Gallium-catalyzed recycling of silicone waste with boron trichloride to yield key chlorosilanes

• 成果类型: Article
• 署名作者: Nam Duc Vu; Boulegue-Mondiere, Aurelie; Durand, Nicolas; Munsch, Josephine; Boste, Mickael; Lhermet, Rudy; Gajan, David; Baudouin, Anne; Roldan-Gomez, Steven; Perrin, Marie-Eve L.; Monteil, Vincent; Raynaud, Jean
• 署名单位: Centre National de la Recherche Scientifique (CNRS); Universite Claude Bernard Lyon 1; Universite Claude Bernard Lyon 1; Centre National de la Recherche Scientifique (CNRS); Ecole Normale Superieure de Lyon (ENS de LYON); Centre National de la Recherche Scientifique (CNRS); CNRS - Institute of Chemistry (INC); Institut National des Sciences Appliquees de Lyon - INSA Lyon; Universite Claude Bernard Lyon 1
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12794
• DOI: 10.1126/science.adv0919
• 发表日期: 2025-04-25
• 页码: 392-400
• 关键词: ionic liquids; basis-sets; depolymerization; polyethylene; kinetics; chloride; methylation; ELEMENTS; benzene; ethyl

摘要

Chemical recycling to monomers is a key strategy for a sustainable circular polymer economy. However, most efforts have focused on polymers with carbon backbones. Recycling of silicone polymers and corresponding materials, featuring a robust inorganic backbone and tunable properties, remains in its infancy. We present a general method for depolymerization of a very wide range of silicone-based materials and postconsumer waste, including end-of-life cross-linked polydimethylsiloxane-based networks within formulated materials. The reaction proceeds at 40 degrees C, harnessing an efficient gallium catalyst for a million-fold rate enhancement and boron trichloride as the chlorine source, to produce nearly quantitative yields of (methyl)chlorosilanes, key intermediates in the Muller-Rochow process that anchors the silicone industry.