A fundamental understanding of whole biomass dissolution in ionic liquid for regeneration of fiber by solution-spinning

Nguyen, Ngoc A.; Kim, Keonhee; Bowland, Christopher C.; Keum, Jong K.; Kearney, Logan T.; André, Nicolas; Labbé, Nicole; Naskar, Amit K.

doi:10.1039/C9GC00774A

Title: A fundamental understanding of whole biomass dissolution in ionic liquid for regeneration of fiber by solution-spinning

Journal Article · 19 June 2019 · Green Chemistry

DOI: https://doi.org/10.1039/C9GC00774A · OSTI ID:1557507

^[1]; Kim, Keonhee ^[2];

^[1];

^[1]; Kearney, Logan T. ^[1]; André, Nicolas ^[2];

^[2];

^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Materials made from renewable resources are interesting and attractive substitutes for petroleum-based materials. Recently, regeneration of cellulose fibers using ionic liquids (ILs) as green solvents has been a topic of interest to both industrial and academic sectors. However, extraction of cellulose from lignocellulosic biomass requires numerous energy intensive processing steps. Additionally, the deconstruction and removal of lignin and hemicellulose components from lignocellulosic biomass usually involve corrosive pretreatment and the solvation of specific biomass components. Instead, utilization of the whole biomass—particularly woody residues—to manufacture high-performance materials offers an attractive value-proposition. In this study, we demonstrated fiber regeneration of whole hybrid poplar (HP) biomass by a sustainable method. We developed an environmentally friendly approach by partially auto-hydrolyzing the biomass with water before its dissolution in 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]) ionic liquid, for large-scale, roll-to-roll production of fibers by solution spinning. We discuss, for the first time, a fundamental understanding of the inter- and intramolecular interactions in HP biomass–IL solutions, as well as their corresponding spinnability, structural reformation, and mechanical performance of the regenerated fibers. Particularly, the molecular alignment, recrystallization, and crystallinity of the spun fibers were correlated to the chain entanglement, molecular relaxation, and rheological properties of the HP biomass–IL solutions. A window of entangled concentration (4–6.5 wt%) of biomass in the IL was determined to be favorable for fiber spinning.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1557507

Journal Information:: Green Chemistry, Journal Name: Green Chemistry Journal Issue: 16 Vol. 21; ISSN GRCHFJ; ISSN 1463-9262

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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