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Surface Modification of Cellulose Nanocrystals via RAFT Polymerization of CO2-Responsive Monomer-Tuning Hydrophobicity.
Arredondo, Joaquin; Woodcock, Nicole M; Garcia-Valdez, Omar; Jessop, Philip G; Champagne, Pascale; Cunningham, Michael F.
Afiliación
  • Arredondo J; Department of Chemical Engineering, Queen's University, 19 Division Street, Kingston, Ontario K7L 3N6, Canada.
  • Woodcock NM; Department of Chemical Engineering, Queen's University, 19 Division Street, Kingston, Ontario K7L 3N6, Canada.
  • Garcia-Valdez O; Department of Chemical Engineering, Queen's University, 19 Division Street, Kingston, Ontario K7L 3N6, Canada.
  • Jessop PG; Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada.
  • Champagne P; Department of Civil Engineering, Queen's University, 58 University Avenue, Kingston, Ontario K7M 9H7, Canada.
  • Cunningham MF; Department of Chemical Engineering, Queen's University, 19 Division Street, Kingston, Ontario K7L 3N6, Canada.
Langmuir ; 36(46): 13989-13997, 2020 Nov 24.
Article en En | MEDLINE | ID: mdl-33186049
Cellulose nanocrystals (CNCs) were converted into a CO2-responsive composite nanomaterial by grafting poly(dimethylaminoethyl methacrylate) (PDMAEMA), poly(diethylaminoethyl methacrylate) (PDEAEMA), and poly(diisopropylaminoethyl methacrylate) (PDPAEMA) onto its surface using both grafting-to and grafting-from approaches. The zeta potential (ζ) of the graft-modified CNC could be reversibly switched by protonation/deprotonation of the tertiary amine groups simply by sparging with CO2 and N2, respectively. Depending on the grafting density and the molecular weight of the polymer grafts, CNC can form stable aqueous dispersions at either mildly acidic pH (under CO2) or mildly basic (under N2) conditions. Moreover, it was also determined that the CNC hydrophobicity, assessed using phase-shuttling experiments at different pH values, was also dependent on both the grafting density and molecular weight of the polymer grafts, thereby making it possible to easily tune CNC dispersibility and/or hydrophobicity.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Langmuir Asunto de la revista: QUIMICA Año: 2020 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Langmuir Asunto de la revista: QUIMICA Año: 2020 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos