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Scientists from the University of Washington have invented new printed circuit boards that could significantly reduce amount of electronic waste. These boards partially turn into jelly, which is easily recycled.
Among other components, printed circuit boards typically have a non-conductive layer that serves as a substrate for the electronic components. It consists of two ingredients: fiberglass and epoxy resin, which are very difficult to separate from each other. This layer is not easy to recycle and is sometimes burned, but the process is environmentally friendly and can also damage electronic components.
Scientists replaced the resin with a polymer known as vitrimer. While the PCB is in use, it remains strong, rigid and non-conductive, allowing the substrate to function just as efficiently.
Once such a vPCB (vitrimer printed circuit board) reaches the end of its use, it is immersed in an organic solvent, which has a relatively low boiling point. When this solvent boils, the vitrimer swells and becomes jelly-like.
All other elements that remain completely intact can be easily separated for reuse. Laboratory experiments have shown that 98% of the vitrimer itself can be reused along with 91% of the solvent.
Such boards can be produced in existing factories and can be recycled over and over again. Scientists estimate that using recycled vPCBs could lead to a 48% reduction in global warming impact and an 81% reduction in carcinogenic emissions compared to traditional boards. The study was published in the journal Nature Sustainability.
The Technology section is published with the support of Favbet Tech
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