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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...

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Polyurethane Shape Memory Polymer/pH-Responsive Hydrogel Hybrid for Bi-Function Synergistic Actuations.

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Summary
This summary is machine-generated.

This study introduces a novel hybrid actuator combining shape memory polymers and hydrogels. This new material offers repeatable programming for complex, multi-shape actuations, overcoming limitations of single-use smart materials.

Keywords:
actuationsbio-mimeticsprogrammabilityshape memory polymersstimuli-responsive hydrogels

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Area of Science:

  • Smart Materials Science
  • Polymer Science
  • Soft Robotics

Background:

  • Stimuli-responsive actuating hydrogels offer complex deformation but are limited by single-use programming.
  • Existing anisotropic hydrogels have a one-time programming capability, restricting their application range.

Purpose of the Study:

  • To develop a novel, multi-programmable hybrid actuator with complex stimuli-responsive deformation.
  • To overcome the single-actuation limitation of traditional hydrogels by combining shape memory polymers and hydrogels.

Main Methods:

  • Fabrication of a bilayer hybrid actuator using polyurethane shape memory polymer (PU SMP) and polyacrylic-acid (PAA) hydrogel.
  • Utilizing a cellulose-fiber based napkin and UV-adhesive for strong bonding between SMP and hydrogel layers.
  • Programming the bilayer hybrid sheet by shaping in hot water and fixing in cool water, enabling multi-repeatable shape changes.

Main Results:

  • The hybrid actuator demonstrated high shape-fixing ratios (up to 88.92%) and an actuation speed of 25.71 °/min.
  • The material was successfully programmed and reprogrammed at least nine times, achieving various 1D, 2D, and 3D shapes (bending, folding, spiraling).
  • Developed bio-mimetic devices like a 'paw', 'pangolin', and 'octopus' to demonstrate complex actuations.

Conclusions:

  • A novel SMP/hydrogel hybrid actuator with excellent multi-repeatable programmability was developed.
  • This hybrid material enables complex, stimuli-responsive actuations from a single device, overcoming previous limitations.
  • The work presents a new strategy for designing advanced soft intelligent materials and systems.