A molecular additive allows different kinds of plastic to be recycled together
Soda bottles, sour cream containers and disposable cutlery—these plastics typically arrive at recycling plants mixed together in the same bin. But because they are made of different molecular building blocks, called monomers, they must be sorted into different streams before they can be melted to make new products.
A disturbingly small portion of our plastic waste is recycled, and production of new plastic—made from fossil fuels—continues to increase. The worsening situation has prompted scientists to seek new solutions to old recycling problems, including the difficulty of recycling mixed plastics. But they have faced a fundamental chemical hurdle: when different plastics are melted together, their various monomers tend to separate from one another like oil and water.
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