Deep Eutectic Solvent Assisted Facile Synthesis of Lignin-Based Cryogel

Journal Article · Thu Dec 20 04:00:00 EST 2018 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.8b02279· OSTI ID:1508519

Lin, Kuan-Ting ^[1]; Ma, Ruoshui ^[2]; Wang, Peipei ^[1]; Xin, Junna ^[3]; Zhang, Jinwen ^[3]; Wolcott, Michael P. ^[3]; Zhang, Xiao ^[2]

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1. Voiland School of Chemical Engineering &, Bioengineering Bioproducts, Science &, Engineering Laboratory, Washington State University, 2710 Crimson Way, Richland, Washington 99354, United States
2. Voiland School of Chemical Engineering &, Bioengineering Bioproducts, Science &, Engineering Laboratory, Washington State University, 2710 Crimson Way, Richland, Washington 99354, United States; Pacific Northwest National Laboratory, Richland, Washington 99354, United States
3. Composite Materials &, Engineering Center, Washington State University, Pullman, Washington 99164, United States

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 m2/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 chloridelactic 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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1508519
• Report Number(s): PNNL-SA-142367
• Journal Information: Macromolecules, Journal Name: Macromolecules Journal Issue: 1 Vol. 52; ISSN 0024-9297
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English