The Effect of Fluid Properties on the Hydrodynamic Permeability Coefficient

Rodionova, I. A.; Школьников, Е. И.; Volkov, V. V.

doi:10.1007/s10595-005-0120-6

Cited by 4 publications

(4 citation statements)

References 16 publications

(22 reference statements)

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“…As it was shown in [46], stability of the adsorption layer on the interphase monomer droplet-water is additionally increased if the forming polymer is incompatible with the surface-active oligomers (organosilicon macromers of various structures)-is shown. Incompatibility of organosilicon oligomers of different structures with polystyrene and poly(methyl methacrylate) was shown experimentally in [54].…”

Section: Colloidal Characteristics Of Organosilicon Surface-active Po...mentioning

confidence: 80%

“…− The ability to reduce surface tension to a value of 20 mN/m compared to 30 mN/m for typical hydrocarbon surfactants, which is associated with structural features of the siloxane chain; − Exhibit surface-active properties, both in aqueous and non-aqueous media; − The ability to form helical structures with outwardly oriented alkyl groups due to the high flexibility of the siloxane chain and the tendency of weak Si-O dipoles to intramolecular compensation [46].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Molecular Architecture of Surface-Active Organosilicon Macromers on Their Colloidal Properties in Relation to Heterophasic Radical Polymerization of Styrene and Methyl Methacrylate

Gostenin,

Shulgin,

Shikhovtseva

et al. 2024

Physchem

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The effects of the molecular architecture of water-insoluble organosilicon polymerizable surfactant macromers (SAMs) on their colloidal-chemical characteristics and on their efficiency in heterophase radical polymerization of styrene and methyl methacrylate were studied. It was shown that despite considerable differences in the structure of three synthesized oligomers (linear α,ω-dipropylmethacrylatepolydimethylsiloxane with a number of repeated siloxane units n = 20—l-SAM; branched γ-methacryloxypropyl containing dimethylsiloxane oligomer—b-SAM; and “spherical” oligo-(γ-methacryloxypropyl)silsesquioxane—s-SAM), the colloidal-chemical characteristics (interfacial tension, layer thickness, adsorption, etc.) were rather similar. In particular, they all form “thick” multimolecular adsorption layers on the toluene–water interphase. All three SAMs were shown to act as effective colloidal stabilizers in heterophase radical polymerization of styrene and methyl methacrylate, which resulted in one-step preparation of large (0.5–1.5 µm) polymer particles with narrow particle size distribution. The obtained results are consistent with the published data on the use of water-insoluble polymerizable oligomers of various chemical structures on the heterophase radical polymerization. The use of these colloidal stabilizers may be considered as an effective way to obtain stable suspensions with large particles and narrow particle size distribution.

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Section: Colloidal Characteristics Of Organosilicon Surface-active Po...mentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Effect of Molecular Architecture of Surface-Active Organosilicon Macromers on Their Colloidal Properties in Relation to Heterophasic Radical Polymerization of Styrene and Methyl Methacrylate

Gostenin,

Shulgin,

Shikhovtseva

et al. 2024

Physchem

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“…18,19 Results and Discussion Swelling kinetics. Gel nonporous styrene-divinylbenzene copolymers are single phase materials.…”

Section: Methodsmentioning

confidence: 99%

“…The automated moni toring of the weight of swollen polymers in the course of solvent evaporation provides the basis for dynamic de sorption porometry. 18, 19 We applied this method to stud ies of hypercrosslinked polystyrene CPS 100 (Fig. 12) swollen in different solvents.…”

Section: Deformation Of Polymers During Solvent Desorptionmentioning

confidence: 99%

Deformation of styrene—divinylbenzene copolymers and hypercrosslinked polystyrenes during solvent adsorption and desorption

et al. 2007

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An automated procedure was developed for monitoring fast changes in the size of spherical samples of polymers during their contact with a solvent or drying. The kinetics of bulk defor mation in these processes was studied for a series of cross linked polymers, viz., gel type and porous styrene-divinylbenzene copolymers and poly(divinylbenzenes), and hypercrosslinked polystyrenes. Gel, macroporous, and hypercrosslinked polystyrenes are substantially different in the rate, mechanism, and degree of swelling, which is associated with the principal differ ences in their physical structures. An unusual effect of a sharp decrease followed by a tempo rary increase in the volume of porous polystyrene and poly(divinylbenzene) materials were observed during desorption (evaporation) of organic solvents. Water desorption is accompanied by an excessive bulk compression of porous granules giving rise to negative deformations, which gradually relax to the state equilibrium for the dry polymer. The results of dynamic desorption porometry (for water desorption) are indicative of a bimodal size distribution of micropores in hypercrosslinked polystyrene.

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Modelling hydraulic conductivity for porous building materials based on a prediction of capillary conductivity at capillary saturation

Knarud

Kvande

Geving

2022

International Journal of Heat and Mass Transfer

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The Effect of Fluid Properties on the Hydrodynamic Permeability Coefficient

Cited by 4 publications

References 16 publications

Effect of Molecular Architecture of Surface-Active Organosilicon Macromers on Their Colloidal Properties in Relation to Heterophasic Radical Polymerization of Styrene and Methyl Methacrylate

Effect of Molecular Architecture of Surface-Active Organosilicon Macromers on Their Colloidal Properties in Relation to Heterophasic Radical Polymerization of Styrene and Methyl Methacrylate

Deformation of styrene—divinylbenzene copolymers and hypercrosslinked polystyrenes during solvent adsorption and desorption

Modelling hydraulic conductivity for porous building materials based on a prediction of capillary conductivity at capillary saturation

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