The Role of "Free Charge" in the Deposition of Latex Particles onto Pulp Fibers

Alinče, B.; J, Kinkal; Bednar, F.; Ven, Theo G. M. van de

doi:10.1021/bk-2002-0801.ch005

Cited by 7 publications

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“…This result shows clearly that the reinforcement fibril materials have strongly enhancing the modulus and strength of rubber composite materials where the rubber matrix holds the micro fibrils together (Fig. 6), while the micro fibrillated fibrils have a good bonding network (Alince et al 2001), enhancing energy absorption of fibril rubber matrix under deforming stress.…”

Section: Reinforcement Properties Of Micro-lignocellulosic Fibrils On...mentioning

confidence: 82%

Production of micro-lignocellulosic fibril rubber composites and their application in coated layers of building materials

Teangtam,

Yingprasert,

Somboon

2023

BioRes

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Novel composite materials were made by combining micro-lignocellulosic fibrils and natural rubber applied as spray coated layers for building materials. The micro-lignocellulosic fibrils were produced based on the mechanical pulping process with jute bast as the raw material. The obtained micro-lignocellulosic fibrils had a good content of water-suspended materials with fibril widths of about 0.1 to 1.0 µm and fibril length of about 100 to 150 µm. The composites were produced using natural rubber mixed with the micro-lignocellulosic fibrils at 0, 5, and 10 parts per hundred of rubber, vulcanizing sulfur, and activated zinc oxide. The fibril-rubber suspension was formed in the composite sheets with a thickness of 0.5 to 1.5 mm using a spray coating technique and was oven-dried at 100 °C. The rubber composite had a homogenous fibril distribution in the rubber composite matrix, with good bonding between the fibrils and the rubber polymers. The fibrils contributed to the strength reinforcement of the rubber composite layers. The application of the micro-lignocellulosic fibril rubber composites coated onto industrial fiber cement boards enhanced the thermal insulation properties, which had a lower degree of thermal conductivity and heat diffusivity and enhanced the toughness and waterproofing of the fiber cement boards.

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Section: Reinforcement Properties Of Micro-lignocellulosic Fibrils On...mentioning

confidence: 82%

Production of micro-lignocellulosic fibril rubber composites and their application in coated layers of building materials

Teangtam,

Yingprasert,

Somboon

2023

BioRes

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“…Shirazi et al , studied the adsorption of low charge density cationic starch onto both porous glass and pulp fibers, finding that the corresponding amylose fraction ( M w = 1.4 × 10 5 Da) could penetrate into the pores whereas the higher molecular mass amylopectin fraction ( M w = 3 × 10 8 Da) was restricted to the exterior of the surface. Alince and van de Ven suggested that the radius of the fiber pores ultimately determines if an adsorbing polyelectrolyte can pass freely into the fiber wall . Several publications ,– have also discussed polyelectrolyte adsorption in various electrolyte concentrations.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Highly Charged Polyelectrolytes onto an Oppositely Charged Porous Substrate

2008

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The adsorption behavior of highly charged cationic polyelectrolytes onto porous substrates is electrostatic in nature and has been shown to be highly dependent on the polyelectrolyte properties. Copolymers of acrylamide (AM) and diallyldimethylammonium chloride (DADMAC) were synthesized to have a range of macromolecular properties (i.e., charge density and molecular mass). Traditional titration methods have been complemented by fluorescence labeling techniques that were developed to directly observe the extent that fluorescently labeled poly(AM- co-DADMAC) adsorbs into the pore structure of a cellulosic substrate. Although contributing to the electrostatic driving force, the charge density acts to limit adsorption to the outermost surface under electrolyte-free conditions. However, adsorption into the pores can occur if both the molecular mass and charge density of poly(AM- co-DADMAC) are sufficiently low. Adsorption initially increases as the electrolyte concentration is increased. However, the electrostatic persistence length of poly(AM- co-DADMAC) restricts the polyelectrolyte from entering the pores. Therefore, changes in the adsorption behavior at moderate electrolyte concentrations have been attributed to swelling of the polyelectrolyte layer at the fiber exterior. The adsorption behavior changes again at high electrolyte concentrations such that poly(AM- co-DADMAC) could adsorb into the pore structure. This occurred when the electrolyte concentration was sufficient to screen the electrostatic persistence length of poly(AM- co-DADMAC), provided that the entropic driving force for adsorption still existed. It is suggested that adsorption into the pore structure is a kinetic process that is governed by localized electrostatic interactions between poly(AM- co-DADMAC) and the charges located within the pores.

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Orthokinetic Heteroflocculation in Papermaking

Ven

Theo²

2008

Highlights in Colloid Science

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The Role of "Free Charge" in the Deposition of Latex Particles onto Pulp Fibers

Cited by 7 publications

References 0 publications

Production of micro-lignocellulosic fibril rubber composites and their application in coated layers of building materials

Production of micro-lignocellulosic fibril rubber composites and their application in coated layers of building materials

Adsorption of Highly Charged Polyelectrolytes onto an Oppositely Charged Porous Substrate

Orthokinetic Heteroflocculation in Papermaking

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