Shape-Memory Polymeric Artificial Muscles: Mechanisms, Applications and Challenges.

Area of Science:

• Materials Science
• Robotics
• Polymer Science

Background:

• Shape-memory materials exhibit a unique ability to return to their original shape after deformation when subjected to a stimulus.
• Shape-memory artificial muscles, a subclass of artificial muscles, are fabricated using shape-memory polymers (SMPs) or liquid crystal elastomers (LCEs).
• SMP artificial muscles enable complex shapes and biomimetic designs without intricate linkage systems, finding use in soft robotics and actuators.

Purpose of the Study:

• To review recent advancements in the fabrication, modeling, and manipulation of SMP-based artificial muscles.
• To focus on the mechanisms, applications, and actuation challenges of SMP artificial muscles.
• To specifically examine thermally, photo-, and electrically actuated SMP artificial muscles.

Main Methods:

• Review of recent literature on shape-memory polymer (SMP) artificial muscles.
• Analysis of fabrication techniques including twist insertion and shape fixation via T_m or T_g.
• Examination of actuation mechanisms for thermal, photo, and electrical stimuli.

Main Results:

• Significant progress has been achieved in the fabrication, modeling, and manipulation of SMP artificial muscles.
• SMP artificial muscles demonstrate broad applicability in areas such as biomimetics, soft robotics, and actuators.
• Focus on thermal, photo, and electrical actuation mechanisms provides insight into their operational capabilities.

Conclusions:

• SMP artificial muscles represent a promising technology for advanced actuation systems.
• Further research into overcoming actuation challenges will enhance their performance and expand applications.
• The review underscores the potential of SMPs in developing sophisticated artificial muscle technologies.