Osmotic pressures of moderately concentrated polydimethylsiloxane solutions

Kuwahara, N.; Okazawa, T.; Kaneko, Motozo

doi:10.1002/polc.5070230211

Cited by 49 publications

(11 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also listed are the values of χ found in the literature as obtained from swelling experiments. [50][51][52][53][54] The difference between these values and the ones calculated in this paper is less than 15%.…”

Section: Interpretation Of the Elastic Constants Using The Florymentioning

confidence: 87%

Indentation of polydimethylsiloxane submerged in organic solvents

Chen

Whitesides

et al. 2011

J. Mater. Res.

View full text Add to dashboard Cite

This paper uses a method based on indentation to characterize a polydimethylsiloxane (PDMS) elastomer submerged in an organic solvent (decane, heptane, pentane, or cyclohexane). An indenter is pressed into a disk of a swollen elastomer to a fixed depth, and the force on the indenter is recorded as a function of time.By examining how the relaxation time scales with the radius of contact, one can differentiate the poroelastic behavior from the viscoelastic behavior. By matching the relaxation curve measured experimentally to that derived from the theory of poroelasticity, one can identify elastic constants and permeability. The measured elastic constants are interpreted within the Flory-Huggins theory. The measured permeabilities indicate that the solvents migrate in PDMS by diffusion, rather than by convection. This work confirms that indentation is a reliable and convenient method to characterize swollen elastomers. a email address: suo@seas.harvard.edu

show abstract

Section: Interpretation Of the Elastic Constants Using The Florymentioning

confidence: 87%

Indentation of polydimethylsiloxane submerged in organic solvents

Chen

Whitesides

et al. 2011

J. Mater. Res.

View full text Add to dashboard Cite

show abstract

“…It should be noted, however, that the previous work this study is based on was performed with two different χ parameters used to determine 1/ M c,sw in this comparison. Chassé et al initially used the χ parameter published by Horkay et al (χ = 0.459 + 0.134ϕ p + 0.59ϕ p 2 ) but later followed with a correction that used the χ parameter published by Kuwahara et al (χ = 0.445 + 0.297ϕ p ) based on an improved correlation M c,sw with M c,NMR data as well as theoretical calculations. We have examined the correlation of D res, n with 1/ M c,sw using the updated χ parameter in Figure S7.…”

Section: Resultsmentioning

confidence: 99%

Nonideality in Silicone Network Formation via Solvent Swelling and ¹H Double-Quantum NMR

et al. 2018

View full text Add to dashboard Cite

The versatile cross-linking chemistry of poly(dimethylsiloxane) (PDMS)-based materials affords a large research space in which polymers with widely varying elastomeric properties may be synthesized. Parameters such as chain length, cross-link density, cross-link functionality, filler content, and chain chemistry can all be modified to produce materials with specific physical and mechanical properties. Commercial polysiloxane-based, “silicone” elastomers are generally intractable, which makes the precise characterization of their networks problematic. We report here the application of equilibrium solvent uptake analysis and 1H double-quantum nuclear magnetic resonance (1H DQ NMR) spectroscopy to determine the network topology of end-linked PDMS networks with nonideal network topology. Despite their structural complexity, we can quantify both the classical and nonclassical contributions to network structure using 1H DQ NMR which are in reasonable agreement with solvent uptake data. These findings serve as the foundation for future investigations of even more complex commercial silicones using 1H DQ NMR.

show abstract

“…(Kuwahara et al, 1968). The Flory-Huggins interaction parameter χ is calculated to be relatively large (0.82) (Grulke, 1989):…”

Section: Diffusion Coeffi Cientmentioning

confidence: 99%

“…A high value for c eq indicates a strong interaction between DCM and PDMS and/or a high free-volume polymer matrix. DCM has a solubility parameter of 19.64 (MPa) 0.5 , while the solubility parameter of uncrosslinked PDMS is 15.3 (MPa) 0.5 (Kuwahara et al, 1968). The Flory-Huggins interaction parameter χ is calculated to be relatively large (0.82) (Grulke, 1989):…”

Section: Diffusion Coeffi Cientmentioning

confidence: 99%

Mass Transport Through PDMS/Clay Nanocomposite Membranes

Liu

Kée

2007

Can J Chem Eng

View full text Add to dashboard Cite

Polymer-clay composites have been produced using a broad range of polymers, such as polystyrene, polypropylene, poly(dimethylsiloxane), poly(ethylene oxide), polyamide, polycaprolactone, poly(L-lactide), liquid crystalline copolyesters, polyimide, epoxy, and poly(methylmetacrylate). The development of nanocomposites has typically involved intercalation of a suitable monomer followed by in situ polymerization. There is also a solution approach, in which the silicate clay and the polymer are intercalated in a solvent, and a melt intercalation approach, in which a molten thermoplastic is blended with silicate clay.Industrial processes such as painting, solvent degreasing, printing, dry-cleaning, polymer synthesis and fi bre spinning from solution involve the use of larger amounts of solvents such as toluene, xylene, dichloroethane, trichloroethane, dichloromethane and acetone, which contribute to the air pollution in the United States (Lahiere et al., 1993;Singh et al., 1998). Highly permeable and vapour selective polymeric membranes can be used to separate vapours from air streams and to recover such Poly(dimethylsiloxane)/clay nanocomposite membranes have been synthesized and mass transport properties through those nanocomposite membranes have been investigated. The effect of mechanical deformation on the transport properties of the PDMS (nanocomposite) membranes has also been studied. With the introduction of clay particles into the polymer matrix, mass transport is reduced, likely due to the longer diffusion path, which slows the diffusion process. The effect of membrane extension on diffusion is more complicated. Under small deformation, the permeation fl ux decreases, but under high deformation, it shows an enhanced diffusion. As the clay particle concentration increased, the effect of external deformation is reduced, and an enhanced diffusion is observed.On a synthétisé des membranes en nano-composites de polydiméthysiloxane et d'argile dans le but d'étudier leurs propriétés de transfert de matière. L'effet de la déformation mécanique sur les propriétés de transfert de ces membranes a également été étudié. Avec l'introduction des particules d'argile dans la matrice des polymères, le transfert de matière est réduit, probablement en raison du chemin de diffusion qui est plus long, ce qui ralentit le processus de diffusion. L'effet de l'extension des membranes sur la diffusion est plus compliqué. Sous faible déformation, le fl ux de perméation diminue, mais sous forte déformation, la diffusion est améliorée. Lorsque la concentration de particules d'argile augmente, l'effet de la déformation externe est réduit, et une meilleure diffusion est observée.

show abstract

Osmotic pressures of moderately concentrated polydimethylsiloxane solutions

Cited by 49 publications

References 35 publications

Indentation of polydimethylsiloxane submerged in organic solvents

Indentation of polydimethylsiloxane submerged in organic solvents

Nonideality in Silicone Network Formation via Solvent Swelling and ¹H Double-Quantum NMR

Mass Transport Through PDMS/Clay Nanocomposite Membranes

Contact Info

Product

Resources

About

Osmotic pressures of moderately concentrated polydimethylsiloxane solutions

Cited by 49 publications

References 35 publications

Indentation of polydimethylsiloxane submerged in organic solvents

Indentation of polydimethylsiloxane submerged in organic solvents

Nonideality in Silicone Network Formation via Solvent Swelling and 1H Double-Quantum NMR

Mass Transport Through PDMS/Clay Nanocomposite Membranes

Contact Info

Product

Resources

About

Nonideality in Silicone Network Formation via Solvent Swelling and ¹H Double-Quantum NMR