%0 Journal Article
%T Water-Driven Sol–Gel Transition in Native Cellulose/1-Ethyl-3-methylimidazolium Acetate Solutions
%+ University of Groningen [Groningen]
%+ Leibniz Institute for New Materials (INM)
%+ Laboratoire Charles Coulomb (L2C)
%+ Pennsylvania State University (Penn State)
%A Mohamed Yunus, Roshan Akdar
%A Koch, Marcus
%A Dieudonné-George, Philippe
%A Truzzolillo, Domenico
%A Colby, Ralph, H
%A Parisi, Daniele
%< avec comité de lecture
%@ 2161-1653
%J ACS Macro Letters
%I Washington, D.C : American Chemical Society
%V 13
%P 219-226
%8 2024
%D 2024
%R 10.1021/acsmacrolett.3c00710
%Z Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
%Z Chemical Sciences/PolymersJournal articles
%X The addition of water to native cellulose/1-ethyl-3methylimidazolium acetate solutions catalyzes the formation of gels, where polymer chain-chain intermolecular associations act as cross-links. However, the relationship between water content (Wc), polymer concentration (Cp), and gel strength is still missing. This study provides the fundamentals to design water-induced gels. First, the sol-gel transition occurs exclusively in entangled solutions, while in unentangled ones, intramolecular associations hamper interchain cross-linking, preventing the gel formation. In entangled systems, the addition of water has a dual impact: at low water concentrations, the gel modulus is water-independent and controlled by entanglements. As water increases, more cross-links per chain than entanglements emerge, causing the modulus of the gel to scale as Gp ∼ C p^2 Wc^3.0±0.2. Immersing the solutions in water yields hydrogels with noncrystalline, aggregate-rich structures. Such water-ionic liquid exchange is examined via Raman, FTIR, and WAXS. Our findings provide avenues for designing biogels with desired rheological properties.
%G English
%2 https://hal.science/hal-04426657/document
%2 https://hal.science/hal-04426657/file/ACS-MacroLetters-2024-Daniele.pdf
%L hal-04426657
%U https://hal.science/hal-04426657
%~ CNRS
%~ L2C
%~ UNIV-MONTPELLIER
%~ UM-2015-2021
%~ UM-EPE