Analysis of CMC attachment onto cellulosic fibers by infrared spectroscopy

Gilli, Eduard; Horvath, Andrew T.; Hirn, Ulrich; Schennach, Robert

doi:10.1007/s10570-009-9289-x

Cited by 16 publications

(9 citation statements)

References 18 publications

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“…In Ref. , it was suggested to set the incidence angle to the Brewster angle of the material to get the best signal‐to‐noise ratio. However, this value is not known for C 8 O‐BTBT‐OC 8 .…”

Section: Methodssupporting

confidence: 91%

Substrate‐Induced Phase of a Benzothiophene Derivative Detected by Mid‐Infrared and Lattice Phonon Raman Spectroscopy

et al. 2018

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The presence of a substrate-induced polymorph of 2,7-dioctyloxy[1]benzothieno[3,2-b]benzothiophene is probed in microscopic crystals and in thin films. Two experimental techniques are used: lattice phonon Raman and IR spectroscopy. The bulk crystal and substrate-induced phase have an entirely different molecular packing, and therefore, their Raman spectra are characteristic fingerprints of the respective polymorphs. These spectra can be unambiguously assigned to the individual polymorphs. Drop-cast and spin-coated thin films on solid substrates are investigated in the as-prepared state and after solvent-vapor annealing. Because Raman spectroscopy is less sensitive with decreasing film thickness, IR spectroscopy is shown to be a more feasible tool for phase detection. The surface-induced phase is mainly present in the as-prepared thin films, whereas the bulk phase is present after solvent-vapor annealing. This result suggests that the surface-induced phase is a metastable polymorph.

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Section: Methodssupporting

confidence: 91%

Substrate‐Induced Phase of a Benzothiophene Derivative Detected by Mid‐Infrared and Lattice Phonon Raman Spectroscopy

et al. 2018

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“…The interfacial/adsorption aspects of CMC are mainly associated with freely available hydroxyl groups, present on each unit of the CMC structure . The adsorption of cellulose derivative onto various solid surfaces/mineral surfaces has been reported, such as on graphite, pure high-quality graphite ceylon, , and mineral solid surfaces. − The results tried to establish that the adsorption of CMC at solid–liquid interfaces occurs via electrostatic, hydrophobic, hydrogen bonding, and chemical interactions; − chemical complexation, hydrophobic–hydrophobic interaction, electrostatic interaction, and hydrophobic–hydrophilic or hydrophobic self-assembled monolayers. − Other interaction behaviors of CMC on cellulose fibers or spin-coated regenerated cellulose model films from trimethylsilyl cellulose by applying a quartz crystal and various model films were also reported. − …”

Section: Introductionmentioning

confidence: 99%

Interpretation of Adsorption Behavior of Carboxymethyl Cellulose onto Functionalized Accurel Polymeric Surface

Singh

Kumar

Pandey

et al. 2020

Ind. Eng. Chem. Res.

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Carboxymethyl cellulose (CMC) is the most versatile cellulose derivative having several industrial applications such as mineral processing, pelletization process, oil drilling, surface modifications, functionalization of materials, and other promising utilizations. However, the less interpretation of the adsorption behavior of CMC onto the functionalized polymeric surface in its aqueous medium hinders its applications. The present contribution has, therefore, been made to explore the binding aspects of CMC onto functionalized accurel (FA) derived from polypropylene-based Accurel (MP1001). The physiochemical parameters of FA such as specific surface area (S BET ) = 34.472 m 2 /g, pore volume (V p ) = 0.07−0.121 cm 3 /g, total pore volume (V tp ) = 0.115 cm 3 /g, mean pore diameter = 13.692 nm, and pore diameter = 39.402 nm were determined by the Brunauer−Emmett−Teller (BET) analysis. The batch shaking adsorption experiments with various parameters were conducted, and the equilibrium isotherm data were fitted with the Freundlich, Langmuir, Temkin, and Jovanovic models of adsorption and compared by determination coefficient (R 2 ), which followed the order: Langmuir (R 2 = 0.9933) > Freundlich (R 2 = 0.9830) > Jovanovic (R 2 = 0.9428) > Temkin (R 2 = 0.8663). The infrared and X-ray photoelectron spectral changes before and after adsorption were recorded, which confirmed the hydrogen bonding between the carbonyl group of CMC and functional groups (−OH) of FA in the regions 288−280 eV and 1772−1676 cm −1 , respectively. To understand the type, nature, and strength of interaction(s) involved in the adsorbent−adsorbate complex (FA−CMC), a theoretical model is adopted in this report. With the deployment of the density functional theory (DFT) dispersion-corrected (DFT-D) and DFT approaches, geometric stability and electronic feature analyses have been performed using the optimized structure, binding/interaction energy, highest unoccupied molecular orbital−lowest unoccupied molecular orbital (HOMO−LUMO) gap, natural population analyses, and Bader's quantum theory of atoms in molecules (QTAIM)-based parameters. The reactive sites of the aforementioned species have been detected using the molecular electrostatic potential surface (MESP) map. The exhibition of different geometrical and electronic features including the binding aspects of the adsorbate CMC onto the polymeric surface of the adsorbent FA was exercised via CMC accumulation stabilized by Hbonding and other weak noncovalent interactions and since such alteration could play a noteworthy role in the fields of food, pharmaceutical, and industrial chemistry.

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“…They were acetone extracted from the produced unbleached softwood (mixture of spruce and pine) Kraft pulp after the last pulp washing step according to ISO 14453 (ISO standards are described in the Supporting Information). The direct measurement of the CPE compounds adsorbed to the fibers by ATR-IR spectroscopy is difficult for small quantities . A more simple method to analyze pitch components is 2D thin-layer chromatography (TLC) .…”

Section: Methodsmentioning

confidence: 99%

How Different Carryover Pitch Extractive Components are Affecting Kraft Paper Strength

et al. 2021

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We present how harmful different wood extractives carried over to paper mill with unbleached softwood Kraft pulp are for the strength of packaging papers and boards. The investigations were done by simulating industrial papermaking conditions in laboratory-scale trials for handsheet production. It was found that fatty acids are the most relevant compounds in the carryover pitch extractives (CPEs), as they readily interfere in fiber–fiber bonding strength, control the properties of CPE micelles, and are furthermore the most abundant compounds. Addition of cationic starch improved strength and evened out the strength differences of handsheets with different CPE compounds. Oleic acid (unsaturated fatty acid) was an exception, as it was above average harmful for paper strength without cationic starch and also heavily impaired the functioning of cationic starch. As a whole, these findings demonstrate that fatty acids, especially unsaturated ones, are the most relevant CPE compounds contributing to the reduced efficiency of cationic starch and decreased strength of unbleached softwood Kraft paper. This makes the cleaning of process waters by precipitating CPEs on the pulp fibers harmful for paper strength.

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Analysis of CMC attachment onto cellulosic fibers by infrared spectroscopy

Cited by 16 publications

References 18 publications

Substrate‐Induced Phase of a Benzothiophene Derivative Detected by Mid‐Infrared and Lattice Phonon Raman Spectroscopy

Substrate‐Induced Phase of a Benzothiophene Derivative Detected by Mid‐Infrared and Lattice Phonon Raman Spectroscopy

Interpretation of Adsorption Behavior of Carboxymethyl Cellulose onto Functionalized Accurel Polymeric Surface

How Different Carryover Pitch Extractive Components are Affecting Kraft Paper Strength

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