The influence of high defibration temperature on the properties of medium-density fiberboard (MDF) made from laccase-treated softwood fibers

P. Widsten (Corresponding Author), S. Tuominen, Pia Qvintus-Leino, J.E. Laine

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)

Abstract

This study was carried out to elucidate the effect of defibration temperature in the range 171–202°C on the properties of 12-mm thick MDF boards made without synthetic resins from softwood fibers activated by laccase treatment for the generation of phenoxy radicals on the fiber surfaces. Laccase treatment generated radicals in the fibers. An increase in defibration temperature improved the reactivity of fibers during laccase-catalyzed oxidation. The number of radicals detected in the fibers after laccase treatment in water suspension and the fiber oxygen consumption during the treatments increased with an increase in defibration temperature, while a concurrent improvement was observed in the mechanical strength and thickness swell of dry-process MDF boards made from fibers refined at different temperatures and treated with laccase in the refiner blowline. The different fiber reactivities or board properties were not due to a presence of different amounts of lignin remaining on the fiber surfaces after acetone extraction. The probable reason for them was the fact that the amount of low-molecular weight lignin, a reactive substrate for laccase, increases with increasing defibration temperature. The adhesion occurring during pressing is thus likely to involve coupling or other reactions of radicals located on adjacent fibers, whereby interfiber covalent bonds are formed.
Original languageEnglish
Pages (from-to)521 - 528
Number of pages8
JournalWood Science and Technology
Volume38
Issue number7
DOIs
Publication statusPublished - 2004
MoE publication typeNot Eligible

Fingerprint

medium density fiberboards
Laccase
laccase
Softwoods
softwood
Fibers
temperature
Temperature
lignin
refiners
Lignin
pressing
water treatment
acetone
oxygen consumption
resins
adhesion
fibre
Synthetic Resins
Synthetic resins

Keywords

  • boards
  • fiberboards
  • MDF
  • defibration
  • laccase
  • heat treatment

Cite this

@article{4ebb3e2e91e542ce9223b33be96be06d,
title = "The influence of high defibration temperature on the properties of medium-density fiberboard (MDF) made from laccase-treated softwood fibers",
abstract = "This study was carried out to elucidate the effect of defibration temperature in the range 171–202°C on the properties of 12-mm thick MDF boards made without synthetic resins from softwood fibers activated by laccase treatment for the generation of phenoxy radicals on the fiber surfaces. Laccase treatment generated radicals in the fibers. An increase in defibration temperature improved the reactivity of fibers during laccase-catalyzed oxidation. The number of radicals detected in the fibers after laccase treatment in water suspension and the fiber oxygen consumption during the treatments increased with an increase in defibration temperature, while a concurrent improvement was observed in the mechanical strength and thickness swell of dry-process MDF boards made from fibers refined at different temperatures and treated with laccase in the refiner blowline. The different fiber reactivities or board properties were not due to a presence of different amounts of lignin remaining on the fiber surfaces after acetone extraction. The probable reason for them was the fact that the amount of low-molecular weight lignin, a reactive substrate for laccase, increases with increasing defibration temperature. The adhesion occurring during pressing is thus likely to involve coupling or other reactions of radicals located on adjacent fibers, whereby interfiber covalent bonds are formed.",
keywords = "boards, fiberboards, MDF, defibration, laccase, heat treatment",
author = "P. Widsten and S. Tuominen and Pia Qvintus-Leino and J.E. Laine",
year = "2004",
doi = "10.1007/s00226-003-0206-4",
language = "English",
volume = "38",
pages = "521 -- 528",
journal = "Wood Science and Technology",
issn = "0043-7719",
publisher = "Springer",
number = "7",

}

The influence of high defibration temperature on the properties of medium-density fiberboard (MDF) made from laccase-treated softwood fibers. / Widsten, P. (Corresponding Author); Tuominen, S.; Qvintus-Leino, Pia; Laine, J.E.

In: Wood Science and Technology, Vol. 38, No. 7, 2004, p. 521 - 528.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The influence of high defibration temperature on the properties of medium-density fiberboard (MDF) made from laccase-treated softwood fibers

AU - Widsten, P.

AU - Tuominen, S.

AU - Qvintus-Leino, Pia

AU - Laine, J.E.

PY - 2004

Y1 - 2004

N2 - This study was carried out to elucidate the effect of defibration temperature in the range 171–202°C on the properties of 12-mm thick MDF boards made without synthetic resins from softwood fibers activated by laccase treatment for the generation of phenoxy radicals on the fiber surfaces. Laccase treatment generated radicals in the fibers. An increase in defibration temperature improved the reactivity of fibers during laccase-catalyzed oxidation. The number of radicals detected in the fibers after laccase treatment in water suspension and the fiber oxygen consumption during the treatments increased with an increase in defibration temperature, while a concurrent improvement was observed in the mechanical strength and thickness swell of dry-process MDF boards made from fibers refined at different temperatures and treated with laccase in the refiner blowline. The different fiber reactivities or board properties were not due to a presence of different amounts of lignin remaining on the fiber surfaces after acetone extraction. The probable reason for them was the fact that the amount of low-molecular weight lignin, a reactive substrate for laccase, increases with increasing defibration temperature. The adhesion occurring during pressing is thus likely to involve coupling or other reactions of radicals located on adjacent fibers, whereby interfiber covalent bonds are formed.

AB - This study was carried out to elucidate the effect of defibration temperature in the range 171–202°C on the properties of 12-mm thick MDF boards made without synthetic resins from softwood fibers activated by laccase treatment for the generation of phenoxy radicals on the fiber surfaces. Laccase treatment generated radicals in the fibers. An increase in defibration temperature improved the reactivity of fibers during laccase-catalyzed oxidation. The number of radicals detected in the fibers after laccase treatment in water suspension and the fiber oxygen consumption during the treatments increased with an increase in defibration temperature, while a concurrent improvement was observed in the mechanical strength and thickness swell of dry-process MDF boards made from fibers refined at different temperatures and treated with laccase in the refiner blowline. The different fiber reactivities or board properties were not due to a presence of different amounts of lignin remaining on the fiber surfaces after acetone extraction. The probable reason for them was the fact that the amount of low-molecular weight lignin, a reactive substrate for laccase, increases with increasing defibration temperature. The adhesion occurring during pressing is thus likely to involve coupling or other reactions of radicals located on adjacent fibers, whereby interfiber covalent bonds are formed.

KW - boards

KW - fiberboards

KW - MDF

KW - defibration

KW - laccase

KW - heat treatment

U2 - 10.1007/s00226-003-0206-4

DO - 10.1007/s00226-003-0206-4

M3 - Article

VL - 38

SP - 521

EP - 528

JO - Wood Science and Technology

JF - Wood Science and Technology

SN - 0043-7719

IS - 7

ER -