Adhesion Mechanism of Dissimilar Materials Reveals Prospects for Reducing Environmental Burden through Multi-Materials – SALT NEWS

Kyushu University announced on the 13th that it had explained for the first time in the world the mechanism by which polymer chains form at the adhesion interface. If we develop a new adhesive technology based on this knowledge, it will be possible to assemble automobiles with adhesives, which is expected to lead to lower carbon dioxide emissions by reducing weight.

In recent years, attention has been focused on multi-material technology that combines multiple dissimilar materials in the right place. For example, the combination of non-ferrous metals and carbon fiber composite materials can reduce mobility weight and contribute to the promotion of carbon neutrality through energy conservation. In order to promote the use of multi-materials, it is necessary to build a reliable bonding technology that surpasses the conventional bonding technology. However, until now, it has not been elucidated how the polymer, which is part of the adhesive, forms an interface on the adhesion and adhesion, and the essential mechanism has not been elucidated .

Research groups from Kyushu University and Shizuoka University conducted atomic force microscopy (AFM) observations and coarse-grained molecular dynamics (CGMD) simulations to elucidate the adsorption behavior of polymers on dissimilar material surfaces. For the first time, we managed to visually explain the adsorption mechanism of string-like polymer chains on the solid surface and the formation mechanism of the interfacial layer in the adsorption process of deoxyribonucleic acid (DNA) of different lengths on solid materials.

Clarifying for the first time in the world the adsorption layer formation process at the dissimilar polymer interface, which is important for design guidelines for multi-materials.

When attached to mica (mica), which is smooth at the atomic level, the chains with short polymer chains are independently adsorbed at random sites, and the chains with long chains are adjacent to each other even if there are many empty spaces around them. It was absorbed together. With shorter chains, after passing through a partially adsorbed state, it reaches a single adsorbed state, and with longer chains, the partially adsorbed chain hooks other chains, resulting in co-adsorption in which multiple molecules are adsorbed nearby It was found that there is a tendency to They also found that short chains form the adsorption layer slowly, while long chains form the adsorption layer relatively quickly. Adsorption layers containing short chains had a dense train structure (adsorbed parts in the string), and adsorption layers containing many long chains had a loop structure (floating parts not adsorbed in the string).

This research elucidates the structural characteristics of the polymer chains that exist in the adhesive joints of multi-materials, and is expected to lead to the creation of innovative adhesive technologies in the future. It also makes it possible to strengthen polymer multi-materials, which was not possible with conventional adhesive technology, and bio-derived polymers make it possible to easily return devices that have completed their role to the soil . The creation of environmentally friendly polymer multi-materials has become a reality.

Image courtesy: Kyushu University (top image is image)


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