Characterization of Eucalyptus heartwood and sapwood pulp after kraft cooking

Puntambekar, Rohit; Pydimalla, Madhuri; Dinda, Srikanta; Adusumalli, Ramesh Babu

doi:10.1007/s13196-016-0159-5

Cited by 8 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Eucalyptus spectrum did not present the band at 2360 cm -1 , differently from sisal and pine spectra. This absorption peak can be assigned to the lignin structure, indicating that eucalyptus pulp obtained greater delignification when compared to the other materials (Puntambekar et al, 2016).…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 92%

Blended paper: physical, optical, structural, and interfiber bonding analysis

Pego¹,

Bianchi²

2021

CERNE

View full text Add to dashboard Cite

Background: Blended paper can present suitable mechanical properties due to sirnergetic effect. However, regarded to physical properties, few studies are conducted. This study aimed to evaluate optical, structural, interfiber bonding, and other physical properties from blended paper and try to understand how these properties can affect applications. The eucalyptus, sisal, and pine pulp were used for handsheet forming. Pulps were disintegrated, refined, and blended two by two in 5/95%, 25/75%, and 45/55% ratios. Also, virgin pulps (100% of each pulp) were used for handsheet forming. Handsheets were formed and evaluated by bond strength, cobb test, air permeance, roughness, optical, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM).Results: Treatments differed statistically in bond strength, cobb test, optical, air permeance, and roughness. Generally, treatments with eucalyptus presented higher bond strength, brightness, and air permeance. Treatments with sisal presented the highest opacity and roughness. Spectra of virgin handsheets presented differences in 2170-2000 and 2360 cm -¹ bands, probably related to residual lignin content. SEM images revealed structural differences between blended and virgin pulps. Conclusion:Treatment T15 (45S 55P) presented the best results, suggesting better physical-mechanical properties. Blended handsheets presented better properties than virgin handsheets on most properties, evidencing a synergetic effect.

show abstract

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 92%

Blended paper: physical, optical, structural, and interfiber bonding analysis

Pego¹,

Bianchi²

2021

CERNE

View full text Add to dashboard Cite

show abstract

“…(Lourenço et al 2010), Populus deltoides(Gao et al 2011a), and Eucalyptus citriodora(Puntambekar et al 2016), Quercus faginea(Miranda et al 2017) had higher klason lignin than those of heartwood.In the all sampled species, heartwood samples had higher solubility values such as 1% NaOH, ethanol, hot water and cold water solubility. Previous researchers found that heartwood of Eucalyptus urograndis(Gominho et al 2001), Quercus oleoides(Hernández and Salazar, 2005), Acacia melanoxylon(Lourenço et al 2008), Eucalyptus globulus (Miranda et al 2007; Lourenço et al 2010; Morais and Pereira, 2012), Populus deltoides (Gao et al 2011a),…”

mentioning

confidence: 99%

Fiber Morphology and Chemical Composition of Heartwood and Sapwood of Red Gum, Black Willow, and Oriental Beech

Gülsoy

Aksoy

Türkmen

et al. 2021

Bartın Orman Fakültesi Dergisi

View full text Add to dashboard Cite

In this study, the differences in terms of the fiber morphology and the chemical composition between the heartwood and sapwood of red gum (Eucalyptus camaldulensis Dehnh.), black willow (Salix nigra Marsh.), and oriental beech (Fagus orientalis Lipsky) were investigated. The results showed that the heartwood samples had shorter fibers and lower slenderness ratios than those of the sapwood samples. The differences in the vessel element length of the heartwood and sapwood of sampled tree species were statistically insignificant. The heartwood samples had less holocellulose and more klason lignin content. In addition, the ethanol, hot water, and cold water solubility values in heartwood samples were higher. The other morphological and chemical properties of the heartwood and sapwood depended on the tree species.

show abstract