MIT engineers developed an elastic yarn made from two types of polyethylene, enabling stretch fabrics to be recycled without separating blended fibers and retaining performance after repeated remelting.
Each year, the average person in the United States discards about 81 pounds of clothing—a steady stream of textile waste that is difficult to recycle with today’s infrastructure. One major obstacle is the way many modern fabrics are engineered: stretch materials often rely on blends that are tough to disentangle once a garment reaches the end of its life.
Engineers at MIT say they have developed a potential workaround: a new kind of yarn designed to be both elastic and recyclable without requiring complex separation steps. Conventional stretchy yarns commonly pair spandex with polyester or nylon. Those mixed materials deliver useful performance, but they create a recycling headache because the different fibers typically must be isolated before they can be reused—an approach that is often impractical at scale.
The MIT team’s alternative uses two different forms of polyethylene, a plastic widely used in everyday products such as milk jugs and grocery bags. By building the yarn from polymers that sit within the same chemical family, the researchers aim to simplify what happens after a garment is worn out. Instead of trying to separate incompatible fibers, the material can be processed together: it can be melted down in its existing form.
Svetlana Boriskina, a research scientist in MIT’s Department of Mechanical Engineering who led the work, says the vision is a garment that can be turned back into usable fiber rather than landfilled or incinerated. In that scenario, clothing made from the polyethylene-based yarn could be collected, shipped to a recycling facility, melted, and then spun again into fresh yarn for new textiles.
In tests, the researchers found that the polyethylene yarn holds up through repeated reuse. Even after 10 rounds of melting and respinning, the material maintained strength and stretch comparable to conventional thread, according to the team. That durability matters because recycling processes can degrade many materials over time, limiting how often they can be reused before performance drops.
For now, the research is moving from materials development toward manufacturing potential. “Now we have something that can be knitted and woven,” Boriskina said, describing progress toward producing fabrics that can be made with standard textile techniques.
Longer term, the team hopes the approach could support a more circular textile economy—one in which discarded garments become feedstock for the next generation of clothing. In the ideal end-of-life pathway, a polyethylene garment could be deposited into a collection bin and routed into an established recycling stream, cutting waste while retaining value in the material.
Why it matters
Textile waste is a growing environmental burden, and blended stretch fabrics are among the hardest items to recycle. A recyclable elastic yarn could help brands and municipalities reduce landfill-bound clothing by making “melt and remake” processing more feasible. The next key questions are whether the material can scale economically and whether collection and sorting systems can adapt to handle garments designed for this kind of closed-loop recycling.