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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

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Published on: October 23, 2015

Epoxy-based multifunctional re-bondable polymer with self-healing, shape memory and superb bonding properties.

Peixin Niu¹, Zhiying Zhao¹, Jun Zhu²

¹College of Chemistry and Pingyuan Laboratory, Zhengzhou Key Laboratory of Elastic Sealing Materials, Zhengzhou University, Zhengzhou 450001, China.

Journal of Colloid and Interface Science

|September 5, 2024

Summary

Researchers developed a novel, reusable epoxy adhesive by designing linear links and incorporating polyurethanes. This innovative material offers enhanced toughness, self-healing, and repeatable bonding, addressing environmental concerns associated with traditional epoxy resins.

Keywords:

Epoxy adhesive High elongation Repeatable bonding Shape memory Super toughness

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Area of Science:

Materials Science
Polymer Chemistry

Background:

Thermoset epoxy resins are widely used but suffer from limited processability and reusability due to their permanent cross-linked networks, causing environmental concerns.
Conventional epoxy resins often exhibit brittleness, limiting their application range and durability.

Purpose of the Study:

To develop a novel epoxy-based adhesive with improved extensibility, toughness, and reusability.
To overcome the limitations of traditional thermoset epoxy resins by designing a unique molecular structure.

Main Methods:

Exploiting the weak reactivity of aniline to create linear links between epoxy resin and curing agent.
Incorporating flexibly branched polyurethanes to introduce crosslinking points while maintaining flexibility.
Utilizing synergistic effects of disulfide and hydrogen bonds for self-healing and repeatable bonding.

Main Results:

Achieved a linear linkage in the epoxy-polyurethane system, enhancing extensibility and toughness.
Demonstrated exceptional mechanical properties: lap shear strength of 11.9 MPa, tensile strength of 14.4 MPa, and elongation at break of 607%.
Exhibited high fracture toughness (109.6 kJ/m²) and self-healing capabilities, alongside repeatable bonding characteristics.

Conclusions:

The developed epoxy adhesive offers superior performance, including enhanced toughness and reusability, by carefully designing its molecular architecture.
The combination of linear linkages, polyurethane crosslinking, and multi-level hydrogen bonding is key to achieving excellent comprehensive properties.
This work provides a new perspective on creating sustainable and high-performance reusable epoxy adhesives for broader applications.