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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Equation of Motion: General Plane motion01:22

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In the context of a rigid body's movement within a general plane, it is important to understand that this motion is typically triggered by external forces or couple moments exerted onto it. This principle can be explained through Newton's second law, which stipulates the translational motion of the body's center of mass along each axis.
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Programmable Polymer Actuators Perform Continuous Helical Motions Driven by Moisture.

Qing Chen1, Xiunan Yan1, Han Lu1

  • 1CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at Microscale , University of Science and Technology of China , Hefei , Anhui 230026 , China.

ACS Applied Materials & Interfaces
|May 16, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a powerful, moisture-driven polymer actuator (PPA) capable of programmable helical motions. This soft actuator, made from a unique polymer composite, offers precise control for advanced soft robotics applications.

Keywords:
helical motioninternal stressmoistureprogrammable soft actuatorsresponsive polymers

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Area of Science:

  • Materials Science
  • Polymer Science
  • Robotics

Background:

  • Soft robotics demands powerful and programmable actuators.
  • Existing actuators often lack precise control or sufficient force.

Purpose of the Study:

  • To develop a novel moisture-driven polymer actuator (PPA) with programmable actuation capabilities.
  • To investigate the generation of chirality and controlled motion in PPA via internal stress.

Main Methods:

  • Fabrication of PPA as a composite of poly(3,4-ethylenedioxythiophene)/polyvinyl alcohol/copolymer of acrylic acid and 2-acrylanmido-2-methylpropanesulfonic acid.
  • Preparation of PPA films with radial internal stress using solution-casting.
  • Cutting PPA strips at various angles to induce bending and helical motions upon moisture exposure.

Main Results:

  • PPA exhibits powerful actuation with contractile stress up to 13 MPa.
  • Programmable helical motions (left-handed and right-handed) were achieved by controlling cutting angles.
  • Modulating internal stress distribution allowed for precise control over motion direction and speed.

Conclusions:

  • The developed PPA is a powerful and programmable soft actuator.
  • The strategy of generating and utilizing internal stress in polymers offers a promising platform for smart soft actuators.
  • PPA shows potential for applications in moisture-responsive switches and transporters.