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Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde

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Published on: November 11, 2022

Sintering Metal-Organic Framework Gels for Application as Structural Adhesives.

Izuru Miyazaki¹, Yumi Masuoka¹, Ayako Ohshima¹

¹Toyota Central R&D Labs., Inc., Nagakute, Aichi, 480-1192, Japan.

Small (Weinheim an Der Bergstrasse, Germany)

|March 17, 2023

Summary

Metal-organic frameworks (MOFs) show potential as structural adhesives. Sintered zeolitic imidazolate framework-67 (ZIF-67) gels join copper substrates with high shear strength, comparable to conventional adhesives.

Keywords:

mechanical properties metal-organic frameworks

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Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Metal-organic frameworks (MOFs) are versatile materials with applications in gas separation, fuel storage, catalysis, and biopharmaceuticals.
Current research on MOFs primarily focuses on their functional properties, with limited exploration of their structural applications.
The potential of MOFs as structural adhesives remains largely unexplored.

Purpose of the Study:

To investigate the feasibility of using MOFs as structural adhesives.
To evaluate the adhesive properties of zeolitic imidazolate framework-67 (ZIF-67) based materials.
To determine the optimal conditions for achieving high adhesive strength using MOFs.

Main Methods:

A sintering technique was applied to a zeolitic imidazolate framework-67 (ZIF-67) gel.
Copper (Cu) substrates were joined using the sintered ZIF-67 material.
Systematic experiments were conducted to assess the effects of temperature and pressure on adhesion.
Microstructural analysis was performed to understand the relationship between material structure and adhesive strength.

Main Results:

The sintered ZIF-67 gel successfully joined Cu substrates, achieving a shear strength exceeding 30 MPa.
This shear strength is comparable to that of conventional structural adhesives.
Vaporization of excess 2-methylimidazole and acetic acid during sintering led to a dense microstructure of large, spherical ZIF-67 crystals.
Optimal adhesion was achieved through controlled removal of volatile components, resulting in a densely aggregated crystalline structure.

Conclusions:

Zeolitic imidazolate framework-67 (ZIF-67) can function effectively as a structural adhesive.
The sintering process, coupled with controlled vaporization, is crucial for developing MOF-based adhesives with high shear strength.
MOFs represent a promising new class of materials for structural adhesive applications, expanding their utility beyond traditional functional roles.