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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Fabrication Process of Silicone-based Dielectric Elastomer Actuators
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Poly(ethylene glycol) Diacrylate Based Electro-Active Ionic Elastomer.

Chathuranga Prageeth Hemantha Rajapaksha1, Chenrun Feng2, Camilo Piedrahita3

  • 1Department of Physics, Kent State University, Kent, OH, 44240, USA.

Macromolecular Rapid Communications
|February 6, 2020
PubMed
Summary
This summary is machine-generated.

This study reports novel electro-active actuators using modified poly(ethylene glycol) diacrylate. These actuators demonstrate durable and fast bending under low voltage, showing great potential for soft robotics.

Keywords:
actuatorselectro-activeionic liquidspoly(ethylene glycol) diacrylatesoft robotics

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Robotics

Background:

  • Ionic electro-active polymers (iEAPs) are crucial for soft robotics, but often require high voltages for actuation.
  • Developing iEAPs with enhanced performance, such as high strain and durability at low voltages, remains a key challenge.

Purpose of the Study:

  • To prepare and characterize a novel electro-active actuator based on modified poly(ethylene glycol) diacrylate (PEGDA).
  • To investigate the low-voltage induced bending (converse flexoelectricity) of the developed material.
  • To evaluate the actuator's performance in terms of durability, switching time, and bending angle for soft robotic applications.

Main Methods:

  • Crosslinked poly(ethylene glycol) diacrylate (PEGDA) was modified with thiosiloxane (TS) and an ionic liquid (1-hexyl-3-methylimidazolium hexafluorophosphate, IL).
  • The material's actuation was tested under low DC voltages (1 V and 8 V) using PEDOT:PSS and gold electrodes.
  • Performance metrics including strain, durability (cycle retention), switching time, and bending angle were measured.

Main Results:

  • The TS/PEGDA/IL based actuator exhibited durable (95% retention over 5000 cycles) and fast (2 s switching time) actuation at 1 V with PEDOT:PSS electrodes.
  • Under 8 V with gold electrodes, the film achieved a significant 270° bending angle and 6% strain, an unprecedented value for iEAPs.
  • The material demonstrated converse flexoelectricity, enabling low voltage-induced bending.

Conclusions:

  • The developed TS/PEGDA/IL material is a promising candidate for high-performance electro-active actuators in soft robotics.
  • The study highlights the potential of modifying PEGDA with TS and IL to achieve significant actuation at low voltages.
  • The achieved strain and bending angle at low voltages represent a significant advancement in iEAP technology for practical applications.