The Reaction of Formaldehyde with Spruce Lignins

Sastry, G. P.

doi:10.1515/hfsg.1969.23.1.15

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…Moreover, it is well known that cellulosic fibres undergo intermolecular cross-linking with UF pre-polymers (Andrews, Reinhard, Frick and Bertoniere 1985). Furthermore, in acidic medium, formaldehyde can also react with lignin (Sastry 1969), leading to the formation of methylolated lignin, which can unfold bonding properties. Insofar, the influence of UF resin on lignocellulosic fibres is an intricate issue, in which many aforementioned factors are intertwined.…”

Section: Resultsmentioning

confidence: 99%

“…1 Thickness swelling (24 h) of MDF made from 100% TMP and a mixture of 33% recycled fibres (Rec Fibres) and 67% TMP 2 Water absorption (2 and 24 h) of MDF made from 100% TMP and a mixture of 33% recycled fibres (Rec Fibres) and 67% TMP Furthermore, in acidic medium, formaldehyde can also react with lignin (Sastry 1969), leading to the formation of methylolated lignin, which can unfold bonding properties. Insofar, the influence of UF resin on lignocellulosic fibres is an intricate issue, in which many aforementioned factors are intertwined.…”

Section: Thickness Swelling and Water Absorptionmentioning

confidence: 99%

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Bonding of recycled fibres with urea-formaldehyde resins

Roffael

Behn

Schneider

et al. 2016

International Wood Products Journal

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The work aimed to study the influence of replacing virgin wood fibres by recycled fibres, made from recovered medium-density fibreboards (MDF) by thermo-mechanical pulping, on the physical-mechanical properties and formaldehyde release of urea-formaldehyde (UF)-bonded MDF. It was found that replacement of 33% virgin fibres by recycled fibres decreased significantly the thickness swelling and water absorption of the UF-bonded MDF and mitigated the formaldehyde release. However, supplanting 33% of virgin fibres by recycled fibres had a negative impact on the internal bond strength. UF-bonded MDF with higher amounts of recycled fibres (67 and 100%) could not be produced without applying the hybrid bonding technology, i.e. adding small quantities of polymeric diphenylmethane diisocyanate to the UF resin. MDF made from 100% recycled fibres showed significantly lower thickness swelling values as well as a drastic drop in the formaldehyde release compared with boards made from virgin wood fibres.

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Section: Resultsmentioning

confidence: 99%

Section: Thickness Swelling and Water Absorptionmentioning

confidence: 99%

Bonding of recycled fibres with urea-formaldehyde resins

Roffael

Behn

Schneider

et al. 2016

International Wood Products Journal

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Effects of formaldehyde-acid catalyzed reactions on wood ultrastructure

Stevens

Parameswaran

1981

Wood Sci.Technol.

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Abbau von UF-Harzen beim TMP- und CTMP-Aufschluss von mitteldichten Faserplatten (MDF)

Roffael

Dix²,

Behn

et al. 2008

Eur. J. Wood Prod.

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Thermo-mechanical (TMP) and chemo-thermo-mechanical pulping (CTMP) of UF-bonded MDF induce considerable degradation of the UF-resin in the board and lead to a conspicuous increase in the content of water extractives of the fibres. Moreover, the water extractives of the fibres have a higher pH-value and a lower buffering capacity as well as higher acetate and formate ions content than the extractives of the original board. However, the lignin content seems rather to increase than to decrease. This is possibly due to reaction between lignin and formaldehyde from the resin

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The Reaction of Formaldehyde with Spruce Lignins

Cited by 5 publications

References 8 publications

Bonding of recycled fibres with urea-formaldehyde resins

Bonding of recycled fibres with urea-formaldehyde resins

Effects of formaldehyde-acid catalyzed reactions on wood ultrastructure

Abbau von UF-Harzen beim TMP- und CTMP-Aufschluss von mitteldichten Faserplatten (MDF)

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