Future alternatives to fossil fuel-based plastics could be hiding in kitchen cabinets and waste bins. Researchers are looking to foodstuffs as starting ingredients for polymer-based materials, including coffee grounds, tomato peels and gluten. New products made from these sustainable resources are reported in three papers recently published in ACS journals.
- Coffee grounds to coffee tables. Researchers have created a material suitable for large-format 3D printing by mixing leftover grounds into biobased polylactic acid. As a proof of concept, the team used the plastic composite to 3D print a life-sized side table, as described in the open access journal ACS Omega.
- Tomato peels to high-tech bioplastic. A study in ACS Sustainable Chemistry & Engineering details a tomato-based polyester plastic that remembers its previous shapes. A ring made of the yellow material was warped at a high temperature, then placed in a warm water bath set at 140 degrees Fahrenheit, where it snapped back to its original desired shape. This proof-of-concept shows how biobased polyesters could be made with an abundant agricultural and food waste.
- Gluten to a compostable composite. A team created the biobased composite by combining wheat gluten — sometimes added to bread dough for extra chewiness — and carbon fibers. The research reported in the open access journal ACS Omega illustrates how the gluten-based material had a similar strength to fossil fuel-based plastics, yet broke down within 30 days in soil and didn’t impact either the germination or growth of grass seeds. The team says the design could allow future items to be molded into any shape or size.
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