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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Dipicolylamine Functionalized Polyfluorene Based Gel with Lower Critical Solution Temperature: Preparation,

Chunlan Xiang1, Hao Wan1, Mingjing Zhu1

  • 1Lab of Advanced Materials & Department of Macromolecular Science, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University , Shanghai 200438, P. R. China.

ACS Applied Materials & Interfaces
|February 24, 2017
PubMed
Summary

Researchers developed a novel thermoresponsive fluorescent polymer gel using conjugated polymers and organic dyes. This material exhibits tunable phase transitions and reversible electrofluorochromic properties, offering new possibilities for smart materials.

Keywords:
LCSTelectrofluorochromismpolyfluorenerhodaminesol−gel transition

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Thermoresponsive polymer gels are crucial for smart materials.
  • Conjugated polymers offer unique optical and electronic properties.
  • Electrofluorochromic (EFC) materials enable tunable color changes via electrical stimuli.

Purpose of the Study:

  • To synthesize a novel thermoresponsive fluorescent polymer gel.
  • To investigate the mechanism of its lower critical solution temperature (LCST) phase transition.
  • To explore its electrofluorochromic properties for potential applications.

Main Methods:

  • Co-polymerization of a conjugated fluorene homopolymer (PPAOF) with organic dyes (SRB/SRB-Na).
  • Characterization using FTIR, variable-temperature 1H NMR, and cyclic voltammetry.
  • Fabrication and testing of a single-layer electrolyte-free EFC device.

Main Results:

  • Successfully prepared a thermoresponsive fluorescent polymer gel with tunable LCST.
  • Phase transition driven by electrostatic interactions between polymer and dye.
  • Exhibited dual emission bands and reversible EFC behavior with high contrast.
  • Achieved distinct fluorescence colors at different electrodes.

Conclusions:

  • The study presents a new method for designing conjugated polymer-based LCST gels.
  • The developed material demonstrates potential for advanced EFC applications.
  • Tunable phase transitions and independent color emissions open avenues for novel smart devices.