Diffusion of methylene chloride and tetrahydrofuran in amorphous poly(ether ether ketone)

Cornélis, Hélène; Kander, Ronald G.

doi:10.1016/s0032-3861(96)00334-5

Cited by 7 publications

(9 citation statements)

References 13 publications

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“…This phenomenon has usually being neglected in most theoretical work and causes deviation as compared to experimental results. 7 The principal result discovered in this work is that crystallinity behind the diffusion front increases suddenly and markedly as the concentration fields of fronts moving from opposite surfaces begin to overlap. This increase in crystallization rate can be understood in terms of swelling effect since the sample dimension increased quite dramatically after the overlap.…”

Section: Discussionmentioning

confidence: 71%

Solvent-Induced Crystallization in Poly(ethylene terephthalate) during Mass Transport: Mechanism and Boundary Condition

et al. 2004

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The mechanism of mass transport and the related crystallization in poly(ethylene terephthalate) (PET) were studied. Solvent-induced crystallization can occur during the transport process in PET at low temperature. The important effect of changing the surrounding medium to solvent molecules is to reduce the glass transition temperature. This phenomenon is called “plasticization”. The extent of plasticization relies on the amount of solvent around the polymer molecules, i.e., the concentration of solvent which will depend on the mass transport before saturation. Evidences for the transport mechanism in the first stage of crystallization were revealed. The distinct diffusion front was determined from the measurements of optical microscope and microhardness. The differential scanning calorimeter (DSC) curves displayed crystallization exothermic peaks whose areas decreased with the amounts of amorphous regions, representing the solvent-induced crystallization (SINC) process. The observed phenomenon of multiple-stage crystallizations is associated with the variation of boundary conditions during mass transport, which was ignored in most theoretical analyses.

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Section: Discussionmentioning

confidence: 71%

Solvent-Induced Crystallization in Poly(ethylene terephthalate) during Mass Transport: Mechanism and Boundary Condition

et al. 2004

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“…Many changes are associated with the permeation of a solvent through a polymer under an external stress. For example, stressinduced crystallization 1-7, 26,49 and solvent-induced crystallization 51,52 are often observed, leading to a decrease in the permeability and diffusion coefficient. Daldsen 26 found that highly stretched, unvulcanized rubber had a lower water permeability than that of unstretched rubber because this process crystallizes the rubber.…”

Section: Discussionmentioning

confidence: 99%

Influence of external stress on the barrier properties of rubbers

Kée

Fong

et al. 1999

J. Appl. Polym. Sci.

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ABSTRACT:The effect of an external stress on the barrier properties of natural, bromobutyl, and nitrile rubber were studied using a modified ASTM permeation method. Stress-induced changes such as a decrease in the breakthrough time with mechanical elongation was observed. Upon application of a small mechanical deformation, little change was observed in terms of steady-state permeation flux. On the other hand, a stress-enhanced diffusion was observed for most of the solvent/rubber pairs studied.

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“…119 In some cases, the presence of solvent can lead to polymer crystallization. 120 The ordered crystalline structure then rejects the solvent that was absorbed prior to its formation. A maximum in the diffusion curves is also to be expected.…”

Section: Effect Of Permeant and Polymer Structure On Permeationmentioning

confidence: 99%

Viscoelastic (Non‐Fickian) Diffusion

2005

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This review paper deals with mass transport in macromolecular materials. The study of mass transport through polymeric composite materials for example has applications in a variety of areas such as coatings, packaging and gas separations, to name just a few. Here we discuss several models for diffusion as well as several experimental techniques. In particular, we discuss models for case II diffusion, from a continuum mechanics point of view as well as via a mesoscopic theory. Variables such as temperature, molecular structure and mechanical deformation, affecting mass transport are also discussed.

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Diffusion of methylene chloride and tetrahydrofuran in amorphous poly(ether ether ketone)

Cited by 7 publications

References 13 publications

Solvent-Induced Crystallization in Poly(ethylene terephthalate) during Mass Transport: Mechanism and Boundary Condition

Solvent-Induced Crystallization in Poly(ethylene terephthalate) during Mass Transport: Mechanism and Boundary Condition

Influence of external stress on the barrier properties of rubbers

Viscoelastic (Non‐Fickian) Diffusion

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