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New Sandia Labs molecule could improve durability of polymers

A team at Sandia National Laboratories has developed a molecule that helps change the way some polymer materials react to temperature fluctuations, which makes them more durable. It’s an application that could be used in everything from plastic phone cases to missiles.

Polymers, which include various forms of plastics, are made up of many smaller molecules, bonded together. This bond makes them especially strong and an ideal product to be used to protect delicate components in a wide variety of items. But with time, use and exposure to different environments, all materials begin to deteriorate.

One of the biggest factors in materials deterioration is repeated exposure from hot to cold temperatures and back. Most materials expand when heated and contract when cooled, but each material has its own rate of change. Polymers, for example, expand and contract the most, while metals and ceramics contract the least.

Erica Redline, a materials scientist who leads the Sandia team, said most items are made up of more than one kind of material.

Take for example, your phone, which has a plastic housing, coupled to a glass screen, and inside that, the metals and ceramics that make up the circuitry. These materials are all screwed, glued or somehow bonded together and will start expanding and contracting at different rates, putting stresses on one another which can cause them to crack or warp over time.

—Erica Redline

The team modified a molecule so that it can easily be incorporated into a polymer to change its properties.

This really is a unique molecule that when you heat it up, instead of it expanding, it actually contracts by undergoing a change in its shape. When it’s added to a polymer, it causes that polymer to contract less, hitting expansion and contraction values similar to metals. To have a molecule that behaves like metal is pretty remarkable.

—Erica Redline

This molecule could be used in endless ways. Polymers are used as protective coatings in electronics, communications systems, solar panels, automotive components, printed circuit boards, aerospace applications, defense systems, flooring and more.

Another key to this invention is that it can be incorporated into different parts of a polymer at different percentages, in 3D printing.

Another benefit is helping reduce the weight of materials by eliminating heavy fillers.

Redline said she has also been approached by an epoxy formulator who believes this molecule could be incorporated into adhesives.

The team has only created this molecule in small quantities, but they are working to find a way to scale up production so that other Sandia researchers can test the molecule to fit mission needs.

Chad Staiger, an organic chemist at Sandia, makes the molecule. He said it takes him about 10 days to make between 7-10 grams.

It’s unfortunately a long synthesis for this molecule. More steps equal more time and more money. You usually see five- to six-step syntheses in higher value materials such as pharmaceuticals. In polymers, the cheaper the better for wide scale adoption.

—Chad Staiger

The team is working to reduce the steps using $100,000 in funding through Sandia’s technology maturation program, which helps ready products for the marketplace.

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