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Temperature Responsive Cellulose-graft-Copolymers via Cellulose Functionalization in an Ionic Liquid and RAFT Polymerization

Hufendiek, Andrea ; Trouillet, Vanessa ; Meier, Michael A. R ; Barner-Kowollik, Christopher

Biomacromolecules, 2014-07, Vol.15 (7), p.2563-2572 [Periódico revisado por pares]

Washington, DC: American Chemical Society

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  • Título:
    Temperature Responsive Cellulose-graft-Copolymers via Cellulose Functionalization in an Ionic Liquid and RAFT Polymerization
  • Autor: Hufendiek, Andrea ; Trouillet, Vanessa ; Meier, Michael A. R ; Barner-Kowollik, Christopher
  • Assuntos: Acrylamides - chemistry ; Acrylic Resins - chemistry ; Applied sciences ; Cellulose - analogs & derivatives ; Cellulose - chemical synthesis ; Cellulose and derivatives ; Exact sciences and technology ; Imidazoles - chemistry ; Ionic Liquids - chemistry ; Kinetics ; Natural polymers ; Physicochemistry of polymers ; Polymerization ; Polymers - chemistry ; Temperature
  • É parte de: Biomacromolecules, 2014-07, Vol.15 (7), p.2563-2572
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: Well-defined cellulose-graft-polyacrylamide copolymers were synthesized in a grafting-from approach by reversible addition–fragmentation chain transfer polymerization (RAFT). A chlorine moiety (degree of substitution DS(Cl) ≈ 1.0) was introduced into the cellulose using 1-butyl-3-methylimidazolium chloride (BMIMCl) as solvent before being substituted by a trithiocarbonate moiety resulting in cellulose macro-chain transfer agents (cellulose-CTA) with DS(RAFT) of 0.26 and 0.41. Poly(N,N-diethylacrylamide) (PDEAAm) and poly(N-isopropylacrylamide) (PNIPAM) were subsequently grafted from these cellulose-CTAs and the polymerization kinetics, the molecular weight characteristics and the product composition were studied by nuclear magnetic resonance spectroscopy, X-ray photoelectron spectroscopy, and size exclusion chromatography of the polyacrylamides after cleavage from the cellulose chains. The number-average molecular weights, M n, of the cleaved polymers ranged from 1100 to 1600 g mol–1 for PDEAAm (dispersity Đ = 1.4–1.8) and from 1200 to 2600 g mol –1 for PNIPAM (Đ = 1.7–2.1). The LCST behavior of the cellulose-graft-copolymers was studied via the determination of cloud point temperatures, evidencing that the thermoresponsive properties of the hybrid materials could be finely tuned between 18 and 26 °C for PDEAAm and between 22 and 26 °C for PNIPAM side chains.
  • Editor: Washington, DC: American Chemical Society
  • Idioma: Inglês
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