Viscosimetric properties of the concentrated polymer solutions. II. Dependence of the non-Newtonian viscosity on the thermodynamic quality of the solvent and on its viscosity

1972 ◽  
Vol 37 (9) ◽  
pp. 3039-3041 ◽  
Author(s):  
O. Quadrat
Keyword(s):  
Polymer Solutions ◽  
Newtonian Viscosity ◽  
Thermodynamic Quality

scholarly journals Study of the formation of structures in solutions of chitosan – polyvinyl alcohol polymer blends

2021 ◽  
Vol 23 (2) ◽  
pp. 188-195
Author(s):  
Rinat M. Akhmetkhanov ◽  
Valentina V. Chernova ◽  
Angela S. Shurshina ◽  
Mariya Yu. Lazdina ◽  
Elena I. Kulish
Keyword(s):  
Polyvinyl Alcohol ◽  
Polymer Blends ◽  
Intrinsic Viscosity ◽  
Solvent Interaction ◽  
Polymer Aggregates ◽  
Macromolecular Coil ◽  
Aggregation Processes ◽  
Huggins Constant ◽  
Thermodynamic Quality

The aim of this work was the investigation of the formation of structures in solutions of individual polymers, as well as their blends with each other in buffer solvents with different values of pH. In this study we used a sample of chitosan (degree of deacetylation ~ 84 %, M = 130,000), which is a polycation when dissolved, and polyvinyl alcohol (r = 1.25 g/cm3, M = 5000). Buffer systems based on acetic acid and sodium acetate with pH = 3.8, 4.25, and 4.75 were used as solvents. Viscosimetry was used to determine the intrinsic viscosity, the degree of structuring, and the Huggins constant. The Kriegbaum method was used to determine the nature of the aggregates formed by the blend of the studied polymers. In the course of the research, it was shown that an increase in the pH of the acetate buffer used as a solvent was accompanied by a compression of the macromolecular coil (a decrease in intrinsic viscosity values), a deterioration in the quality of thesolvent (an increase in Huggins constant values), and an increase in the degree of polymer aggregation in a solution for chitosan polyelectrolyte. At the same time for a solution of polyvinyl alcohol the pH of the buffer practically did not affect the nature of the polymer-solvent interaction. It has been proved that polymer blends are characterized by an increase in aggregation processes and a decrease in the thermodynamic quality of the solvent in comparison with solutions of individual polymers. The size of the “combined” macromolecular coil, characterized by the intrinsic viscosity value for the polymer blend, which can be both above (buffer solvent with pH = 3.80) and below (buffer solvent with pH = 4.25 and 4.75) additivevalues, changed depending on the type of formed polymer-polymer aggregates (homo- or hetero-). It was established that the type of aggregates (homo- or hetero-) formed in solutions of polymer blends was determined not only by the thermodynamic quality of the used solvents, but also by the concentration of the polymers in the initial solutions

scholarly journals Physico-chemical Investigation of Aqueous Polymer Solutions and their Application as Soft Medicinal Forms

2019 ◽  
Vol 35 (2) ◽  
pp. 637-642
Author(s):  
Nagima Dzhakipbekova ◽  
Botagoz Torlanova ◽  
Erzhan Dzhakipbekov ◽  
Laura Aykozova ◽  
Asel Bekmurzaeva ◽  
...  
Keyword(s):  
Polymer Solutions ◽  
Water Soluble ◽  
Chemical Investigation ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Technological Processes ◽  
Aqueous Polymer ◽  
Physico Chemical ◽  
Productivity Increase

The growing demand for water-soluble polymers of the acrylic series causes the researchers' interest in the synthesis of these compounds, which ultimately allows solving the tasks of the productivity increase, finding ways to improve the quality of final products, developing new highly efficient technological processes for the synthesis of these substances and their application as soft medicinal forms.

The upturn effect in the non-Newtonian viscosity of polymer solutions

Polymer ◽  
1965 ◽  
Vol 6 (1) ◽  
pp. 35-47 ◽  
Author(s):  
S.P. Burow ◽  
A. Peterlin ◽  
D.T. Turner
Keyword(s):  
Polymer Solutions ◽  
Newtonian Viscosity

Prediction of the non-Newtonian viscosity and shear stability of polymer solutions

1988 ◽  
Vol 266 (9) ◽  
pp. 793-805 ◽  
Author(s):  
M. Bouldin ◽  
W. -M. Kulicke ◽  
H. Kehler
Keyword(s):  
Polymer Solutions ◽  
Newtonian Viscosity ◽  
Shear Stability
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