Two‐Way Shape Memory Polymer Composite Gripper for Adaptive Robotic Applications

Aamna Hameed, Kamran Ahmed Khan · Wiley · 2025

A cross-linked PCL/DCP two-way shape-memory polymer composite embedded in a low-stiffness elastomer matrix enables temperature-driven, repeatable gripper opening/closing without external actuation programming.

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Plain English summary

The study focuses on shape memory polymers (SMPs) for robotic actuation, emphasizing that two-way SMPs can change shape and recover without additional programming, unlike one-way SMPs. A specific two-way SMP composite is created using a cross-linked polycaprolactone/dicumyl peroxide (PCL/DCP) system. The material’s thermomechanical and thermal behavior is measured with DMA and DSC. To make a freestanding device that changes shape using temperature alone (without external loads for actuation), the SMP is embedded in a low-stiffness elastomeric matrix. The composite shows an intrinsic two-way shape memory effect with high shape fixity and strain recovery (96% and 96.8%). Finally, the material is tested as a gripper, demonstrating repeatable opening and closing during heating and cooling cycles and durability over multiple actuation cycles.

Why this matters

The abstract claims development of an intrinsic two-way shape memory polymer composite gripper approach using a cross-linked PCL/DCP 2W-SMP embedded in a low-stiffness elastomeric matrix to achieve temperature-only, freestanding actuation without external programming. The abstract demonstrates a gripper device with repeatable thermal actuation, but provides no evidence of commercialization, market readiness, or scaling/production details.

Key findings

  • A cross-linked PCL/DCP two-way SMP composite is developed.
  • Embedding the SMP in a low-stiffness elastomeric matrix enables freestanding temperature-driven shape change and recovery without external loads for actuation.
  • DMA/DSC characterization supports intrinsic two-way shape memory behavior during heating/cooling cycles.
  • One-way shape memory performance shows shape fixity of 96% and strain recovery of 96.8%.
  • A gripper device made from the composite exhibits repeatable opening/closing responses over multiple thermal actuation cycles.

Limitations

The abstract does not specify quantitative gripper force, payload capacity, operating temperature range, cycle life limits, or comparisons against alternative actuation technologies; it also does not state long-term durability beyond “multiple” cycles.

Publication

Publisher
Wiley
Publication date
October 30, 2025
Research type
Paper
License
http://creativecommons.org/licenses/by-nc-nd/4.0/

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