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| 2023-09-17 12:56:49 | onclick： | Ph.D. in Engineering finds non-toxic bionic adhesives |
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Without adhesives, much of modern human civilization, including cell phones, cars, furniture, walls and parcels delivered to the door, would fall apart.The problem with these adhesives, however, is that they are unsustainable.A team of chemists at Purdue University in the US wants to change this with a new, fully sustainable bonding system.Inspired by shellfish, they developed a new type of glue that is stronger and more sustainable.The findings were published Sept. 13 in the journal Nature.
Inspired by the natural world, Jonathan Wilk, professor of chemistry at Purdue University, has developed a non-toxic, environmentally friendly adhesive that can be used as an alternative to traditional toxic, non-biodegradable adhesives
Jonathan Wilk, professor of chemistry at Purdue University's School of Science and Material Engineering, says current adhesives cause a variety of environmental problems, almost all of which are petroleum-based, non-degradable and non-recoverable.Volatile petrochemicals in these adhesives can be toxic, such as building materials plywood, which is formed by bonding pieces of wood to formaldehyde-based adhesives.The new house releases formaldehyde, which can expose residents to this carcinogen.In addition, discarded adhesive products can exist for centuries and produce microplastics that pollute the ocean.
Wilk's laboratory analyzed marine animals such as mussels and oysters. After experimenting with a range of different biological sources and sustainable ingredients, the team identified epoxy soy oil as the main ingredient.They added it to malic acid, followed by tannic acid.Together, these three ingredients create a substance similar to mussels that attach themselves to rocks, creating an inexpensive, effective, scalable, practical and fully sustainable adhesive.
All the ingredients in the new adhesives are biologically based, safe and easy to manufacture, essentially mixing and heating them.Other biological compounds can also be used in conjunction with epoxide soy oil to produce a new range of sustainable adhesives.
To test the properties of the adhesive, the researchers bonded wood, plastic or metal together and used an instrument to break it to measure the adhesion.In most cases, new adhesives perform well, sometimes even better than toxic adhesives such as strong adhesives.
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