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Evaluation of the Curing of Adhesive Systems by Rheological and Thermal Testing
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Dual Dynamic Cross-Linked Epoxy Vitrimers Used for Strong, Detachable, and Reworkable Adhesives.

Xiaoyu Huang1, Chen Ding1, Yichun Wang1

  • 1School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China.

ACS Applied Materials & Interfaces
|July 10, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel reprocessable thermosetting adhesive (RTA) with rapid bonding, high strength, and self-healing. The new vitrimer adhesive, DAx-DTSAy, offers excellent recyclability and disassembly for sustainable material applications.

Keywords:
adhesivedual dynamic cross-linked bondself-healingsurface bondingvitrimer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Adhesives Technology

Background:

  • Reprocessable thermosetting adhesives (RTAs) are gaining attention for their sustainability benefits.
  • Developing RTAs with fast adhesion, high strength, and self-healing remains a challenge.

Purpose of the Study:

  • To develop a novel vitrimer adhesive (DAx-DTSAy) with enhanced reprocessability, rapid adhesion, and self-healing properties.
  • To evaluate the mechanical performance, self-healing capability, and recyclability of the new RTA.

Main Methods:

  • Synthesized a novel vitrimer, DAx-DTSAy, by adjusting rigid and flexible segments.
  • Investigated the effect of dual dynamic covalent bonds (hydroxyl ester and disulfide) on stress relaxation.
  • Assessed mechanical properties (tensile strength, lap shear strength), self-healing efficiency, and reprocessability.

Main Results:

  • DAx-DTSAy achieved a maximum tensile strength of 35.92 MPa.
  • Rapid stress relaxation was observed due to dual dynamic bonds, with a complete relaxation time 13.6 times shorter than controls.
  • High self-healing (91.8% recovery) and reprocessing capabilities (120.2% tensile strength recovery after 3 cycles) were demonstrated.
  • Lap shear strength reached 18.18 MPa on stainless steel in 15 min, with 91.9% recovery after 5 rebonding cycles.

Conclusions:

  • DAx-DTSAy exhibits excellent adhesive strength, rapid bonding, self-healing, and reprocessability, making it a high-performance RTA.
  • The synergistic effect of dual dynamic bonds and tailored segment ratios contributes to its superior properties.
  • DAx-DTSAy offers a sustainable alternative to traditional adhesives in electronics and transportation.