Researchers of Purdue University have unlocked the secret for developing stronger adhesives for electronics, vehicles and construction application.
 

Make Them Tougher by Making Them Weaker

“We have been using inspiration from sea creatures to develop several new adhesives,” said Jonathan Wilker, a Purdue professor of chemistry and materials engineering, who helped lead the research team. “Recently we have been seeking strategies for making adhesives tougher. One way to get there can be viewed as making the materials tougher by, first, making them weaker,” added Wilker.

The Purdue team added bonds that are broken easily throughout the material. When pressure or stress is applied to the glue, these sacrificial bonds are designed to absorb energy and break apart. Meanwhile, the rest of the larger adhesive system remains intact.

“The idea is somewhat similar to how a brick wall is made of bricks that are offset from each other,” Wilker said. “You stagger the bricks and cement so that a crack does not shoot right down through the cement lines. A crack hits the middle of a brick and the forces get spread out toward both sides, eventually decreasing to the point that the wall stays intact,” added Wilker.
 

Developing Adhesives with Application in Consumer Electronics & Construction

Wilker’s team tested this idea with several types of bonds. The ones that worked best were neither too weak nor too strong. He said that this technique for managing energy in adhesives might be a general phenomenon that could be applied to adhesives in industries ranging from consumer electronics to construction to manufacturing airplanes and automobiles. 

“We added weak bonds within the adhesive so that mechanical forces and growing cracks lose energy by breaking these bonds instead of having the whole, larger material fracture. The idea is to manage how energy moves through the material. The overall adhesive system can become tougher and less likely to break apart when placed under mechanical stress,” commented Wilker.

The team has hundreds of mussels and oysters growing in its laboratory for studying proteins used by the sea creatures attaching to rocks. After working to understand the nature of these natural adhesives, the researchers then generate several synthetic versions with different properties.