Researchers from the University at Buffalo suggest that wheat straw might be appropriate for use as a sustainable alternative for regulating temperatures in homes and commercial buildings.

Because standard insulating materials tend to demand considerable energy to produce, they subsequently contribute to greenhouse gas emissions.

Source: Douglas Levere

As such, the researchers from the University at Buffalo, found a solution in the form of wheat straw. Specifically, the team 3D-printed wheat straw fibers for use in thermal insulation structures.

“Unlike fossil fuels, which take millions of years to form, biomass materials, such as wheat straw, can be harvested and replanted regularly. This makes for an eco-friendlier insulation material,” explained the researchers.

While wheat straw, which is a byproduct of wheat harvesting, is typically burned after grain collection, the team determined that it could instead be employed as a thermal insulator. Further, the team also determined that the material is capable of withstanding pressure and exhibited greater flame retardancy versus other organic materials. These properties are thanks to wheat straw’s fibrous and porous composition, which reportedly enhances thermal insulation.

To create the wheat straw-based thermal insulation, the team devised a process that involves pulping wheat straw fibers derived from agricultural waste into a slurry, which is subsequently dried, creating thick, 3D-printable inks.

These fibers are then cross-linked via hydrogen bonding between the binder and the straw’s cellulose with an organic binder. These specially treated fibers are formulated into a 3D-printable ink that is designed for use in creating thermal insulation structures, thereby resulting in materials that demonstrate both high mechanical strength and long-term durability.

In addition to insulation, 3D-printed wheat straw could also be used to manufacture custom items like kitchenware and furniture.

“If wheat straw were to be widely adopted. It would not only reduce greenhouse gas emissions, but it would also reduce agricultural waste and provide an environmentally friendly and affordable source of insulation for homes and commercial buildings,” the researchers explained.