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Polyurethanes with aggregation-enhanced emission characteristics: preparation and properties.

Kun Wang1, Jiping Yang, Chen Gong

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New polyurethanes synthesized with varying soft/hard segment ratios show tunable aggregation-enhanced emission (AEE) properties. Heat treatment significantly enhances fluorescence intensity by promoting ordered polymer structures, indicating potential for advanced fluorescent materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Electronics

Background:

  • Polyurethanes are versatile polymers with tunable properties.
  • Aggregation-enhanced emission (AEE) materials offer unique fluorescence characteristics.
  • Controlling polymer morphology is key to optimizing optical properties.

Purpose of the Study:

  • To synthesize novel polyurethanes incorporating an amino-terminated tetraaryl-buta-1,3-diene derivative (TABDAA).
  • To investigate the effect of soft/hard segment ratios on the aggregation-enhanced emission (AEE) behavior of these polyurethanes.
  • To explore the impact of thermal treatments on the fluorescence properties and structural organization of the AEE polyurethanes.

Main Methods:

  • Synthesis of polyurethanes (TMPU-211, TMPU-321, TMPU-431) with varying molar ratios of soft and hard segments.
  • Characterization of aggregation-enhanced emission (AEE) behavior in DMF/water solutions and as thin films.
  • Thermal treatment (quenching and annealing) and analysis using Differential Scanning Calorimetry (DSC) and Atomic Force Microscopy (AFM).

Main Results:

  • Polyurethanes exhibited distinct AEE behaviors influenced by soft/hard segment ratios, with higher soft segment content leading to larger particle formation and sharper fluorescence increase.
  • Thermal annealing of quenched films significantly enhanced fluorescence intensity, exceeding initial levels, due to the reappearance of soft segment melting peaks and achieved ordered arrangement.
  • Polymer structure demonstrated a significant effect on AEE properties, with heat treatment inducing structural ordering and improving fluorescence emission.

Conclusions:

  • The study successfully synthesized AEE polyurethanes with tunable properties based on soft/hard segment ratios.
  • Thermal treatment is crucial for optimizing the fluorescence emission of these AEE polyurethanes by controlling polymer morphology and ordering.
  • These findings highlight the potential of these AEE polyurethanes for applications in fluorescent probes, stimuli-responsive materials, and PLED devices.