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Journal articles
Open Access
Optimizing reinforcement pulps by fracture toughness, TAPPI JOURNAL, January 1996, Vol. 79(1)

Optimizing reinforcement pulps by fracture toughness, TAPPI JOURNAL, January 1996, Vol. 79(1)

Journal articles
Open Access
Xylanase- and mannanase-aided ecf and tcf bleaching, TAPPI JOURNAL, July 1996, Vol. 79(7)

Xylanase- and mannanase-aided ecf and tcf bleaching, TAPPI JOURNAL, July 1996, Vol. 79(7)

Journal articles
Open Access
Biocides-bug killers that enhance pulpmaking and papermaking processes, TAPPI JOURNAL, July 1996, Vol. 79(7)

Biocides-bug killers that enhance pulpmaking and papermaking processes, TAPPI JOURNAL, July 1996, Vol. 79(7)

Journal articles
Open Access
Combining pilot-scale ozone and activated sludge treatments on newsprint mill effluents, TAPPI JOURNAL, June 1996, Vol. 79(6)

Combining pilot-scale ozone and activated sludge treatments on newsprint mill effluents, TAPPI JOURNAL, June 1996, Vol. 79(6)

Journal articles
Open Access
Controlling trs emissions from dissolving-tank vent stacks, TAPPI JOURNAL, June 1996, Vol. 79(6)

Controlling trs emissions from dissolving-tank vent stacks, TAPPI JOURNAL, June 1996, Vol. 79(6)

Journal articles
Open Access
Experience with water system closure at recycled paperboard mills, TAPPI JOURNAL, March 1996, Vol. 79(3)

Experience with water system closure at recycled paperboard mills, TAPPI JOURNAL, March 1996, Vol. 79(3)

Journal articles
Open Access
Weighting function for the calculation of iso brightness, TAPPI JOURNAL, March 1996, Vol. 79(3)

Weighting function for the calculation of iso brightness, TAPPI JOURNAL, March 1996, Vol. 79(3)

Journal articles
Open Access
New urethane prepolymer immobilized fungal bioreactor for decolorization and dechlorination of kraft bleach effluents, TAPPI JOURNAL, May 1996, Vol. 79(5)

New urethane prepolymer immobilized fungal bioreactor for decolorization and dechlorination of kraft bleach effluents, TAPPI JOURNAL, May 1996, Vol. 79(5)

Journal articles
Open Access
The effect of pulp fiber properties on the In-plane tearing work of paper, TAPPI JOURNAL, May 1996, Vol. 79(5)

The effect of pulp fiber properties on the In-plane tearing work of paper, TAPPI JOURNAL, May 1996, Vol. 79(5)

Journal articles
Magazine articles
Open Access
Probing the molecular weights of sweetgum and pine kraft lignin fractions, TAPPI Journal June 2021

ABSTRACT: The present investigation undertook a systematic investigation of the molecular weight (MW) of kraft lignins throughout the pulping process to establish a correlation between MW and lignin recovery at different extents of the kraft pulping process. The evaluation of MW is crucial for lignin characterization and utilization, since it is known to influence the kinetics of lignin reactivity and its resultant physico-chemical properties. Sweetgum and pine lignins precipitated from black liquor at different pHs (9.5 and 2.5) and different extents of kraft pulping (30•150 min) were the subject of this effort. Gel permeation chromatography (GPC) was used to determine the number average molecular weight (Mn), mass average molecular weight (Mw), and polydispersity of the lignin samples. It was shown that the MW of lignins from both feedstocks follow gel degradation theory; that is, at the onset of the kraft pulping process low molecular weight-lignins were obtained, and as pulping progressed, the molecular weight peaked and subsequently decreased. An important finding was that acetobromination was shown to be a more effective derivatization technique for carbohydrates containing lignins than acetylation, the technique typically used for derivatization of lignin.

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