Harvard Researchers Develop Tough, Self-Healing Rubber

August 14, 2017

Self-healing rubber links permanent covalent bonds (red) with reversible hydrogen bonds (green).
[Image courtesy of Peter and Ryan Allen/Harvard SEAS]

Imagine a tire that could heal after being punctured or a rubber band that never snapped.

Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have developed a new type of rubber that is as tough as natural rubber but can also self-heal.

The research is published in Advanced Materials.*

Self-healing materials aren’t new โ€” researchers at SEAS have developed self-healing hydrogels, which rely on water to incorporate reversible bonds that can promote healing. However, engineering self-healing properties in dry materials โ€” such as rubber โ€” has proven more challenging. That is because rubber is made of polymers often connected by permanent, covalent bonds. While these bonds are incredibly strong, they will never reconnect once broken.

In order to make a rubber self-healable, the team needed to make the bonds connecting the polymers reversible, so that the bonds could break and reform.

"Previous research used reversible hydrogen bonds to connect polymers to form a rubber but reversible bonds are intrinsically weaker than covalent bonds," said Li-Heng Cai, a postdoctoral fellow at SEAS and corresponding author of the paper. "This raised the question, can we make something tough but can still self-heal?"

Cai, along with Jinrong Wu, a visiting professor from Sichuan University, China, and senior author David A. Weitz, Mallinckrodt Professor of Physics and Applied Physics, developed a hybrid rubber with both covalent and reversible bonds.

Continue reading "Harvard researchers develop tough, self-healing rubber" by Leah Burrows, August 14, 2017. http://www.seas.harvard.edu/news/2017/08/harvard-researchers-develop-tough-self-healing-rubber.

*Jinrong Wu, Li-Heng Cai, David A. Weitz, "Tough Self-Healing Elastomers by Molecular Enforced Integration of Covalent and Reversible Networks," Advanced Materials (11 August 2017) DOI: 10.1002/adma.201702616.