Grafting onto microfibrils of native cellulose

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Abstract

Attempts to modify the surface of oxidized cellulose microfibrils were made using amine terminated molecules. First, native cellulose was oxidized with catalytic amounts of 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO), sodium hypochlorite and sodium bromide in water. The primary alcohol moieties were selectively oxidized into carboxyl groups. Then, the oxidized cellulose was coupled with amines derivatives by a peptidic reaction by using carbodiimide and hydroxysuccimide as catalyst and amidation agent. The obtained coupled cellulose showed low polarity, with stability in non-polar solvents. The products were characterized by FTIR, (13)C NMR, rheology and conductometric titration as well as transmission electron microscopy. Their hydrophobic character was evaluated by observing their behavior in polar and non-polar solvents.

Original languageEnglish
Pages (from-to)571-580
Number of pages10
JournalCellulose
Volume15
Issue number4
DOIs
Publication statusPublished - Aug 2008

Keywords

  • cellulose
  • microfibrils
  • oxidation
  • peptidic reaction
  • hydrophobic
  • TEMPO-MEDIATED OXIDATION
  • CHEMICAL-MODIFICATION
  • SURFACE TREATMENTS
  • COMPOSITES
  • WHISKERS
  • FIBERS
  • FLOUR
  • ACID

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