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Iron‐catalyzed depolymerization of polysiloxanes to produce dichlorodimethylsilane, diacetoxydimethylsilane, or dimethoxydimethylsilane
Author(s) -
Enthaler Stephan
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41287
Subject(s) - depolymerization , polymer , synthon , catalysis , acetic acid , organic chemistry , chemistry , polymerization , methanol , polymer science , polymer chemistry , materials science
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. 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 depolymerization, means low‐molecular weight synthons are created, which can be polymerized to new polymers to close the cycle. Widely used polymers in modern life times are silicones (polysiloxanes). Based on the intrinsic properties the depolymerization is challenging and only a few high temperature or less environmental‐friendly processes have been reported. In this regard, we have set up a capable low‐temperature protocol for the depolymerization 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 synthesizing new polymers; overall a recycling is feasible. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41287.