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Updated: Jul 17, 2026

A Droplet-Based Microfluidic Approach and Microsphere-PCR Amplification for Single-Stranded DNA Amplicons
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Donor-acceptor Stenhouse adduct functionalised polymer microspheres.

Justus P Wesseler1, Grant M Cameron1, Peter A G Cormack1

  • 1WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde Thomas Graham Building 295 Cathedral Street Glasgow G1 1XL Scotland UK peter.cormack@strath.ac.uk.

Polymer Chemistry
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Light-responsive polymer microspheres functionalized with donor-acceptor Stenhouse adducts (DASAs) exhibit reversible property changes upon visible light irradiation. This innovation enables new applications in separation science and catalysis.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Donor-acceptor Stenhouse adducts (DASAs) are light-responsive molecules enabling reversible property changes in materials.
  • Current DASA applications often involve dopants or pendent groups on linear polymers.
  • Covalent incorporation of DASAs into crosslinked polymer networks remains underexplored.

Purpose of the Study:

  • To synthesize and characterize DASA-functionalized crosslinked polymer microspheres.
  • To investigate the light-induced property changes of these novel DASA-polymer materials.
  • To explore potential applications in areas like microflow assays and separation science.

Main Methods:

  • Precipitation polymerization to create poly(divinylbenzene-co-4-vinylbenzyl chloride-co-styrene) microspheres.
  • Post-polymerization chemical modification to introduce trifluoromethyl-pyrazolone DASAs.
  • Solid-state Nuclear Magnetic Resonance (ssNMR) for DASA content verification and UV-Vis spectroscopy for switching dynamics.

Main Results:

  • Successful synthesis of DASA-functionalized polymer microspheres with varying DASA content.
  • Demonstrated reversible photoisomerization of incorporated DASAs upon visible light irradiation.
  • Observed significant changes in microsphere properties, including enhanced swelling, improved water dispersibility, and increased particle size.

Conclusions:

  • DASA-functionalized crosslinked polymer microspheres represent a promising new class of light-responsive materials.
  • These materials offer expanded application potential in polymer-supported reactions, separation science, and microfluidics.
  • This work lays the foundation for developing advanced light-responsive polymer supports for solid-phase extraction and catalysis.