Illinois University Researchers materials not only heal, regenerate

Newly developed regenerating material grows back after damage

5:09 AM, 10th May 2014
University of Illinois research news
Healing chemicals arrive via capillaries (the red and blue vertical lines) and form a gel that seals the gap.

CHAMPAIGN, US: Researchers at University of Illinois have developed materials that not only heal, but regenerate. Until now, self-repairing materials could only bond tiny microscopic cracks. The new regenerating materials fill in large cracks and holes by regrowing material. The research team led by Professor Scott White, comprises of professors Jeffry S Moore and Nancy Sottos and graduate students Brett Krull, Windy Santa Cruz and Ryan Gergely.

“We have demonstrated repair of a nonliving, synthetic materials system in a way that is reminiscent of repair-by-regrowth as seen in some living systems,” said Moore, Professor, University of Illinois.

Such self-repair capabilities would be a boon not only for commercial goods – imagine a mangled car bumper that repairs itself within minutes of an accident – but also for parts and products that are difficult to replace or repair, such as those used in aerospace applications.

The regenerating capabilities build on the team’s previous work in developing vascular materials. Using specially formulated fibre that disintegrate, the researchers can create materials with networks of capillaries inspired by biological circulatory systems.

“Vascular delivery lets us deliver a large volume of healing agents – which, in turn, enables restoration of large damage zones. The vascular approach also enables multiple restorations if the material is damaged more than once,” said Sottos, Professor, University of Illinois.

For regenerating materials, two adjoining, parallel capillaries are filled with regenerative chemicals that flow out when damage occurs. The two liquids mix to form a gel, which spans the gap caused by damage, filling in cracks and holes. Then the gel hardens into a strong polymer, restoring the plastic’s mechanical strength.

“We have to battle a lot of extrinsic factors for regeneration, including gravity. The reactive liquids we use form a gel fairly quickly, so that as it’s released it starts to harden immediately. If it didn’t, the liquids would just pour out of the damaged area and you’d essentially bleed out. Because it forms a gel, it supports and retains the fluids. Since it’s not a structural material yet, we can continue the regrowth process by pumping more fluid into the hole,” said White.

The team demonstrated their regenerating system on the two biggest classes of commercial plastics: thermoplastics and thermosets. The researchers can tune the chemical reactions to control the speed of the gel formation or the speed of the hardening, depending on the kind of damage. For example, a bullet impact might cause a radiating series of cracks as well as a central hole, so the gel reaction could be slowed to allow the chemicals to seep into the cracks before hardening.

The researchers envision commercial plastics and polymers with vascular networks filled with regenerative agents ready to be deployed whenever damage occurs, much like biological healing. Their previous work established ease of manufacturing, so now they are working to optimize the regenerative chemical systems for different types of materials.

“For the first time, we’ve shown that you can regenerate lost material in a structural polymer. Prior to this work, if you cut off a piece of material, it’s gone. Now we’ve shown that the material can actually regrow,” said White.

 

© University of Illinois News

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