Sulfonated poly(styrene-b-ethylene-co-butylene-b-styrene) and fullerene composites for ionic polymer actuators

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Ionic polymer-metal composite (IPMC) actuators are crucial for soft robotics and biomimetic devices.
• Pure sulfonated poly(styrene-b-ethylene-co-butylene-b-styrene) (SSEBS) based IPMCs exhibit limited electroactive performance and relaxation issues.

Purpose of the Study:

• To enhance the electro-mechanical properties of IPMC actuators.
• To investigate the effect of fullerene (C60) incorporation on IPMC actuator performance.
• To address the back relaxation phenomenon in IPMC actuators.

Main Methods:

• Development of IPMC actuators using SSEBS ionomer and fullerene-C60 composite membranes.
• Investigation of actuator bending responses under direct current (DC) and alternating current (AC) excitations.
• Scanning Electron Microscopy (SEM) analysis of Fullerene-SSEBS actuators.
• Synthesis of platinum layers on Fullerene-SSEBS actuator interfaces.

Main Results:

• Fullerene-SSEBS composite IPMCs demonstrate significantly improved tip displacement under DC excitation compared to pure SSEBS actuators.
• Actuators exhibit quick and harmonic responses under AC excitation.
• Fullerene-SSEBS based IPMC actuators show no significant back relaxation towards the cathode during prolonged DC activation.
• SEM analysis confirmed fine platinum layer synthesis on actuator interfaces.

Conclusions:

• Fullerene (C60) effectively reinforces the electro-mechanical properties of SSEBS based IPMC actuators.
• The incorporation of fullerene mitigates the back relaxation issue, leading to more stable actuator performance.
• These findings present a promising pathway for developing advanced IPMC actuators with superior functionality.