High polymer solutions. III.—the relation between intrinsic viscosity and molecular weight for polystyrene fractions in benzene, toluene, chloroform, ethyl benzene and methyl ethyl ketone

Bawn, C. E. H.; Freeman, R. F. J.; Kamaliddin, A. R.

doi:10.1039/tf9504601107

Cited by 137 publications

(9 citation statements)

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“…Intrinsic viscosity is correlated in terms of the empirical Mark-Houwink relation [q] = KMa (A31 In chloroform, K = 1.12 x lO--4 dl/g and a = 0.73 (Bawn et al, 1950). In dichlorethane, K = 2.1 x 10-4 dl/g and a = 0.66 (Outer et al, 1950).…”

Section: Notationmentioning

confidence: 99%

Diffusion and partitioning of macromolecules within finely porous glass

1975

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Measurements of diffusion and partitioning of nearly monodisperse polystyrene, having molecular weights of from 600 to 670,000, in chloro‐form and dichloroethane and of two proteins in aqueous solution were made with leached borosilicate glass cubes having a narrow pore size distribution and pore radi of from 2.5 to 47.6 nm. With increasing ratio of molecular to pore size, the partition coefficient for all solutes decreased; the ratio of effective to bulk diffusivity decreased for the proteins but remained constant for polystyrene. This suggests that polystyrene behaved like a free‐draining macromolecule under the conditions of this study.

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Section: Notationmentioning

confidence: 99%

Diffusion and partitioning of macromolecules within finely porous glass

1975

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“…[ 14 ] It is a well‐known fact, that an increasing polymerization degree as well as an increasing number of polystyrene molecules in a solvent, styrene in our case, increases the viscosity of a polymeric solution. [ 15 ] Furthermore, temperature has a strong impact on the viscosity of a concentrated polymer solution, which becomes more pronounced with increasing polymer concentration. [ 16 ] We propose that the variations in the viscosity of the polymeric phase are responsible for the development of the different particle morphologies and surface textures.…”

Section: Resultsmentioning

confidence: 99%

Interfacial Instability as Shaping Mechanism for Polystyrene Particles with Tunable Surface Texture

Stein

Volkmer

2021

Adv Materials Inter

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Surfactant‐driven interfacial instability of emulsion droplets has recently emerged as a means for shaping polymeric particles with controllable surface texture. This paper presents a suspension polymerization‐based method to produce surface‐textured polystyrene particles by inducing an instability at the interface of prepolymerized emulsion droplets followed by rapid cooling. The interaction of two surface‐active components, i.e., arachidic acid and cetyltrimethylammonium bromide (CTAB) at the phase boundary triggers the interfacial deformation at a specific point in time. Rapid cooling freezes the deformed emulsion droplets in a nonequilibrium state. Viscosity is proposed as the key parameter influencing the particle morphology, which can be controlled by easily adjustable factors such as initiator concentration, temperature, time, and cooling rate. Contact angle hysteresis measurements of particle thin layers spread on a flat substrate reveal a strong influence of the particle surface texture on the wetting behavior. The presented particle synthesis method requires no specialized equipment and has a high potential for upscaling, making it promising for various applications including hydrophobic coatings, catalyst supports, separation technology, tissue engineering, or drug delivery.

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“…The coefficients a as well as K have been determined experimentally for many widely used polymers. a is equal to 0.73 for polystyrene in several solvents including dichloromethane, K = 11× 10 -3 mL/g.…”

Section: Resultsmentioning

confidence: 99%

Photoinduced Electron Transfer between Polystyrene and 2,4,6-Triphenylpyrylium Tetrakis(pentafluorophenyl)gallate in Solutions and in Polymer Films

2003

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Photoinduced electron transfer between polystyrene and 2,4,6-triphenylpyrylium tetrakis(pentafluorophenyl)-gallate (TPPGa) has been studied in dichloromethane solution and in poly(vinyl chloride) film by steady state and time-resolved fluorescence quenching techniques. A dependence of the observed rate constant of fluorescence quenching and the theoretical dependence of the diffusion constant on the molecular weight of the polystyrene were derived. Positive curvature in Stern-Volmer plots for quenching with polystyrene and toluene in solution and negative curvature in the Perrin plot for polystyrene in film was observed. No new absorption or fluorescence bands appeared upon addition of the donor to the dichloromethane solution of TPPGa. Forward and back electron transfer is the possible pathway for stabilization of TPPGa in polystyrene because 100% of TPPGa can be recovered even after prolonged irradiation.

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High polymer solutions. III.—the relation between intrinsic viscosity and molecular weight for polystyrene fractions in benzene, toluene, chloroform, ethyl benzene and methyl ethyl ketone

Cited by 137 publications

References 0 publications

Diffusion and partitioning of macromolecules within finely porous glass

Diffusion and partitioning of macromolecules within finely porous glass

Interfacial Instability as Shaping Mechanism for Polystyrene Particles with Tunable Surface Texture

Photoinduced Electron Transfer between Polystyrene and 2,4,6-Triphenylpyrylium Tetrakis(pentafluorophenyl)gallate in Solutions and in Polymer Films

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