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Orthokinetic Shear-induced aggregationof carboxylated polymer lattices book of latex particles containing high levels of surface carboxylation was studied by shearing for short times in a rotational viscometer and measuring changes in particle size using photon correlation spectroscopy.
Results can be interpreted in terms of a comparison between the DLVO repulsive force between a pair of particles and the Cited by: The stability of the carboxylated latices under shear was much reduced at pH values >7 when the surface groups are ionised.
The increase in suspension viscosity with pH was shown to be critical in determining the onset of aggregation via hydrodynamic by: systems, the zero shear rate viscosity is related to the intrinsic viscosity by a Taylor series expansion where [Ł] is the intrinsic viscosity, or limiting viscosity number17(in units of mL/g), Ł s is the solvent viscosity, c is concentration (in mL/g), and k′is the Huggins coefficient16 specific to a given polymer-solvent pair.
Rajesh H. Somani, Igors Sics and Benjamin S. Hsiao, Thermal stability of shear‐induced precursor structures in isotactic polypropylene by rheo‐X‐ray techniques with couette flow geometry, Journal of Polymer Science Part B: Polymer Physics, 44, 24, (), ().
Effect of Temperature on Shear-Induced Anisotropic Structure in Polymer Clay Hydrogels Jun Li,*1,2 Jun Jiang,3 Chunhua Li,3 Min Y.
Description Shear-induced aggregationof carboxylated polymer lattices PDF
Lin,a Steven A. Schwarz,*1 Miriam H. Rafailovich,3 Jonathan Sokolov3 1Department of Physics, Queens College, City University of New York, Flushing, New YorkUSA Fax: (þ1) ; E-mail: [email protected]
The full text of this article hosted at is unavailable due to technical difficulties. Journal of Applied Polymer Science 92 (/app.v), Shear-induced instabilities in layered liquids Günter Auernhammer, Helmut Brand, Harald Pleiner.
AFM. The shear-induced crystallized iPP sample at °C for s was quenched to room temperature. The permanganic etching method initially developed by Bassett and Olley and modified later was applied to prepare the sample for AFM measurement.
Etching was performed by shaking the sample in a 2% solution of potassium permanganate in a mixture (10 volume Cited by: Shear-induced crystallization is of great technological importance in all fabrication processes such as injection moulding, extrusion, fiber spinning and film blowing.
Ideally one would like to know how external shear influence: the entropy and enthalpy of the melt state, the equilibrium melting temperature, the nucleation density, the Cited by: Shear-induced mixing or demixing of polymer blends have both been observed.
Shear-induced mixing is the typical behaviour of blends of low molar mass polymers and polymer solu- tions. However, shear-induced demixing can be observed for solutions of high molar mass polymers or polymer blends at high shear : Ian W Hamley, Valeria Castelletto, Zhou Yang.
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To provide insight into the formation of shear-induced precursor structures, three apparently unrelated subjects are analyzed and discussed: the saturation of. The shear induced crystallization of the poly(m-xylylene adipamide) (MXD6) which is a semi-aromatic polyamide, was studied for a virgin (PA1) and a.
In-situ synchrotron small-angle X-ray scattering (SAXS) was used to follow orientation-induced crystallization of isotactic polypropylene (i-PP) in the subcooled melt at °C after step shear under isothermal conditions. The melt was subjected to a shear strain of % at three different shear rates (10, 57, and s-1) using a modified Linkam shear stage.
Shear induced structure in phase separated polymer solutionsy Carlo van Overbeek Aug Abstract The behavior of phase separated polymer solutions under shear was studied by confocal microscopy in cone-plate and coaxial cylinder shear geometries.
The observations were combined with macroscopic. Keywords Polymer–clay composites Light scattering yield-stress Stress relaxation Shear-induced structure 1 Introduction The interesting properties of complex ﬂuids result from internal structure on length scales much larger than the atomic scale.
The imposition of shear can modify this structure via two competing effects: The shear can. The die gap was mm with the winder speed adjusted such that the final film thickness was ca. The casting roll was set at 65[degrees]C.
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The length of the die land region where shear-induced diffusion is expected to occur--between the coathanger section and the die exit--was approximately 5 cm. Two novel phenomena were observed in steady and transient shear measurements which were made in a Couette device of a R‐17 Weissenberg Rheogoniometer with suspensions of polystyrene spheres, 40–50 μm in diameter, suspended in a mixture of silicone oils at volume fractions 0⩽φ When φ⩾, the steady‐shear viscosity at a given shear rate was found to Cited by: Polymer Injection Molding: Flow-induced Crystallization A model for the description of the combined process of quiescent and ﬂow-induced crystallization of chamodelitshouldbecome possible to predict in detail the spatial distribution of the crystalline structure in a product and, from that.
A number of studies on the effect of shear on the crystalliza-tion of CB have been conducted. InFeuge et al. (7) was the ﬁrst to report a solid-to-solid transformation of CB from a less stable form (Form II) to the more thermodynamically sta-ble one (Form V) by mechanical work consisting of repeated extrusion under pressure (≤ psi).
utilized to monitor the shear-induced patterns that are formed during the application of shear ﬁeld. The pattern-forming process is analysed as a function of shear time and shear rate. In the latter part of this report, the origin of constituent material of the shear-induced aggregates is discussed.
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