scholarly journals Sedimentation of fine colloidal particles adsorbed onto a long polymer chain

1997 ◽  
Vol 75 (9) ◽  
pp. 1248-1255 ◽  
Author(s):  
Waldemar Nowicki ◽  
Grażyna Nowicka
Keyword(s):  
Polymer Chain ◽  
Colloidal Particles ◽  
Polymer Molecule ◽  
Sedimentation Equilibrium ◽  
Brownian Motions ◽  
Stability Model ◽  
High Polymers

A system containing aggregates composed of several fine colloidal particles attached to a single very long polymer molecule is considered. It is shown that the sedimentation equilibrium of the system depends on the extent of restriction over the Brownian motions of particles. On the basis of analysis of sedimentation equilibrium, a simple stability model for such systems is developed. The model elucidates the deterioration of the ability of ultralarge polymers to flocculate fine suspensions. Keywords: high polymers, fine colloidal particles, sedimentation, diffusion, flocculation, stabilization of suspensions.

scholarly journals Synthesis, Characterization and Epoxidation ofcis-Enriched New Polycarbonates Catalyzed by Efficient Organotin Compound

2011 ◽  
Vol 8 (s1) ◽  
pp. S318-S322 ◽  
Author(s):  
A. H. Massoudi ◽  
N. Ramazanian ◽  
H. Vahedi ◽  
J. Khodabakhshi
Keyword(s):  
Functional Groups ◽  
Polymer Chain ◽  
Good Yield ◽  
Organotin Compound ◽  
Polymer Structure ◽  
Polymer Molecule ◽  
Polymerization Reaction ◽  
Diphenyl Carbonate ◽  
Double Bonds ◽  
Aromatic Derivative

Presence of active functional groups on polymer chain is a suitable aspect of polymer structure which allows performing next favourite reactions on polymer molecule. In this research a novel aromatic derivative ofcis-but-2-endiol was synthesized as monomer. The synthesized monomer was polymerized using diphenyl carbonate and 1,4-butandiol as second and third monomer along with organotin catalyst. Polymerization reaction performed by using melt-phase transesterification process to produce a new terpolymer of polycarbonate. During the reaction the double bonds are preserved on polymer chain and epoxidized bym-chloroperbenzoic acid (MCBPA) in good yield to demonstrate the reactivity and possibility of performing further reactions on double bonds of polymer.

scholarly journals Kinetic Interpretation of Rheological Behavior of High Polymers

1962 ◽  
Vol 35 (4) ◽  
pp. 1013-1027
Author(s):  
Junji Furukawa
Keyword(s):  
Polymer Chain ◽  
Rheological Behavior ◽  
Maximum Stress ◽  
Life Time ◽  
Polar Groups ◽  
Maximum Value ◽  
Stress Strain Relation ◽  
Constant Rate ◽  
Creep And Stress Relaxation ◽  
High Polymers

Abstract Rheological behavior of high polymers is interpreted in terms of the pseudo crosslinking hypothesis, i.e., polar groups in a polymer form a kind of pseudolink and contribute to the elastic property of the polymer, but such a crossbond as this is not so firm that plastic flow may not occur to some extent. The ratio of real elongation of polymer chain to overall elongation of specimen is demonstrated as the function of slippage of the polymer chain. Creep and stress relaxation are accounted for as the phenomena involving slippage of the chain accompanied by the elongation of the chain and the dissociation of the crossbond. The stress-strain relation in the ease of constant rate drawing is supposed to show the existence of maximum stress according to the hypothesis. Rupture of linear high polymer is also discussed supposing the breakdown of the second crossbond and the breakdown may be concluded when load applied is larger than the maximum value estimated from the equation for the equilibrium crosslinking. The rate of rupture is also discussed and the logarithmic life time in rupture is concluded to be correlated linearly to the load applied.

Study of polymer chain in a solution of colloidal particles

Polymer ◽  
1992 ◽  
Vol 33 (10) ◽  
pp. 2177-2181 ◽  
Author(s):  
D.K. Klimov ◽  
A.R. Khokhlov
Keyword(s):  
Polymer Chain ◽  
Colloidal Particles

Adhesion of High Polymers. 3. Effects of the Size, Shape, and Polarity on Adhesion to Cellophane

1958 ◽  
Vol 31 (4) ◽  
pp. 712-718
Author(s):  
S. S. Voyutskiĭ ◽  
A. I. Shapovalova ◽  
A. P. Pisarenko
Keyword(s):  
Molecular Weight ◽  
Bond Strength ◽  
Diffusion Theory ◽  
Polymer Molecule ◽  
High Polymer ◽  
Short Side ◽  
Polymer Adhesion ◽  
Polar Groups ◽  
Cohesive Properties ◽  
High Polymers

Abstract 1. The method developed by the authors has been used to study the influence of size, form, and polarity of macromolecules on the adhesion of high polymers to cellophane. 2. Adhesion of high polymers to cellophane increases with decreasing molecular weight. However, for maximum bond strength, the cohesive properties of the polymer must also be taken into account. 3. Increase of the number of short side chains in the polymer molecule lowers its adhesion. 4. The adhesion of a polymer to cellophane decreases with increasing contents of polar groups in its macromolecules. 5. The results are explained on the basis of the diffusion theory of high polymer adhesion developed by the authors.

Two-dimensional Brownian Motions of Polyacrylamide-modified Colloidal Particles

2012 ◽  
Vol 41 (10) ◽  
pp. 1145-1147
Author(s):  
Yuki Nakamura ◽  
Tohru Okuzono ◽  
Akiko Toyotama ◽  
Junpei Yamanaka
Keyword(s):  
Colloidal Particles ◽  
Two Dimensional ◽  
Brownian Motions

A polymer chain in a solution of colloidal particles

1991 ◽  
Vol 33 (9) ◽  
pp. 1798-1808
Author(s):  
D.K. Klimov ◽  
A.R. Khokhlov
Keyword(s):  
Polymer Chain ◽  
Colloidal Particles

Polydisperse Colloids Two-Moment Diffusion Model Through Irreversible Thermodynamics Considerations

2020 ◽  
Vol 46 (1) ◽  
pp. 77-90
Author(s):  
Mohamed Bouzghaia ◽  
Ferhat Souidi ◽  
Zakaria Larbi
Keyword(s):  
Statistical Mechanics ◽  
Diffusion Model ◽  
Colloidal Particles ◽  
Numerical Models ◽  
Irreversible Thermodynamics ◽  
Diffusion Problem ◽  
Sedimentation Equilibrium ◽  
Size Spectrum ◽  
Size Segregation ◽  
Classical Size

Abstract This study deals with the problem of diffusion for polydisperse colloids. The resolution of this complex problem usually requires computationally expensive numerical models. By considering the number of colloidal particles and their mass as independent variables, the equations of state for a dilute polydisperse colloid are derived on a statistical mechanics basis. Irreversible thermodynamics is then applied to obtain a simple two-moment diffusion model. The validity of the model is illustrated by comparing its results with those obtained by a classical size spectrum approach, in a sedimentation equilibrium problem and in an unsteady one-dimensional diffusion problem in Stokes–Einstein regime, and under the hypothesis that the size spectrum distribution is stochastic. In the first problem, the two-moment diffusion problem allows to represent rigorously the vertical size segregation induced by gravity, while in the second one, it allows a convenient description of the diffusion of polydisperse colloids by using two coupled diffusion equations, with an accuracy comparable with that of the classical size spectrum approach. The contribution of our work lies primarily in the application of a non-equilibrium thermodynamics methodology to a challenging issue of colloid modeling, namely, polydispersity, by going from statistical mechanics to the derivation of phenomenological coefficients, with the two-moment approach as a guideline.

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