Bulk and surface composition of ECF bleached hardwood kraft pulp fibres

Neto, Carlos Pascoal; Silvestre, Armando J. D.; Evtuguin, Dmitry; Freire, Carmen S. R.; Pinto, Paula C.A.G.; Santiago, Ana Sofia; Fardim, Pedro; Holmbom, Bjarne

doi:10.3183/npprj-2004-19-04-p513-520

Cited by 28 publications

(21 citation statements)

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“…When the sequential extraction is performed, the main contribution to the extractives content came from the methanol/water extract (5.1-13.9 5 %), in agreement with the high content of polyphenols in this wood (Pietarinen et al 2005). Lipophilic extractives were also quite abundant in these species except Keora, as shown by the weight of dichloromethane extract (0.8-2.21 %), being composed essentially of aliphatic acids and long-chain ([C20) aliphatic alcohols (Pietarinen et al 2004;Neto et al 2004). The high content of extractives may constitute a negative point of this species when used as a fiber source, because extractives increase the chemical consumption during pulping and bleaching processes and may lead to pitch deposits in mill machinery.…”

Section: Resultssupporting

confidence: 51%

Pulping and papermaking potential of six mangrove species in Bangladesh

Al-Maruf

Jahan

2015

J Indian Acad Wood Sci

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In this paper, physical, morphological and chemical characterizations of the six main mangrove species of Bangladesh [namely Keora (Sonneratia apetala), Gewa (Excoecaria agallocha), Bine (Avicennia alba), Sundari (Heritiera fomes) Pashur (Xylocarpous mekongests) and Kakra (Bruguiera gymnorhiza)] were discussed in order to assess the suitability of pulping raw materials. The wood density of these six mangrove was found to be 0.5-0.6 g cm -3 except Gewa which had 0.39 g cm -3 . The fiber length of these species was varied from 0.74 to 1.2 mm that was considered as short fiber. Sundari contributed the longest fibre length (1.2 mm) among these six species. The chemical results revealed that these species contain high percentages of dichloromethane, followed by methanol extractives. Methanol extracts in Pashur, Sundari and Bine was higher than 10 %, which indicates high percentage of tannin material. These species were characterized with high lignin content and low a-cellulose content. The pulping of these six mangrove species was also carried out by kraft process and papermaking properties were also evaluated. Pulp yield was lower and kappa number was higher as compared with other tropical hardwoods. But the physical properties of these species were quite acceptable. Considering pulp yield, kappa number and physical properties, it may be concluded that Keora and Gewa can be used as kraft liner and other packaging grade paper pulp.

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Section: Resultssupporting

confidence: 51%

Pulping and papermaking potential of six mangrove species in Bangladesh

Al-Maruf

Jahan

2015

J Indian Acad Wood Sci

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“…The absence of the quasimolecular ion [CF 3 COOCOCF 3 + H] + at m/z = 211 indicated moreover that the removal of residual unbound trifluoroacetic anhydride during the washing and extraction steps had been quite efficient. However, the absence of sporadic adsorbed amounts of trifluoroacetic acid could not be excluded, because of the presence of an ion at m/z = 115, that could be assigned to the corresponding quasimolecular ion [CF 3 COOH + H] + , but which also coincides with a fragment previously observed on the spectra of unmodified cellulose fibers [27].…”

Section: Surface Characterizationmentioning

confidence: 95%

Characterization and evaluation of the hydrolytic stability of trifluoroacetylated cellulose fibers

Cunha

Freire

Silvestre

et al. 2007

Journal of Colloid and Interface Science

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“…The fine-tuned characterization of the surface of the modified fibers constitutes therefore an essential requirement in this type of study. Among the analytical techniques available for this purpose, X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) are well suited to investigate lignocellulosic fibers [3][4][5][6][7][8][9][10] and their derivatives [11][12][13][14][15]. The sampling depths associated with XPS and ToF-SIMS are typically 3-10 nm and 0.2-1 nm, respectively.…”

Section: Introductionmentioning

confidence: 99%