Hydrophobic and electrostatic interactions in the mixture hydrolyzed polyacrylamide–N-dodecylpyridinium chloride (AD37–DPC) in aqueous solution

2012 ◽  
Vol 40 (1) ◽  
pp. 269-279
Author(s):  
A. Mansri ◽  
B. Bouras ◽  
L. Tennouga ◽  
G. Clisson ◽  
B. Grassl
Keyword(s):  
Aqueous Solution ◽  
Electrostatic Interactions ◽  
Dodecylpyridinium Chloride ◽  
Hydrolyzed Polyacrylamide

Efficiency of Application of Hydrolyzed Polyacrylamide and Copolymer Acrylamide with Potassium Acrylate as a Water-Swelling Agent in Rubbers

2019 ◽  
Vol 816 ◽  
pp. 208-213
Author(s):  
Svetlana S. Lopatina ◽  
M.A. Vaniev ◽  
N.V. Sychev ◽  
D.A. Nilidin ◽  
Y.Yu. Savchenko ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Sodium Chloride ◽  
Carboxymethyl Cellulose ◽  
Sodium Carboxymethyl Cellulose ◽  
Butadiene Rubber ◽  
Swelling Ratio ◽  
Nitrile Butadiene Rubber ◽  
Swelling Agent ◽  
Water Swelling ◽  
Hydrolyzed Polyacrylamide

This paper reviews water swelling of rubber, based on nitrile-butadiene rubber, modified by polyacrylamide and copolymer acrylamide with potassium acrylate, also their combination with sodium-carboxymethyl cellulose. During the exposure for 14 days at a temperature of 67 °С swelling ratio in water is 200 % and 47 % in 10 % aqueous solution of sodium chloride.

Spectrophotometric investigation of the interactions between cationic (C.I. Basic Blue 9) and anionic (C.I. Acid Blue 25) dyes in adsorption onto extracted cellulose from Posidonia oceanic in single and binary system

2016 ◽  
Vol 73 (9) ◽  
pp. 2211-2221 ◽  
Author(s):  
Najoua Ben Douissa ◽  
Sonia Dridi-Dhaouadi ◽  
Mohamed Farouk Mhenni
Keyword(s):  
Aqueous Solution ◽  
Molecular Complex ◽  
Photoelectron Spectroscopy ◽  
Electrostatic Interactions ◽  
Equilibrium Concentration ◽  
Species Interaction ◽  
Spectrophotometric Analysis ◽  
Textile Dye ◽  
Acid Blue 25 ◽  
Acid Blue

Extracted cellulose from Posidonia oceanica was used as an adsorbent for removal of a cationic (Basic blue 9, BB) and anionic textile dye (Acid blue 25, AB) from aqueous solution in single dye system. Characterization of the extracted cellulose and extracted cellulose-dye systems were performed using several techniques such as Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, zeta potential and Boehm acid–base titration method. Adsorption tests showed that the extracted cellulose presented higher adsorption of BB than AB in single dye system, revealing that electrostatic interactions are responsible, in the first instance, for the dye–adsorbent interaction. In single dye systems, the extracted cellulose presented the maximum adsorption capacities of BB and AB at 0.955 mmol.g−1 and 0.370 mmol.g−1, respectively. Adsorption experiments of AB dye on extracted cellulose saturated by BB dye exhibited the release of the latter dye from the sorbent which lead to dye–dye interaction in aqueous solution due to electrostatic attraction between both species. Interaction of BB and AB dyes were investigated using spectrophotometric analysis and results demonstrated the formation of a molecular complex detected at wavelengths 510 and 705 nm when anionic (AB) and cationic (BB) dye were taken in equimolar proportions. The adsorption isotherm of AB, taking into account the dye–dye interaction was investigated and showed that BB dye was released proportionately by AB equilibrium concentration. It was also observed that AB adsorption is widely enhanced when the formation of the molecular complex is disadvantaged.

Voltage-responsive reversible self-assembly and controlled drug release of ferrocene-containing polymeric superamphiphiles

Soft Matter ◽  
2015 ◽  
Vol 11 (38) ◽  
pp. 7494-7501 ◽  
Author(s):  
Xueyi Chang ◽  
Zhiyu Cheng ◽  
Biye Ren ◽  
Renfeng Dong ◽  
Jun Peng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Drug Release ◽  
Acrylic Acid ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Controlled Drug Release ◽  
Poly Ethylene Glycol ◽  
Block Polymer ◽  
Poly Ethylene ◽  
Oppositely Charged

A voltage-responsive comb-like superamphiphilic block polymer PEG113-b-PAA30/FTMA was prepared based on the electrostatic interactions of a ferrocenyl surfactant (FTMA) and an oppositely charged poly-(ethylene glycol)-b-poly(acrylic acid) (PEG113-b-PAA30) in aqueous solution.

Enhanced Removal of Methylene Blue and Methyl Violet Dyes from Aqueous Solution Using a Nanocomposite of Hydrolyzed Polyacrylamide Grafted Xanthan Gum and Incorporated Nanosilica

2014 ◽  
Vol 6 (7) ◽  
pp. 4766-4777 ◽  
Author(s):  
Soumitra Ghorai ◽  
Asish Sarkar ◽  
Mohammad Raoufi ◽  
Asit Baran Panda ◽  
Holger Schönherr ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Xanthan Gum ◽  
Methyl Violet ◽  
Hydrolyzed Polyacrylamide

Peculiarities of electrostatic interactions between amino acids and salicylic acid in aqueous solution

BIOPHYSICS ◽  
2009 ◽  
Vol 54 (2) ◽  
pp. 139-142
Author(s):  
V. P. Barannikov ◽  
V. G. Badelin ◽  
M. B. Berezin
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Salicylic Acid ◽  
Electrostatic Interactions

scholarly journals Incorporation of Partially Hydrolyzed Polyacrylamide With Zwitterionic Units and Poly(Ethylene Glycol) Units Toward Enhanced Tolerances to High Salinity and High Temperature

2021 ◽  
Vol 8 ◽  
Author(s):  
Gang Lu ◽  
Jikuan Zhao ◽  
Shaoqi Li ◽  
Yuquan Chen ◽  
Chunfang Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Temperature ◽  
Normal Condition ◽  
Pure Water ◽  
Water Soluble ◽  
Water Soluble Polymer ◽  
Temperature Resistance ◽  
Partially Hydrolyzed Polyacrylamide ◽  
Hydrolyzed Polyacrylamide ◽  
Harsh Condition

Partially hydrolyzed polyacrylamide (HPAM) was widely implemented to improve the rheological properties of displacing fluids, but the high temperature and salinity of the reservoir brine limited their applications. Herein, copolymers including HPAM, zwitterion-modified HPAM (z-HPAM), PEG-modified HPAM (p-HPAM), and zwitterion/PEG-modified HPAM (zp-HPAM) were prepared by free radical polymerization in an aqueous solution. The viscosity of these copolymers under different temperature and salinity was measured in aqueous solution. It is found that the viscosity of the HPAM under the harsh condition (90oC, 20 × 104 mg/L salinity) is only 9.6% of that value under the normal condition (25oC, pure water), while the z-HPAM can significantly improve salt resistance by the effects of salting-in effect and intermolecular electrostatic crosslinking, showing a viscosity retention of 22.9% under the harsh condition. The addition of PEG-containing monomer can strengthen hydrogen bonding between the polymer chains and form a sterically ordered structure with improved salinity and temperature resistance. The synergistic effect of zwitterion units and PEG units endows the zp-HPAM with good salinity and temperature resistance; thus, the sample viscosity under the harsh condition remains 170 mPa s, which retains 29% of the value under the normal condition. The enhanced rheology properties of the zp-HPAM under the harsh condition are significant for the enhanced oil recovery of water-soluble polymer flooding.

Phosphorane lifetime and stereo-electronic effects along the alkaline hydrolysis of phosphate esters

2016 ◽  
Vol 18 (27) ◽  
pp. 18255-18267 ◽  
Author(s):  
Eufrásia S. Pereira ◽  
Júlio C. S. Da Silva ◽  
Tiago A. S. Brandão ◽  
Willian R. Rocha
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solution ◽  
Alkaline Hydrolysis ◽  
Electrostatic Interactions ◽  
Phosphate Esters ◽  
Electronic Effects ◽  
Important Intermediate ◽  
Dynamics Simulations ◽  
Phosphate Diesters ◽  
Hydrolysis Of

Ab initio molecular dynamics simulations revealed that phosphorane, an important intermediate in the hydrolysis of phosphate diesters, has a lifetime of ∼1 ps in aqueous solution. QTAIM and EDA analyses along the reaction coordinate show that the hydrolysis reaction of phosphate esters is driven mainly by electrostatic interactions.

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