Cross-linked polymeric materials are utilized in numerous consumer and industrial applications due to their unique properties. However, these materials require harsh chemical treatments in order to degrade their cross-linked networks, leading to environmental and safety issues. This work describes the first silyl-containing polyurethane thermosets, formed from aliphatic isocyanates and synthesized silyl-diols with different electrophilicity and chain lengths to control disassembly rates. The synthesized thermosets displayed high thermal stability, rigidity, and high cross-link density, yet have the ability to disassemble via cascading bond cleavage in multiple directions upon exposure to a selective and mild chemical stimulus. Disassembly was initiated by reaction with fluoride ion to release small molecules. Unlike previously reported degradable cross-linked materials, the silyl-containing thermosets were resistant to disassembly with strong acid and base, displaying their selectivity and robustness. This technology has numerous potential applications, such as in the selective removal of coatings from organic composites.

Cross-linked polymer networks that selectively and controllably disassemble on-demand via cascading bond cleavage

256th National Meeting (2018)

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