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Monday, 14 October 2019
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Raw materials & technologies, Raw materials, Coatings binders

Depolymerising polysiloxanes to produce well-defined products

Tuesday, 21 October 2014

Polymers are one of the important pillars of our current society. Besides the great success a matter is the accumulation of huge amounts of end-of-life polymers.

Besides the great success a matter is the accumulation of huge amounts of end-of-life polymers. Source: Few Chemicals

Besides the great success a matter is the accumulation of huge amounts of end-of-life polymers. Source: Few Chemicals

Current waste management bases primarily on landfills, thermal recycling, and down-cycling. Noteworthy, only a small part of the end-of-life materials is recycled by depolymerisation, means low-molecular weight synthons are created, which can be polymerised to new polymers to close the cycle. Widely used polymers in modern life times are silicones (polysiloxanes). Based on the intrinsic properties the depolymerisation is challenging and only a few high temperature or less environmental-friendly processes have been reported.

Recycling is feasible

In this regard, German researchers have set up a capable low-temperature protocol for the depolymerisation of silicones with acid chlorides, acetic acid, or methanol in the presence of cheap iron salts as precatalysts to yield dichlorodimethylsilane, diacetoxydimethylsilane, or dimethoxydimethylsilane as well-defined products. Notably, dichlorodimethylsilane, diacetoxydimethylsilane, and dimethoxydimethylsilane can be useful starting materials for synthesising new polymers; overall a recycling is feasible.

The study is published in: Journal of Applied Polymer Science, Volume 132, Issue 3, January 15, 2015.

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