Rheological investigation of aqueous solutions of poly(vinyl alcohol) during aging II. Influence of experimental conditions on dissolution and aging

1987 ◽  
Vol 265 (3) ◽  
pp. 234-238 ◽  
Author(s):  
P. Štern ◽  
E. Prokopová ◽  
Q. Quadrat
Keyword(s):  
Aqueous Solutions ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Experimental Conditions

scholarly journals Use of Poly(vinyl alcohol)-Malic Acid (CLHPMA) Hydrogels and Chitosan Coated Calcium Alginate (CCCA) Microparticles as Potential Sorbent Phases for the Extraction and Quantitative Determination of Pesticides from Aqueous Solutions

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3993
Author(s):  
Cristian Valdés ◽  
Oscar Valdés ◽  
Daniel Bustos ◽  
Diana Abril ◽  
Gustavo Cabrera-Barjas ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Malic Acid ◽  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Crop Yields ◽  
Poly Vinyl Alcohol ◽  
Mechanical Agitation ◽  
Experimental Conditions ◽  
Desorption Process

Pesticides are used worldwide to increase crop yields in agriculture. However, their toxicity and accumulation capacity can make them toxic to the environment, animals and humans. In the case of workers chronically exposed to these substances, they must be sampled continuously, so urine is an excellent option. In this sense, this study proposes to use poly(vinyl alcohol)-malic acid hydrogels, and chitosan-coated calcium alginate as new sorbent phases to be used in pesticide determination processes in urine. To better understand the behavior of these materials in the capture and desorption process, molecular dynamics simulations (MDS) were used, and desorption experiments were performed, using mechanical agitation, ultrasound, and pH variation in the desorption process, in order to optimize the parameters to obtain better recoveries. Under the optimal experimental conditions, the maximum recoveries were of the order of 11% (CFN), 3% (KCF), 53% (DMT), 18% (MTD) and 35% (MTL). Although the recoveries were not exhaustive, they are a first approximation for the use of these new sorbent phases in the determination of this type of compound in aqueous solutions and urine.

Flow-induced crystalline precursors in entangled Poly(vinyl alcohol) aqueous solutions

Polymer ◽  
2021 ◽  
pp. 123960
Author(s):  
Chang Liu ◽  
Xinhong Yu ◽  
Yinghan Li ◽  
Xinyue Zhao ◽  
Quan Chen ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

Conformational changes in poly(vinyl alcohol)-graft-polyacrylamide in aqueous solutions vs graft content

2003 ◽  
Vol 203 (1) ◽  
pp. 201-206 ◽  
Author(s):  
Nataliya Kutsevol ◽  
Tatyana Zheltonozhskaya ◽  
Nataliya Melnik ◽  
Jean-Michel Guenet ◽  
Vladimir Syromyatnikov
Keyword(s):  
Aqueous Solutions ◽  
Conformational Changes ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

The role of electrostatic repulsion in the gelation of poly(vinyl alcohol)/borax aqueous solutions

Soft Matter ◽  
2018 ◽  
Vol 14 (32) ◽  
pp. 6767-6773 ◽  
Author(s):  
Jingjing Li ◽  
Zhijie Zhang ◽  
Xiao Cao ◽  
Yonggang Liu ◽  
Quan Chen
Keyword(s):  
Aqueous Solutions ◽  
Vinyl Alcohol ◽  
Linear Viscoelasticity ◽  
Poly Vinyl Alcohol ◽  
Electrostatic Repulsion

This study examined linear viscoelasticity of semidilute non-entangled poly(vinyl alcohol) (PVA) and borax aqueous solutions: one borax molecule dissociates into two B(OH)3 molecules and two B(OH)4− ions, and the latter can crosslink the PVA chains.

Study of cryostructurization of polymer systems VII. Structure formation under freezing of poly(vinyl alcohol) aqueous solutions

1986 ◽  
Vol 264 (1) ◽  
pp. 19-24 ◽  
Author(s):  
V. I. Lozinsky ◽  
E. S. Vainerman ◽  
L. V. Domotenko ◽  
A. M. Mamtsis ◽  
E. F. Titova ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Structure Formation ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Polymer Systems
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