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How do you make adhesives for electronics, vehicles and construction tougher? By making them weaker. That’s the proposed solution from a Purdue University (West Lafayette, Ind., U.S.) research team — well-known for its adhesive technology.

“We have been using inspiration from sea creatures to develop several new adhesives,” says Jonathan Wilker, a Purdue professor of chemistry and materials engineering, who helps lead the research team. 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 Purdue team’s work is published in the .

 

Managing how energy moves in adhesives 

“The idea is somewhat similar to how a brick wall is made of bricks that are offset from each other,” says Wilker. “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.”

“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.”

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.

 

Toxin-free adhesives

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.

They have worked to patent several of their toxin-free adhesive systems with the Purdue Research Foundation Office of Technology Commercialization (OTC). The researchers are looking for partners to continue developing their technology. For more information on licensing and other opportunities, contact Joseph Kasper of OTC at jrkasper@prf.org.

Read the paper abstract below.