effectively plasticize polyelectrolyte complexes (PECs) by being absorbed into them. This study demonstrates ILs are superior plasticizers compared to traditional salts, enhancing PEC properties.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Physical Chemistry

Background:

  • Polyelectrolyte complexes (PECs) are water-insoluble materials formed by oppositely charged polymers.
  • Salt uptake by PECs can induce plasticization, altering their mechanical properties.
  • Ionic liquids (ILs) are salts that are liquid at low temperatures and have unique properties.

Purpose of the Study:

  • To investigate the effectiveness of ionic liquids (ILs) as plasticizers for polyelectrolyte complexes (PECs).
  • To compare the plasticization efficiency of ILs with conventional organic salts.
  • To elucidate the mechanism of IL uptake and its impact on PEC mechanical behavior.

Main Methods:

  • Preparation of PECs using polystyrene sulfonate (PSS) and poly(diallyldimethylammonium chloride) (PDDA).
  • Immersion of PECs in aqueous solutions of 1-butyl-3-methylimidazolium chloride ([BMIM][Cl]) to induce IL uptake.
  • Monitoring IL cation uptake using solution 1H NMR.
  • Assessing mechanical changes via dynamic mechanical analysis (DMA).
  • Quantifying binding interactions using isothermal titration calorimetry (ITC).

Main Results:

  • ILs were found to be more effective plasticizers for PECs than NaCl.
  • IL uptake into PECs was controllable by solution concentration, leading to increased plasticization.
  • DMA analysis showed significant changes in the glass-to-rubbery transition of plasticized PECs.
  • ITC revealed stronger binding affinity between PSS and the [BMIM](+) cation compared to Na(+).

Conclusions:

  • Ionic liquids act as superior plasticizers for polyelectrolyte complexes compared to simple organic salts.
  • The enhanced plasticization is attributed to stronger interactions between IL cations and the polyelectrolyte chains.
  • Controlled IL uptake offers a pathway to tune the mechanical properties of PECs for various applications.