4.7 Article

Deep Eutectic Solvent Assisted Facile Synthesis of Lignin-Based Cryogel

期刊

MACROMOLECULES
卷 52, 期 1, 页码 227-235

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AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.8b02279

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  1. National Science Foundation [1454575]
  2. Directorate For Engineering
  3. Div Of Chem, Bioeng, Env, & Transp Sys [1454575] Funding Source: National Science Foundation

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In this study, we reported a method to prepare a lignin based cryogel by cross-linking deep eutectic solvent (DES) extracted lignin and formaldehyde as an alternative to replace resorcinol-formaldehyde (RF) based aerogel. The resulting lignin-formaldehyde cryogel has a highly porous structure (172.8 m(2)/g surface area) with a high dimension stability. We found that the hydroxyl group and carbonyl group of DES lignin provide reactive sites to cross-link with formaldehyde through electrophilic addition and aldol condensation reaction. We also found that using choline chloride lactic acid (ChCl-Lac) DES as a solvent during the lignin-formaldehyde cryogel formation is critical to prevent the shrinkage of the final cyrogel. The ensuing lignin-formaldehyde cryogel has promising properties such as high thermostability, low thermal conductivity, and good fire retardancy.

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