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• W2979378531 startingPage "16595" @default.
• W2979378531 abstract "Vitrimers are a new class of polymeric materials that simultaneously offer the desired physical properties of thermosets and malleability/reprocessability of thermoplastics. Despite significant progress being made in the field of vitrimers, there exists a critical need for the development of robust dynamic covalent chemistries for the production of strong and thermally stable vitrimers. In this work, we discovered a new silyl ether metathesis reaction and used it for the preparation of vitrimers with exceptional thermal stability. In small-molecule model studies, we observed that silyl ether motifs directly exchange under anhydrous conditions catalyzed by a Brønsted or Lewis acid catalyst. For initial vitrimer demonstration, a commodity polymer, poly(ethylene-co-vinyl alcohol) (PEOH), was silylated with trimethylsilyl (TMS) groups followed by cross-linking with a bis-silyl ether cross-linker. The resulting thermoset showed exceptional thermal stability while maintaining malleability/reprocessability at elevated temperatures. The vitrimer properties such as recyclability and stress relaxation at various temperatures were carefully investigated. The material was reprocessable at 150 °C while also exhibiting good creep resistance at temperatures below its melting transition (Tm). This work demonstrates the silyl ether metathesis reaction as a new, robust dynamic covalent chemistry to introduce plasticity, reprocessability, and recyclability to thermosets." @default.
• W2979378531 created "2019-10-18" @default.
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• W2979378531 date "2019-10-11" @default.
• W2979378531 modified "2023-10-12" @default.
• W2979378531 title "Direct Silyl Ether Metathesis for Vitrimers with Exceptional Thermal Stability" @default.
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• W2979378531 doi "https://doi.org/10.1021/jacs.9b08876" @default.
• W2979378531 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31603321" @default.
• W2979378531 hasPublicationYear "2019" @default.
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