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Home » Insights

3D Printed Self-Healing Polymers For More Realistic Prosthetics

Insights By AM Chronicle EditorSeptember 24, 20204 Mins Read
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The self-healing polymers, which are 3D printable, recyclable, and come in a range of textures—from extremely soft to rigid.

Researchers have developed a new family of self-healing polymers they believe can help in the production of more realistic, human-like prosthetics.

A team at Texas A&M University, working with the U.S. Army Combat Capabilities Development Command Army Research Laboratory, tweaked the chemistry of a single polymer to develop the new materials, which are 3D printable, self-healing, and recyclable.

The materials also come in a range of textures, from extremely soft to rigid, as well as naturally adhere to each other in air or even underwater.

This combination of features is what makes the new polymer family well-suited for a variety of applications, such as developing more realistic prosthetics and soft robotics that not only have more flexibility but also can self-heal, said Svetlana Sukhishvili, a professor in the Department of Materials Science and Engineering.

They also have the potential for military applications, which is one of the reasons the Army collaborated on the research. Some uses the Army is eyeing for the materials are agile platforms for air vehicles as well as more futuristic designs, such as aircraft wings that can self-heal.

New Material Exploration

Much of the research into elastic polymers deals with the crosslinks of the repeating molecular motifs found in the material, which are like beads in a chain. These chains are crosslinked, which is what gives these types of polymers their elasticity. Crosslinks also can make elastomers more rigid if scientists increase the number of crosslinks in the material.

Previous research to manipulate the density of crosslinks in elastomers have made them stiffer, a mechanical change that was generally permanent, Sukhishvili observed.

“Crosslinks are like stitches in a piece of cloth, the more stitches you have, the stiffer the material gets and vice versa,” she said in a press statement. “But instead of having these ‘stitches’ be permanent, we wanted to achieve dynamic and reversible crosslinking so that we can create materials that are recyclable.”

To achieve their goal, researchers turned their attention to the molecules involved in the crosslinking, first focusing on a parent polymer, called prepolymer. Then chemically prepolymer chains with two types of small crosslinking molecules—furan and maleimide.

The team found that by increasing the number of these molecules in the prepolymer, the materials would stiffen; the hardest material they created with this tweak was 1,000 times stronger than the softest, researchers said.

Self-Healing Process

Moreover, Furan and maleimide participate in a type of reversible chemical bonding, which makes the crosslinks also reversible. This is because the reaction causes furan and maleimide pairs to “click” and “unclick” depending on temperature.

A high temperature splits the molecules from the polymer chains, which softens the materials, researchers discovered. Room temperature hardens the materials, since the molecules quickly click back together, once again forming crosslinks.

The result of these reactions that if the material is torn in any way at ambient temperature, the furan, and maleimide in the polymer automatically re-click, healing the material within a few seconds.

“Right now, we can easily achieve around 80% self-healing at room temperature, but we would like to reach 100%,” Frank Gardea, a research engineer in the United States Army Research Laboratory, said in a press statement.

Self-Healing Polymers
Self-Healing Polymers

3D Possibilities

Another observation made by the researchers was that the temperatures at which the crosslinkers dissociate or unclick from the prepolymer chains are relatively the same for different stiffness levels—a useful property for 3D printing with them, he said. That’s because the materials can be melted at the same temperature and then used as printing ink regardless of whether they are soft or hard, Gardea said.

“By modifying the hardware and processing parameters in a standard 3D printer, we were able to use our materials to print complex 3D objects layer by layer,” he said in a press statement. “The unique advantage of our materials is that the layers that make up the 3D part can be of vastly different stiffness.”[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column][vc_video link=”https://youtu.be/odBrB04w2xI”][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]Click here for more information.[/vc_column_text][/vc_column][/vc_row]

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AM Chronicle Editor
3d printing additive manufacturing AM Polymer Research Self-healing polymer Texas A&M University
AM Chronicle Editor

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