Inverse gas chromatography and XPS of extracted kraft pulps

Gamelas, José A. F.; Duarte, Gustavo V.; Ferreira, Paulo J.

doi:10.1515/hf-2012-0126

Cited by 4 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the changes in the surface properties determined by IGC, NaIO 4 was found to be a weaker oxidizing agent. The value of the

parameter measured for kraft lignin (35.2 mJ/m 2 ) is in agreement with the values reported in the literature [ 62 ]: from 30 to 39 mJ/m 2 at 40 °C depending on the kraft pulp. Belgacem et al reported slightly higher values of

for kraft lignin (46 mJ/m 2 ) but that material came from a different source than that used in the present study [ 63 ].…”

Section: Resultssupporting

confidence: 91%

Activation of Magnesium Lignosulfonate and Kraft Lignin: Influence on the Properties of Phenolic Resin-Based Composites for Potential Applications in Abrasive Materials

Kłapiszewski

Jamrozik

Strzemięcka

et al. 2017

IJMS

View full text Add to dashboard Cite

Magnesium lignosulfonate and kraft lignin were activated by different oxidizing agents for use in phenolic resin composites used for the production of abrasive components. The physicochemical properties of the oxidized materials were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), dynamic mechanical-thermal analysis (DMTA) and inverse gas chromatography (IGC). The homogeneity of the model abrasive composites containing the studied products was assessed based on observations obtained using a scanning electron microscope (SEM). FTIR and XPS analysis of the oxidized products indicated that the activation process leads mainly to the formation of carbonyl groups. The IGC technique was used to assess changes in the surface energy and the acid–base properties of the studied biopolymers. The changes in the acid–base properties suggest that more groups acting as electron donors appear on the oxidized surface of the materials. DMTA studies showed that the model composites with 5% magnesium lignosulfonate oxidized by H2O2 had the best thermomechanical properties. Based on the results it was possible to propose a hypothetical mechanism of the oxidation of the natural polymers. The use of such oxidized products may improve the thermomechanical properties of abrasive articles.

show abstract

“…Considering the changes in the surface properties determined by IGC, NaIO 4 was found to be a weaker oxidizing agent. The value of the

for kraft lignin (46 mJ/m 2 ) but that material came from a different source than that used in the present study [ 63 ].…”

Section: Resultssupporting

confidence: 91%

Activation of Magnesium Lignosulfonate and Kraft Lignin: Influence on the Properties of Phenolic Resin-Based Composites for Potential Applications in Abrasive Materials

Kłapiszewski

Jamrozik

Strzemięcka

et al. 2017

IJMS

View full text Add to dashboard Cite

show abstract

“…The effect of preliminary hot water extraction on the surface properties of eucalypt and sugar maple (Acer Saccharum) kraft pulps was also considered: kraft pulps with kappa number of 15 obtained from Acer saccharum and Eucalyptus globulus prepared with and without hot water extraction (HWE) before cooking were analysed by IGC and XPS (Duarte et al 2012;Gamelas et al 2013). It should be noted that HWE is used to extract hemicelluloses from the material (the xylan amount is reduced from about 16 % in the reference pulp to ca.…”

Section: Cellulose Analyses By Igcmentioning

confidence: 99%

“…Cellulose and lignocellulosic materials belong to a class of materials that has been thoroughly studied using IGC, because of the importance of their physicochemical surface properties in the context of papermaking, textile area and, particularly, in the production of composites with polymeric matrices (Felix et al 1993;Chtourou et al 1997;Gauthier et al 1998a;Matuana et al 1998;Gulati and Sain 2006a;Gulati and Sain 2006b;Tze et al 2006a, b;Dominkovics et al 2007;Wang and Sain 2007;Gregorova et al 2009;Rocha et al 2009;Tonoli et al 2010;Gamelas et al 2012Gamelas et al , 2013. The purpose of this article is to critically review and discuss the most relevant results available in the literature about the use of IGC to characterize the surface of cellulosics.…”

Section: Introductionmentioning

confidence: 99%

The surface properties of cellulose and lignocellulosic materials assessed by inverse gas chromatography: a review

Gamelas

2013

Cellulose

View full text Add to dashboard Cite

The physicochemical surface properties of cellulose and lignocellulosic materials are of major importance in the context of the production of composites, in papermaking, and textile area. These properties can be evaluated by using inverse gas chromatography (IGC), a particularly suitable technique for the characterization of the surface properties of fibrous materials and powders. At infinite dilution conditions of appropriate gas probes, IGC may provide important parameters including the dispersive component of the surface energy of the material under analysis, thermodynamic data on the adsorption of specific probes, and Lewis acid-base interaction parameters between the matrix and the filler of composite materials. This paper critically reviews the most relevant results available in the literature concerning the characterization of cellulose and lignocellulosic materials using IGC. Emphasis will be put into the cellulose and nanocellulose surface properties, changes in the surface properties of cellulose and lignocellulosic materials after chemical and physical modifications, and in the compatibility of cellulose-based materials with polymeric matrices. The surface properties of non-woody fibers will also be considered. Before discussing the results available in the literature, the theoretical background and the main approaches used for the calculation of parameters accessed by IGC will be given. It is expected that this review can contribute to a better knowledge of the physicochemical surface properties of cellulosics.

show abstract

“…Furthermore, the lowest median value of γ sp of F1-PCL among all lignin -g- PCLs (Table ) means the strongest polar–polar affinity . Additionally, a higher hydrophilicity index, defined as the ratio of γ sp /(γ sp + γ d ), of KL-PCL than that of KL but lower than that of PCL (Table ) indicates that lignin incorporation can intensify the hydrophobicity of PCL, which might be because lignin introduced aromatic groups to long-chain PCL esters. , The lowest hydrophilicity index of F1-PCL (Table ) may be ascribed to the highest content of hydrophobic groups like ester and alkyl groups because of the longest PCL chains. However, although F2-PCL has a longer PCL chain length (more ester and alkyl groups) than F3-PCL, it still exhibits a higher hydrophilicity index (0.24 vs 0.19).…”

Section: Resultsmentioning

confidence: 99%

Effect of the Lignin Structure on the Physicochemical Properties of Lignin-Grafted-Poly(ε-caprolactone) and Its Application for Water/Oil Separation

Xie

Meng

et al. 2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Lignin-grafted poly(ε-caprolactone) copolymers (lignin-g-PCLs) have shown wide application potentials in coatings, biocomposites, and biomedical fields. However, the structural heterogeneity of lignin affecting the structures and properties of lignin-g-PCL has been scarcely investigated. Herein, kraft lignin is fractionated into four precursors, namely, Fins, F1, F2, and F3, with declining molecular weights and increased hydroxyl contents. Lignin-g-PCLs are synthesized via ring-opening polymerization of ε-caprolactone with lignin and characterized by GPC, FTIR, 1H and 31P NMR, DSC, TGA, and iGC. The mechanical properties, UV barrier, and enzymatic biodegradability of the lignin-g-PCLs are evaluated. Results show that lignin with a higher molecular weight and aliphatic OH favors the copolymerization, leading to lignin-g-PCLs with longer PCL arms. Moreover, lignin incorporation improves the thermal stability, hydrophobicity, and UV-blocking ability but reduces the lipase hydrolyzability of the copolymers. We also demonstrated that the lignin-g-PCL-coated filter paper could successfully separate chloroform–, petroleum ether–, and hexane–water mixtures with an efficiency up to 99.2%. The separation efficiency remains above 90% even after 15 cycles. The structural differences of copolymers derived from the fractionation showed minimal influence on the separation efficiency. This work provides new insights into lignin-based copolymerization and the versatility of lignin valorization.

show abstract

Inverse gas chromatography and XPS of extracted kraft pulps

Abstract: Aguarda recepção da versão digital do autor ou a digitalização da versão impressa.

Cited by 4 publications

References 12 publications

Activation of Magnesium Lignosulfonate and Kraft Lignin: Influence on the Properties of Phenolic Resin-Based Composites for Potential Applications in Abrasive Materials

Activation of Magnesium Lignosulfonate and Kraft Lignin: Influence on the Properties of Phenolic Resin-Based Composites for Potential Applications in Abrasive Materials

The surface properties of cellulose and lignocellulosic materials assessed by inverse gas chromatography: a review

Effect of the Lignin Structure on the Physicochemical Properties of Lignin-Grafted-Poly(ε-caprolactone) and Its Application for Water/Oil Separation

Contact Info

Product

Resources

About