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Detachable, Self-Repairing, and Closed-Loop Recyclable Self-Initiated Light-Curing Adhesives with Controllable
Zhao Liu1,2, Xiaoming Ren1, Hua Zheng1
1Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China.
ACS Applied Materials & Interfaces
|December 10, 2025
Summary
This study introduces a novel light-curing adhesive (LCA) derived from natural lipoic acid and polycaprolactone diol. The green adhesive offers detachability, self-healing, and recyclable properties for advanced electronic packaging applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Adhesives Technology
Background:
- Conventional light-curing adhesives (LCAs) lack detachability, self-healing, and recyclability.
- Challenges exist in adjusting bonding strength and achieving closed-loop recycling for LCAs.
- Need for advanced adhesives in electronic packaging with enhanced functionalities.
Purpose of the Study:
- Develop a novel, eco-friendly, light-curing adhesive with enhanced properties.
- Incorporate detachability, self-healing, and recyclability into LCAs.
- Achieve controllable bonding strength for versatile electronic packaging solutions.
Main Methods:
- Synthesized a self-photosensitive prepolymer via esterification of lipoic acid (TA) and polycaprolactone diol (PCL).
- Investigated light-curing kinetics, demonstrating rapid polymerization without photoinitiators.
- Evaluated detachability, self-healing capabilities (UV/heat stimuli), and closed-loop recycling performance.
- Assessed bonding strength influenced by PCL crystallization behavior.
Main Results:
- Achieved complete light-curing within 2 minutes without additional photoinitiators.
- Demonstrated facile detachability (120 °C, 16 s) and dual-stimuli-responsive self-repairing properties (UV/heat).
- Exhibited efficient closed-loop recycling and controllable bonding strength, reaching a maximum adhesion of 5.1 MPa.
- The disulfide bond in TA-PCL prepolymer enabled these advanced functionalities.
Conclusions:
- A versatile, green light-curing adhesive was successfully developed.
- The novel LCA offers detachability, self-healing, and recyclability for electronic packaging.
- This strategy provides a new pathway for designing high-value adhesives with tunable properties.
