Orthokinetic Heteroflocculation in Papermaking

Ven, van de Aaf Fons; Theo, G. M. Van de Ven

doi:10.1002/9783527623884.ch1

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…It should be stated that because of their very high molecular weight, water solubility, and negative charge, the TOL-starch copolymers could be used in other industries. For example, similar to starch, TOL-starch can be used as a retention aid, wet-end additive or surface coating in the papermaking process . Also, the copolymer can be utilized, along with a cationic polymer, in a dual system for improving the dry strength properties of paper products, especially for carton board and packaging applications where the color of end-use products is not a top priority .…”

Section: Introductionmentioning

confidence: 99%

Generation of Sulfonated Lignin-Starch Polymer and Its Use As a Flocculant

2023

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This paper reports the polymerization of tall oil lignin (TOL), starch, and 2-methyl-2-propene-1-sulfonic acid sodium salt (MPSA), a sulfonate-containing monomer, in a three-component system to generate flocculants for colloidal systems. By utilizing the advanced 1 H, COSY, HSQC, HSQC-TOCSY, and HMBC NMR techniques, it was confirmed that the phenolic substructures of TOL and the anhydroglucose unit of starch were covalently polymerized by the monomer to generate the three-block copolymer. The molecular weight, radius of gyration, and shape factor of the copolymers were fundamentally correlated to the structure of lignin and starch, as well as the polymerization outcomes. The deposition behavior of the copolymer, studied by a quartz crystal microbalance with dissipation (QCM-D) analysis, revealed that the copolymer with a larger molecular weight (ALS-5) deposited more and generated more compact adlayer than the copolymer with a smaller molecular weight on a solid surface. Owing to its higher charge density, molecular weight, and extended coil-like structure, ALS-5 produced larger flocs with faster sedimentation in the colloidal systems, regardless of the extent of agitation and gravitational force. The results of this work provide a new approach to preparing a lignin-starch polymer, i.e., a sustainable biomacromolecule with excellent flocculation performance in colloidal systems.

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Section: Introductionmentioning

confidence: 99%

Generation of Sulfonated Lignin-Starch Polymer and Its Use As a Flocculant

2023

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“…The behavior will depend on the degree of surface coverage, molecular weight, charge density, type of polymer, and degree of dissolution. For partially covered surfaces, the already adsorbed polymer on a given particle may attach to the bare surface on another one, forming a particle–particle bridge (bridging flocculation). − The bridging flocculation mechanisms have been extensively studied. − …”

Section: Introductionmentioning

confidence: 99%

Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

Gaudreault

Cesare

Ven

et al. 2015

Ind. Eng. Chem. Res.

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Because of persistent economic pressure on cost reduction, inorganic fillers such as precipitated calcium carbonate (PCC) have become increasingly economically attractive in the papermaking process. The increase of filler level in paper can be achieved by adding it to pulp prior to the headbox, either as individual filler particles or as preaggregates, while maintaining paper strength and minimizing their negative impact. Consequently, the floc structure and strength of PCC aggregates was studied using flocculants and dry strength agents, using static light scattering/diffraction (SLS), real time fluorescent video imaging (RTFVI), image analysis, photometric dispersion analysis (PDA), and scanning electron microscopy (SEM). It was found that PEO/cofactor induced PCC aggregates were weaker at high shear and far more irreversible than those induced by the partially hydrolyzed polyvinyl formamide copolymerized with acrylic acid (PVFA/NaAA) or cationic starch. Flocs produced at low polymer dosages were smaller and weaker than those produced at higher dosages. The number of discrete PCC particles in aggregates was measured using real time fluorescent video imaging combined with image analysis. Finally, we speculate that when two scalenohedral crystal type PCC particles aggregate, there is a small effective surface area to bind them, mainly through classical bridging or charge neutralization flocculation. Moreover, additional polymer adsorption results in higher coverage of the external and internal surfaces and prevents further aggregation due to electrosteric repulsion.

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“…For partially covered surfaces, the already adsorbed polymer on a given particle may attach to the bare surface on another one forming a particle-particle bridge (bridging flocculation) [42][43][44][45][46]. The bridging flocculation mechanisms were extensively studied [42][43][44][45][46][47][48][49][50][51].…”

Section: Introductionmentioning

confidence: 99%

The Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

Gaudreault,

Di Cesare,

van de Ven

et al. 2009

Trans. Of the XIVth Fund. Res. Symp. Oxford, 2009

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When the percentage of ﬁller is increased in paper, the optical properties are improved and the production cost lowered. However, ﬁllers weaken paper strength by decreasing the ﬁbre-ﬁbre bonded area. Little is known about the optimum ﬁller ﬂoc size or ﬁller ﬂoc properties to allow developing optimum paper characteristics. Consequently, the ﬂoc structure and strength of precipitated calcium carbonate (PCC) aggregates was studied using various polymers (ﬂocculants and dry strength agents): by static light scattering/diffraction (SLS), real time ﬂuorescent video imaging, image analysis, photometric dispersion analysis (PDA) and scanning electron microscopy (SEM). It was found that PEO/cofactor induced PCC aggregates were weaker at high shear and far more irreversible than those induced by the partially hydrolysed polyvinyl formamide copolymerised with acrylic acid (PVFA/NaAA) or C-starch. Flocs produced at low polymer dosages were smaller and weaker than those produced at higher dosages. The number of discrete PCC particles in aggregates was measured using real time ﬂuorescent video imaging combined with image analysis.

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Orthokinetic Heteroflocculation in Papermaking

Cited by 3 publications

References 23 publications

Generation of Sulfonated Lignin-Starch Polymer and Its Use As a Flocculant

Generation of Sulfonated Lignin-Starch Polymer and Its Use As a Flocculant

Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

The Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

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