Impact of molecular weight of kraft lignin on adhesive performance of lignin-based phenol-formaldehyde resins

Pia Solt, Anna Stiina Jääskeläinen, Peter Lingenfelter, Johannes Konnerth, Hendrikus W.G. Van Herwijnen

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

This study describes the influence of improved lignin homogeneity on the adhesive properties of lignin-based phenolic resins. Softwood kraft lignin was separated by applying an ethanol-based solvent fractionation to obtain three lignin fractions with a narrow molar mass distribution (smallest [Mw 1,590 g/mol] to largest [9,570 g/mol]). Lignin-phenol-formaldehyde (LPF) adhesives were prepared by 50 percent (by weight) substitution of phenol with an adjusted formaldehyde-to-phenol molar ratio. For investigating the storage stability of the resin, viscosity was monitored, curing behavior was determined by differential scanning calorimetry (DSC), and development of the bonding strength was analyzed via tensile shear strength as a function of press time. An acceleration of the condensation process for LPFs with higher molecular mass was observed. DSC signal indicated that LPFs need a slightly higher temperature for a complete curing than the phenol-formaldehyde reference resin. Furthermore, it was found that the tensile shear strength decreases with the use of fractionated kraft lignin in phenolic adhesives. No significant difference in reactivity was found for the resins making up the different lignin fractions.

Original languageEnglish
Pages (from-to)365-371
Number of pages7
JournalForest Products Journal
Volume68
Issue number4
DOIs
Publication statusPublished - 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

Lignin
formaldehyde
Formaldehyde
adhesives
phenol
lignin
Phenols
resins
resin
Adhesives
Resins
Molecular weight
molecular weight
Phenol
Shear strength
Curing
curing (nonfood products)
Differential scanning calorimetry
calorimetry
shear strength

Cite this

Solt, P., Jääskeläinen, A. S., Lingenfelter, P., Konnerth, J., & Van Herwijnen, H. W. G. (2019). Impact of molecular weight of kraft lignin on adhesive performance of lignin-based phenol-formaldehyde resins. Forest Products Journal, 68(4), 365-371. https://doi.org/10.13073/FPJ-D-17-00079
Solt, Pia ; Jääskeläinen, Anna Stiina ; Lingenfelter, Peter ; Konnerth, Johannes ; Van Herwijnen, Hendrikus W.G. / Impact of molecular weight of kraft lignin on adhesive performance of lignin-based phenol-formaldehyde resins. In: Forest Products Journal. 2019 ; Vol. 68, No. 4. pp. 365-371.
@article{864bd3b7a85b4573bb365f3e21214e08,
title = "Impact of molecular weight of kraft lignin on adhesive performance of lignin-based phenol-formaldehyde resins",
abstract = "This study describes the influence of improved lignin homogeneity on the adhesive properties of lignin-based phenolic resins. Softwood kraft lignin was separated by applying an ethanol-based solvent fractionation to obtain three lignin fractions with a narrow molar mass distribution (smallest [Mw 1,590 g/mol] to largest [9,570 g/mol]). Lignin-phenol-formaldehyde (LPF) adhesives were prepared by 50 percent (by weight) substitution of phenol with an adjusted formaldehyde-to-phenol molar ratio. For investigating the storage stability of the resin, viscosity was monitored, curing behavior was determined by differential scanning calorimetry (DSC), and development of the bonding strength was analyzed via tensile shear strength as a function of press time. An acceleration of the condensation process for LPFs with higher molecular mass was observed. DSC signal indicated that LPFs need a slightly higher temperature for a complete curing than the phenol-formaldehyde reference resin. Furthermore, it was found that the tensile shear strength decreases with the use of fractionated kraft lignin in phenolic adhesives. No significant difference in reactivity was found for the resins making up the different lignin fractions.",
author = "Pia Solt and J{\"a}{\"a}skel{\"a}inen, {Anna Stiina} and Peter Lingenfelter and Johannes Konnerth and {Van Herwijnen}, {Hendrikus W.G.}",
year = "2019",
doi = "10.13073/FPJ-D-17-00079",
language = "English",
volume = "68",
pages = "365--371",
journal = "Forest Products Journal",
issn = "0015-7473",
publisher = "Forest Products Society",
number = "4",

}

Solt, P, Jääskeläinen, AS, Lingenfelter, P, Konnerth, J & Van Herwijnen, HWG 2019, 'Impact of molecular weight of kraft lignin on adhesive performance of lignin-based phenol-formaldehyde resins', Forest Products Journal, vol. 68, no. 4, pp. 365-371. https://doi.org/10.13073/FPJ-D-17-00079

Impact of molecular weight of kraft lignin on adhesive performance of lignin-based phenol-formaldehyde resins. / Solt, Pia; Jääskeläinen, Anna Stiina; Lingenfelter, Peter; Konnerth, Johannes; Van Herwijnen, Hendrikus W.G.

In: Forest Products Journal, Vol. 68, No. 4, 2019, p. 365-371.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Impact of molecular weight of kraft lignin on adhesive performance of lignin-based phenol-formaldehyde resins

AU - Solt, Pia

AU - Jääskeläinen, Anna Stiina

AU - Lingenfelter, Peter

AU - Konnerth, Johannes

AU - Van Herwijnen, Hendrikus W.G.

PY - 2019

Y1 - 2019

N2 - This study describes the influence of improved lignin homogeneity on the adhesive properties of lignin-based phenolic resins. Softwood kraft lignin was separated by applying an ethanol-based solvent fractionation to obtain three lignin fractions with a narrow molar mass distribution (smallest [Mw 1,590 g/mol] to largest [9,570 g/mol]). Lignin-phenol-formaldehyde (LPF) adhesives were prepared by 50 percent (by weight) substitution of phenol with an adjusted formaldehyde-to-phenol molar ratio. For investigating the storage stability of the resin, viscosity was monitored, curing behavior was determined by differential scanning calorimetry (DSC), and development of the bonding strength was analyzed via tensile shear strength as a function of press time. An acceleration of the condensation process for LPFs with higher molecular mass was observed. DSC signal indicated that LPFs need a slightly higher temperature for a complete curing than the phenol-formaldehyde reference resin. Furthermore, it was found that the tensile shear strength decreases with the use of fractionated kraft lignin in phenolic adhesives. No significant difference in reactivity was found for the resins making up the different lignin fractions.

AB - This study describes the influence of improved lignin homogeneity on the adhesive properties of lignin-based phenolic resins. Softwood kraft lignin was separated by applying an ethanol-based solvent fractionation to obtain three lignin fractions with a narrow molar mass distribution (smallest [Mw 1,590 g/mol] to largest [9,570 g/mol]). Lignin-phenol-formaldehyde (LPF) adhesives were prepared by 50 percent (by weight) substitution of phenol with an adjusted formaldehyde-to-phenol molar ratio. For investigating the storage stability of the resin, viscosity was monitored, curing behavior was determined by differential scanning calorimetry (DSC), and development of the bonding strength was analyzed via tensile shear strength as a function of press time. An acceleration of the condensation process for LPFs with higher molecular mass was observed. DSC signal indicated that LPFs need a slightly higher temperature for a complete curing than the phenol-formaldehyde reference resin. Furthermore, it was found that the tensile shear strength decreases with the use of fractionated kraft lignin in phenolic adhesives. No significant difference in reactivity was found for the resins making up the different lignin fractions.

UR - http://www.scopus.com/inward/record.url?scp=85067969863&partnerID=8YFLogxK

U2 - 10.13073/FPJ-D-17-00079

DO - 10.13073/FPJ-D-17-00079

M3 - Article

VL - 68

SP - 365

EP - 371

JO - Forest Products Journal

JF - Forest Products Journal

SN - 0015-7473

IS - 4

ER -