GoKawiilResearchers develop chemical process to break silicones back into dichlorosilane monomers
Scientists have reported a new depolymerization method that uses silylium-ion catalysis with phosgene-type deoxygenative chlorinating agents to cleave Si–O–Si bonds in silicone polymers under mild conditions. The reaction converts linear and cyclic siloxanes, including commercial silicone oils and elastomers, back into dichlorosilane, the industrial building-block monomer used to manufacture new silicones.
GoKawiil's interpretation of the reporting above, not reported fact.
Silicones are prized for durability and chemical resistance, but those same properties have made them notoriously difficult to recycle, with most waste currently landfilled, incinerated, or only partially broken down into cyclic siloxanes. A method that regenerates the original monomer could allow silicone waste to be converted back into virgin-quality material, potentially supporting a more circular manufacturing loop for an otherwise hard-to-recycle class of polymers. The researchers' mechanistic work also clarifies how chlorocarbonyl cations drive the cleavage, which could inform further catalyst or process design.
- New process converts silicone polymers back into dichlorosilane monomer using silylium-ion catalysis and chlorinating agents.
- Method works on diverse substrates, including commercial silicone oils and elastomers, under mild reaction conditions.
- Findings offer a potential route to true feedstock recycling of silicones, unlike current landfill, incineration or cyclic-siloxane recycling methods.
Source: nature.com — Xu, 2026-10-28
Published there as: “Back-to-monomer depolymerization of silicones by deoxygenative chlorination”
Read the original report → The summary and analysis above are GoKawiil's own, written from reporting by the source above. Facts and quotes belong to the original publisher.