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Thin Film Composite Silicon Elastomers for Cell Culture and Skin Applications: Manufacturing and Characterization
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Flexible Waterborne Polyurethane-Bacterial Cellulose Films for Real-Time Physiological Monitoring.

Jiujiang Ji1, Changyong Chase Cao2, Ruixiang Qu3

  • 1The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China.

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Waterborne polyurethane (WPU) integrated with bacterial cellulose (BC) creates strong, flexible films. This novel composite material shows promise for durable wearable electronics and point-of-care diagnostic devices.

Keywords:
bacterial cellulose (BC)electrocardiograph (ECG)flexible electrodeswaterborne polyurethane (WPU)wearable devices

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Science

Background:

  • Bacterial cellulose (BC) is a promising biomaterial, but its inherent brittleness limits applications.
  • Enhancing BC's mechanical properties is crucial for advanced material development.

Purpose of the Study:

  • To investigate the synergistic effects of incorporating waterborne polyurethane (WPU) into bacterial cellulose (BC) fibers.
  • To develop a flexible and durable composite substrate for wearable electronic applications.

Main Methods:

  • Fabrication of WPU/BC composite films with varying WPU content.
  • Characterization of mechanical properties (tensile strength, elastic modulus, hardness).
  • Integration with flexible electrodes for testing in wearable devices.

Main Results:

  • WPU incorporation significantly enhanced tensile strength by 19.4 times compared to pure BC.
  • Hydrogen bonding between WPU and BC reduced matrix cavities, leading to plasticization and toughening.
  • WPU/BC-5 composite showed a 97.5% decrease in elastic modulus and 96.9% decrease in surface hardness.
  • The composite film reliably detected human electrocardiograph (ECG) signals when used with a flexible electrode.

Conclusions:

  • WPU/BC composite films offer a superior combination of flexibility and durability.
  • This approach provides a viable alternative for creating substrates for advanced wearable devices.
  • The material demonstrates potential for point-of-care health monitoring applications.