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Related Concept Videos

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Related Experiment Video

Updated: Aug 29, 2025

Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene
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Classifying deep eutectic solvents for polymer solvation via intramolecular dimer formation.

Shreya Juneja1, Siddharth Pandey1

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Deep eutectic solvents (DESs) like ChCl:Gly and ChCl:urea act as

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Physical Chemistry

Background:

  • Deep eutectic solvents (DESs) are tunable, low-cost solvents with diverse physicochemical properties.
  • Understanding solvent behavior is crucial for polymer dissolution and processing.
  • Polydimethylsiloxane (PDMS) is a widely used silicone polymer.

Purpose of the Study:

  • To evaluate two specific DESs, choline chloride:glycerol (ChCl:Gly) and choline chloride:urea (ChCl:urea), as solvents for PDMS.
  • To investigate the solvation behavior of PDMS in these DESs compared to liquid PDMS and glycerol.
  • To characterize the polymer conformation and solvent interactions using fluorescence spectroscopy.

Main Methods:

  • Utilized pyrene (Py) end-tagged PDMS (Py-PDMS-Py) as a fluorescent probe to study intramolecular dimerization.
  • Investigated fluorescence excitation spectra and excited-state intensity decay kinetics.
  • Examined solvent effects across a temperature range (293.15–363.15 K).

Main Results:

  • Ground-state interactions between pyrenyl moieties were observed in ChCl:Gly, ChCl:urea, and glycerol.
  • PDMS was found to adopt a predominantly coiled conformation in DESs and glycerol.
  • Liquid PDMS (PDMS2000) promoted PDMS-PDMS contact, maximizing polymer chain extension.

Conclusions:

  • DESs (ChCl:Gly, ChCl:urea) and glycerol act as 'bad' solvents for PDMS, favoring coiled polymer chains.
  • Liquid PDMS (PDMS2000) functions as a 'good' solvent, promoting polymer chain extension.
  • The findings provide insights into polymer-solvent interactions in DESs.