Glue holds the world together. Without adhesives, much of modern human civilization—including our cellphones, cars, furniture, walls and the packages arriving on our doorstep—would simply fall apart.
"Our current adhesives create all sorts of environmental problems," Wilker said."Almost all glues are petroleum-based and do not degrade. The bonded materials in our products stay stuck together. Consequently, we cannot recycle many of the materials that we put into our recycling bins. Discarded products will sit in landfills for centuries and, sometimes, contribute to ocean microplastics.
These substances are harmful both to the environment and to human health. However, people and companies are accustomed to using traditional adhesives; they're strong, easy to produce and relatively inexpensive. Any new adhesive must work at least as well as traditional products, which is why Wilker keeps that drawer around: to test them, side by side, against innovative substances.
After a series of experiments on a range of different biologically-sourced and sustainable ingredients, the team settled on epoxidized soy oil for a main component. Epoxidized soy oil is already produced globally on a massive scale. For their work, the smallest container that they could purchase was a 55-gallon drum of the substance. Since each experiment uses just a little epoxidized soy oil, the level in their drum has dropped only a few inches after several years of testing.
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