Shear-induced transitions in colloidal and polymeric liquids

Malkin, A. Ya.

doi:10.1016/j.cis.2021.102381

Cited by 15 publications

(6 citation statements)

References 119 publications

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“…When considering a multicomponent system with many randomly scattered components, the self-assembling is one of the most frequent and interesting phenomena. General aspects of this issue were discussed in [ 77 , 78 ]. This is a case of cooperative behavior demonstrating a chaos-to-order transition as an example of strong non-linearity in the rheology of multicomponent systems.…”

Section: Solid Particles In Polymeric Liquids—basic Model Of Multicom...mentioning

confidence: 99%

The Role of Structure in Polymer Rheology: Review

Куличихин

Malkin

2022

Polymers

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The review is devoted to the analysis of the current state of understanding relationships among the deformation-induced structure transformations, observed rheological properties, and the occurrence of non-linear effects for polymer liquids (melts, solutions, and composites). Three levels of non-linearity are the base for consideration. The first one concerns changes in the relaxation spectra of viscoelastic liquids, which are responsible for weak non-linear phenomena. The second one refers to the strong non-linearity corresponding to such changes in the structure of a medium that leads to the emergence of a new relaxation state of a matter. Finally, the third one describes the deformation-induced changes in the phase state and/or the occurring of bifurcations and instability in flow and reflects the thermodynamic non-linear behavior. From a structure point of view, a common cause of the non-linear effects is the orientation of macromolecules and changes in intermolecular interaction, while a dominant factor in describing fluid dynamics of polymer liquids is their elasticity. The modern understanding of thixotropic effects, yielding viscoplastic materials, deformation-induced phase transition, and the experimental observations, demonstrating direct correlations between the structure and rheology of polymer liquids, are the main objects for discussion. All these topics are reviewed and discussed mainly on the basis of the latest five-year publications.

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Section: Solid Particles In Polymeric Liquids—basic Model Of Multicom...mentioning

confidence: 99%

The Role of Structure in Polymer Rheology: Review

Куличихин

Malkin

2022

Polymers

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“…Structural transitions induced by shear flow have been reported for many lyotropic and thermotropic LCs. 1,2 For example, binary systems of water and nonionic surfactants of the polyoxyethylene type (C n E m ) undergo a structural transition between the planar lamella and multilamellar vesicle (onion) phase induced by shear flow. [3][4][5][6][7][8] As another example, wormlike micelle systems of cationic surfactants exhibit isotropic (I) to nematic (N) transitions induced by shear flow.…”

Section: Introductionmentioning

confidence: 99%

Calorimetry of phase transitions in liquid crystal 8CB under shear flow

et al. 2023

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“…Mechanical shape deformation of polymers can accompany significant changes in molecular orientation, and the anisotropic alignment of polymer chains often occurs in three dimensions (3D) and heterogeneously at different length scales. − Accurate measurements of molecular orientation with a sufficiently high spatial resolution will facilitate a better understanding of the structure–property relationship of polymers and thus will advance the manufacturing productivity of high-performance materials. However, conventional tomographic methods for 3D orientation measurement, e.g., X-ray scattering, , transmission electron microscopy (TEM) diffraction, , and sample-tilting infrared (IR) dichroism, − are not suitable for large-area imaging because of sample tilting.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Molecular Orientation Imaging of a Semicrystalline Polymer Film under Shear Deformation

Snyder

Rowlette

et al. 2022

Macromolecules

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The 3D molecular orientations of polymer chains are imaged and compared for a quiescent spherulite region and a shear-deformed region of a semicrystalline poly(ε-caprolactone) film. To acquire the images of 3D orientation, we used a newly developed hyperspectral imaging method based on the orthogonalpair polarization IR (OPPIR) analysis. Polymer chains in spherulites are azimuthally aligned perpendicular to the crystal growth direction and axially tilted from the film normal direction. By contrast, polymer chains in a sheared region are azimuthally aligned along the shear direction but axially tilted from the shear direction. The unexpected out-of-plane tilted orientation indicates that orientational relaxation followed shear deformation and occurred predominantly in the out-of-plane direction. Furthermore, incorporating peak deconvolution into the OPPIR analysis shows that the crystalline and amorphous chains are oriented aligned at different angles, possibly due to different orientational relaxation between the two chain configurations.

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Shear-induced transitions in colloidal and polymeric liquids

Cited by 15 publications

References 119 publications

The Role of Structure in Polymer Rheology: Review

The Role of Structure in Polymer Rheology: Review

Calorimetry of phase transitions in liquid crystal 8CB under shear flow

Three-Dimensional Molecular Orientation Imaging of a Semicrystalline Polymer Film under Shear Deformation

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