Manifestation of phase separation processes in oscillatory shear: droplet-matrix systems versus co-continuous morphologies

Vinckier, Inge; Laun, H. M.

doi:10.1007/s003970050179

Cited by 102 publications

(110 citation statements)

References 14 publications

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“…In other case, the structure is declared as cocontinuous only It has been reported that the frequency dependence of the loss modulus G" of the blend with the bicontinuous structure is also expressed by the power law G" ~ w m with the exponent m somewhat smaller than n. [25][26][27][28] The same result is obtained in the present study, although the reason for m < n is not known.…”

Section: The Bicontinuoussupporting

confidence: 86%

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Creep Behavior of a Polymer Blend Melt and 3D Observation of the Deformed Bicontinuous Structure by a High-contrast X-ray CT

Takahashi

Hatakeyama

Nishikawa

2016

J. Soc. Rheol., Jpn

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Dynamic viscoelastic, creep and steady shear flow measurements are made on a polymer blend melt with a phaseseparated bicontinuous structure. 3D structures at quiescent, constant-stress and constant-shear-rate states are observed by a high-contrast X-ray computerized tomography (CT) after quick quenching of each sample. At the quiescent state, the frequency dependence of the storage modulus at 200 o C shows a power law behavior with the exponent of 0.84. In the shear rate range (at the small shear stress s = 100 Pa) where partial relaxation of the interface of the blend is possible, a peculiar plate-like pattern in the deformed bicontinuous network is observed in the through view of the X-ray CT image. At higher shear rates (at the higher shear stress s = 1000 Pa) where the interface relaxation is suppressed, another peculiar short plate-like pattern appears in the edge view. When the shear rate in the steady shear flow is equal to the average shear rate in the creep test, a very similar deformed pattern of the interface is observed.At the macroscopic shear strain of 3.2 in the creep test at 100 Pa, the observed strain of the deformed bicontinuous network has a distribution and the majority are much smaller than the strain expected from the affine deformation assumption. An average orientation angle of the deformed network at the shear strain of 3.2 corresponds to the angle given by the affine deformation of the shear strain 1.35.

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Section: The Bicontinuoussupporting

confidence: 86%

“…[25][26][27][28][29] The reported exponent n is in the rage of 0.5 < n ≤ 1. However, in all these reports, detailed study on the phase separated structure is missing.…”

Section: The Bicontinuousmentioning

confidence: 99%

Creep Behavior of a Polymer Blend Melt and 3D Observation of the Deformed Bicontinuous Structure by a High-contrast X-ray CT

Takahashi

Hatakeyama

Nishikawa

2016

J. Soc. Rheol., Jpn

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“…[18][19][20][21] The behavior similar to the percolation threshold, G' ∼G" ∼ω n with tanδ = tan(nπ/2), was also observed 22) . However, these behaviors are somewhat vague due to the coarsening of bicontinuous structure during rheological measurement and to possible acceleration of domain growth (or break up) affected by small (or large) amplitude oscillation.…”

Section: Resultsmentioning

confidence: 58%

Dispersion State of Zirconium Oxide Particles in Polymer Blends and Viscoelastic Behavior of the Composites

Takahashi

Osawa

Jinnai

et al. 2007

J. Soc. Rheol., Jpn

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Zirconium oxide (ZrO 2 ) particles are dispersed in polystyrene (PS)/poly(butyl methacrylate) (PBMA) and PS/ poly(methyl methacrylate) (PMMA) blend melts with bicontinuous structure. ZrO 2 particles enter exclusively into PBMA phase in PS/PBMA blend, while the particles exist in both phases in PS/PMMA blend. The main cause for the exclusive localization in PBMA phase is the lowest entropy loss of the most flexible PBMA chains among the three polymers due to adsorption onto ZrO 2 particles. In PBMA phase, spherical aggregates of ZrO 2 particles are formed at a concentration of 11 vol%, while ZrO 2 particles make linear arrays at 21 vol% and branches at 29 vol%. These arrays and branches give very high second-plateau in G' at low frequencies. In PS/PMMA blend melt, linear arrays and branches appear in both phases even at 4.4 vol%, and network structure is formed at 11 vol%. Due to the structural difference, the PS/PMMA/ZrO 2 composite gives much higher second-plateau than that of PS/PBMA/ZrO 2 , when compared at the same vol% of ZrO 2 . A peculiar network structure is observed in PS/ZrO 2 composite at a low concentration of 4.4 vol%. The low value of G' close to that of the matrix at intermediate frequencies with a small number of spherical aggregates indicates very weak adsorption of PS chains to ZrO 2 particles.

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“…Representative Institution number [1] V. Altstädt Until 1995: BASF, Ludwigshafen, Germany; 1995-2000: TU Hamburg-Harburg, Hamburg, Germany; Since 2000: University Bayreuth, Bayreuth, Germany [2] L. Glas Shell, Ottignies Lovain la Neuve, Belgium [3] B. Pukánszky TU Budapest, Budapest, Hungary [4] D. W. Schubert GKSS, Geesthacht, Germany [5] G. H. Michler University Halle-Wittenberg, Merseburg, Germany J. Laatsch [6] R. Moore ICI Technology, Middlesbrough Cleveland, England [7] J. G. Williams Imperial College, London, UK [8] F. Ramsteiner BASF, Ludwigshafen, Germany…”

Section: Laboratorymentioning

confidence: 99%

“…In a paper by V. Schytt and J. Lyngaae-Jørgensen [2], the limits of miscibility in the quiescent state and during flow has been discussed. I. Vinckier and H. M. Laun reported the manifestation of the interface in oscillatory shear measurements [3,4], and Z. I. Zang, Y. L. Yang, I. Vinckier, and H. M. Laun compared, measured, and simulated morphologies under oscillatory shear [5]. D. W. Schubert investigated the χ-parameter and the phase diagram of PαΜSAN/PMMA blends by cloudpoint and neutron-scattering techniques [6].…”

Section: Historic Backgroundmentioning

confidence: 99%

Rheological and mechanical properties of poly(α-methylstyrene-co-acrylonitrile)/ poly[(methyl acrylate-co-methyl methacrylate)] blends in miscible and phase separated regimes of various morphologies. Part IV: Influence of the morphology on the mechanical properties (IUPAC Technical Report)

Altstädt¹,

Freitas²,

Schubert³

2004

Pure and Applied Chemistry

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Manifestation of phase separation processes in oscillatory shear: droplet-matrix systems versus co-continuous morphologies

Cited by 102 publications

References 14 publications

Creep Behavior of a Polymer Blend Melt and 3D Observation of the Deformed Bicontinuous Structure by a High-contrast X-ray CT

Creep Behavior of a Polymer Blend Melt and 3D Observation of the Deformed Bicontinuous Structure by a High-contrast X-ray CT

Dispersion State of Zirconium Oxide Particles in Polymer Blends and Viscoelastic Behavior of the Composites

Rheological and mechanical properties of poly(α-methylstyrene-co-acrylonitrile)/ poly[(methyl acrylate-co-methyl methacrylate)] blends in miscible and phase separated regimes of various morphologies. Part IV: Influence of the morphology on the mechanical properties (IUPAC Technical Report)

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