Studies in Newtonian Flow. III. The Dependence of the Viscosity of Liquids on Molecular Weight and Free Space (in Homologous Series)

Doolittle, Arthur K.

doi:10.1063/1.1702182

Cited by 275 publications

(69 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…An expression similar to that of Doolittle (1951Doolittle ( , 1952 a characteristic parameter of the available free volume fraction and f, the fractional free volume of the system is given by: (37) where φ i and f i are respectively the volume fraction and the free volume fraction of the component i. D T is in fact the thermodynamic diffusion coefficient of the penetrant defined by (Comyn, 1985):…”

Section: General Considerationsmentioning

confidence: 99%

Transport Properdines of Gases in Polymers: Bibliographic Review

Klopffer

Flaconnèche

2001

Oil & Gas Science and Technology - Rev. IFP

257

196

View full text Add to dashboard Cite

Résumé -Transport de molécules gazeuses dans les polymères : revue bibliographique -Après quelques rappels concernant les lois classiques des phénomènes de transport, cet article, purement bibliographique, présente les différents modèles théoriques proposés pour décrire le mécanisme de transport d'espèces chimiques dans les polymères par diffusion moléculaire. Il s'appuiera ensuite sur de nombreuses études menées antérieurement, pour montrer que la perméabilité des gaz (ou vapeurs organiques) dépend fortement de la structure du polymère (cristallinité, histoire thermomécanique), de la taille et de la nature du pénétrant ainsi que des conditions de température et de pression.Mots-clés : polymère, gaz, perméabilité, diffusion, solubilité. Abstract -Transport Properties of Gases in

show abstract

Section: General Considerationsmentioning

confidence: 99%

Transport Properdines of Gases in Polymers: Bibliographic Review

Klopffer

Flaconnèche

2001

Oil & Gas Science and Technology - Rev. IFP

257

196

View full text Add to dashboard Cite

show abstract

“…The deviation of the α relaxation from the Arrhenius behaviour may be quantified by the fragility parameter D 0 [44][45] in a modified form of the VFTH equation…”

Section: Dielectric Measurementsmentioning

confidence: 99%

Relaxational study of poly(vinylpyrrolidone-co-butyl acrylate) membrane by dielectric and dynamic mechanical spectroscopy

Redondo-Foj¹,

Carsí²,

Ortiz-Serna³

et al. 2013

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A poly(vinylpyrrolidone-co-butyl acrylate) (60VP-40BA) membrane has been synthesized as a tractable and hydrophilic material, obtaining a water swelling percentage around 60%. An investigation of molecular mobility by means of Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and Broadband Dielectric Relaxation Spectroscopy (DRS) has been fulfilled in the dry membrane. Dielectric and viscoelastic relaxation measurements have been carried out on the 60VP-40BA sample at several frequencies between -150ºC to 150ºC .The dielectric spectrum shows several relaxation processes labelled as γ, β and α in increasing order of temperature, whereas in the mechanical spectrum only the β and α relaxation processes are completely defined. In the dielectric measurements, conductive contributions overlap the α-relaxation. The apparent activation energies have similar values for the β-relaxation in both, the mechanical and the dielectric measurements. The β process is related to the local motions of the pyrrolidone group and the γ process is connected with the butyl units motions, both located in the side chains of the polymer.

show abstract

“…The WLF relationship has been widely used for modeling the temperature dependent viscosity behavior of various polymers and polymer blends near the T g [49,50]. The WLF relationship also enjoys success in the modeling of dielectric responses and ionic conductivity of various epoxy amine systems [46,47].…”

Section: Theorymentioning

confidence: 99%

Vinyl-Ester (VE) Cure Characterization Via Direct Current Sensors

Fink¹

2001

View full text Add to dashboard Cite

.High-performance thermosetting composites typically consist of a high-modulus fibrous material embedded in a thermosetting polymer matrix. The behavior of the resulting composite depends on the properties of the reinforcement, the interphase, and the matrix. Vinyl-ester (VE) resins are relatively low-cost matrix resins used in liquid molding of large structures such as contiguous vehicle huUs. In liquid-molding processes, quality-control sensors can ensure resin impregnation of the preform and cure of the resin after infiltration. For these purposes, SMARTweave (SW), based on direct current (DC) sensing, is used as an in-situ flow-front detection and curemonitoring system. SW measures change in the ionic conductivity with cure, which can then be related to the material properties like viscosity and degree of cure. This enables in-situ measurement of degree of cure and viscosity development during cure from SW measurements. This report builds on previous modeling work that assumed a direct dependence of DC resistance on the resin viscosity, limiting the use of such models beyond gelation. This report presents a continuum model based on free volume theory to describe ionic conductivity through gelation to vitrification.

show abstract

Studies in Newtonian Flow. III. The Dependence of the Viscosity of Liquids on Molecular Weight and Free Space (in Homologous Series)

Cited by 275 publications

References 3 publications

Transport Properdines of Gases in Polymers: Bibliographic Review

Transport Properdines of Gases in Polymers: Bibliographic Review

Relaxational study of poly(vinylpyrrolidone-co-butyl acrylate) membrane by dielectric and dynamic mechanical spectroscopy

Vinyl-Ester (VE) Cure Characterization Via Direct Current Sensors

Contact Info

Product

Resources

About