Chemical modification of pulp fibers by TEMPO-mediated oxidation

Takuya Kitaoka, Akira Isogai, Fumihiko Onabe

Research output: Contribution to journalArticle

123 Citations (Scopus)

Abstract

A bleached hardwood kraft pulp was oxidized with TEMPO (2,2,6,6-tetrametyl-1-piperidinyloxy radical), NaBr and NaClO in pulp suspensions at pH 10.5 and 20 °C for 2 h. The carboxyl content of the oxidized pulp increased up to 0.47 mmol/g by the TEMPO-mediated oxidation, which was about eight times as much as that of the original pulp. Viscosity measurement of the oxidized pulps showed that some depolymerization occurred on the kraft pulp during the oxidation. Water retention values of the oxidized pulps were almost equal to that of the original pulp. When handsheets were prepared from the oxidized pulps, apparent density, tearing index and folding endurance of the handsheets were roughly constant in the range of carboxyl content from 0.06 to 0.47 mmol/g. On the other hand, the introduction of carboxyl groups had some influences on dry tensile index, elongation at the breaking point, Young's modulus and opacity of the handsheets prepared thereof. When a polyamideamine-epichlorohydrin (PAE) resin was added to pulp suspensions, higher retention of PAE was achieved by using the oxidized pulp and the maximum wet strength was obtained for the oxidized pulp with carboxyl content of 0.12 mmol/g. Probably, the introduction of carboxyl groups into the pulp increases opportunity of electrostatic interactions between anionic pulp fibers and cationic PAE molecules in pulp suspensions. When the oxidized pulp had carboxyl content greater than 0.2 mmol/g, however, wet strength of the handsheets decreased.

Original languageEnglish
Pages (from-to)279-284
Number of pages6
JournalNordic Pulp and Paper Research Journal
Volume14
Issue number4
Publication statusPublished - Dec 1 1999

Fingerprint

pulp fiber
Chemical modification
Pulp
pulp
oxidation
Oxidation
Fibers
Epichlorohydrin
kraft pulp
Suspensions
Kraft pulp
fibre
chemical
electrostatic interactions
opacity
depolymerization
Depolymerization
Hardwoods
Viscosity measurement
Opacity

All Science Journal Classification (ASJC) codes

  • Forestry
  • Materials Science(all)

Cite this

Chemical modification of pulp fibers by TEMPO-mediated oxidation. / Kitaoka, Takuya; Isogai, Akira; Onabe, Fumihiko.

In: Nordic Pulp and Paper Research Journal, Vol. 14, No. 4, 01.12.1999, p. 279-284.

Research output: Contribution to journalArticle

Kitaoka, Takuya ; Isogai, Akira ; Onabe, Fumihiko. / Chemical modification of pulp fibers by TEMPO-mediated oxidation. In: Nordic Pulp and Paper Research Journal. 1999 ; Vol. 14, No. 4. pp. 279-284.
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