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Related Concept Videos

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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Related Experiment Video

Updated: Nov 3, 2025

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
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Recyclable Shape-Memory Waterborne Polyurethane Films Based on Perylene Bisimide Modified Polycaprolactone Diol.

Kang Wei1, Haitao Zhang1,2, Jianbo Qu1

  • 1School of Light Industry Science and Engineering, Shandong Academy of Sciences, Qilu University of Technology, Jinan 250353, China.

Polymers
|June 2, 2021
PubMed
Summary

This study developed recyclable, shape-memory waterborne polyurethanes (WPUs) using perylene bisimide (PBI) chain extenders. The resulting PBI-WPU demonstrated superior thermal and mechanical properties, enabling effective recycling for sustainable applications.

Keywords:
perylene bisimidepolycaprolactone diolrecyclableshape-memorywaterborne polyurethane

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Growing demand for functional and recyclable waterborne polyurethanes (WPUs).
  • Need for advanced materials with enhanced thermal, mechanical, and shape-memory properties.
  • Exploration of novel soft segment structures to improve WPU performance.

Purpose of the Study:

  • To synthesize and characterize novel WPUs using perylene bisimide (PBI) and ε-caprolactone.
  • To investigate the influence of soft segment structure on WPU properties, including recyclability and shape memory.
  • To evaluate the potential of the developed WPUs for sustainable coating and paint applications.

Main Methods:

  • Grafting ε-caprolactone onto PBI and 1,4-butanediol (BDO) to form PBI-PCL and BDO-PCL.
  • Fabrication of PBI-WPU (PWPU) and BDO-WPU (BWPU) using PBI-PCL/polytetrahydrofuran ether glycol (PTMG) and BDO-PCL/PTMG as soft segments.
  • Characterization of WPU emulsions (particle size, zeta potential, TEM) and films (AFM, DMA, TGA, mechanical testing, recyclability assessment).

Main Results:

  • PWPU emulsions exhibited uniform particle size and good storage stability.
  • PWPU films showed enhanced microphase separation, higher glass transition temperature (Tg), superior thermal stability, and excellent mechanical properties (tensile strength 58.25 MPa, elongation at break 1241.36%).
  • PWPU films demonstrated effective recyclability, maintaining properties after three cycles, and good shape-memory performance.

Conclusions:

  • The soft segment structure significantly impacts WPU performance, with PBI-based WPUs outperforming BDO-based ones.
  • Developed PWPU exhibits promising recyclability and shape-memory characteristics.
  • PWPU holds significant potential for applications in recyclable and shape-memory coatings and paints.