Cooperative Diffusion of Concentrated Polymer Solutions:  A Static and Dynamic Light Scattering Study of Polystyrene in DOP

Nicolai, Taco; Brown, Wyn

doi:10.1021/ma946430p

Cited by 36 publications

(31 citation statements)

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“…15,[59][60][61][62] There has been an ongoing discussion in the literature about the correct formulation of the collective diffusion coefficient of polymer solutions within the frictional formalism. Here, we follow the notation used by Nicolai and Brown,4 which is in agreement with arguments of Vink. 63 Other authors omit the factor (1Ϫ) 2 in Eq.…”

Section: A Mass Diffusion Coefficientmentioning

confidence: 98%

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Collective and thermal diffusion in dilute, semidilute, and concentrated solutions of polystyrene in toluene

Rauch

Köhler

2003

The Journal of Chemical Physics

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Correlation between thermal diffusion and solvent self-diffusion in semidilute and concentrated polymer solutions Thermal and mass diffusion in a semidilute good solvent-polymer solution Collective mass diffusion ͑D͒, thermal diffusion (D T ), and Soret coefficients (S T ) have been determined for solutions of polystyrene in toluene ranging from dilute (10 Ϫ4 g/cm 3 ) to concentrated ͑0.9 g/cm 3 ͒ by a transient holographic grating technique and photon correlation spectroscopy ͑collective diffusion only͒. The molar mass range of the polymer was between 4.75 and 4060 kg/mol. With a slight exception at intermediate concentrations, D T is molar mass independent over the entire concentration range. Above a polymer concentration of CϷ0.2 g/cm 3 the rising glass transition temperature of the solution leads to a rapid slowing down of both mass and thermal diffusion ͑Ludwig Soret effect͒ and the structure relaxation enters the experimental time window.Both D and D T are governed by the same microscopic local viscosity eff , which increases dramatically at T g . It cancels out in S T ϭD T /D. As a consequence, S T is completely insensitive to the glass transition and shows concentration-dependent scaling as expected for a fictive polymer solution with concentration-independent local friction. Where available, results are compared with literature data.

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Section: A Mass Diffusion Coefficientmentioning

confidence: 98%

“…Based on a model of Vrentas et al, 66 it is shown in Ref. 4 that D can be written in a Stokes-Einstein-type form,…”

Section: A Mass Diffusion Coefficientmentioning

confidence: 99%

Collective and thermal diffusion in dilute, semidilute, and concentrated solutions of polystyrene in toluene

Rauch

Köhler

2003

The Journal of Chemical Physics

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“…40,114,115 Experiments around the Y condition indicate that the solvent quality has a profound effect on the slow relaxation. [48][49][50][51][52][53][54] Actually, not everyone accepts or recognizes such a slow mode, even though it has been repeatedly observed for more than three decades. In the last two decades, advancements of LLS instrumentation, including the full digital time correlator and computer, have made the dynamic study of semidilute solutions much easier and more reliable, but the preparation of dust-free viscous semidilute solutions still remains an experimental challenge.…”

Section: Llsmentioning

confidence: 99%

The slow relaxation mode: from solutions to gel networks

Ngai

2010

Polym J

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In the past, many laser light-scattering experimental results revealed that besides the fast relaxation mode, there existed an additional slow mode in semidilute solutions. This slow mode has been assigned to a variety of origins, but there has been no clear and well-accepted explanation. As the polymer concentration increases, the slow relaxation mode persists in the concentrated region, in melts and in gels in which polymer chains are crosslinked instead of entangled. The slow relaxation mode has also been reported for charged macromolecules in aqueous and nonaqueous solutions. However, it is generally thought to be different in nature from that observed in semidilute neutral polymer solution. In recent years, armed with novel solution preparation methods and some specially designed polymers, we have reexamined the dynamics of polymer chains, especially the slow mode, in semidilute neutral polymer solutions, dilute polyelectrolyte solutions and gels, which are reviewed here. Our results suggest that the slow mode can be qualitatively considered as hindered motions of interacting chains even though the nature of interaction can be very different; namely, from the weak segment-segment interaction in a less good solvent to strong electrostatic interaction among polyelectrolyte chains, and even to chemical crosslinking inside gel networks.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] These include: [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] These include:…”

Section: Plasticizer Diffusion Rate and The Methods Of Studymentioning

confidence: 99%

Plasticizer Motion and Diffusion

2012

Handbook of Plasticizers

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Cooperative Diffusion of Concentrated Polymer Solutions: A Static and Dynamic Light Scattering Study of Polystyrene in DOP

Cited by 36 publications

References 20 publications

Collective and thermal diffusion in dilute, semidilute, and concentrated solutions of polystyrene in toluene

Collective and thermal diffusion in dilute, semidilute, and concentrated solutions of polystyrene in toluene

The slow relaxation mode: from solutions to gel networks

Plasticizer Motion and Diffusion

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