Critical fluctuations in a binary mixture of polyethylene glycol and polypropylene glycol studied by ultrasonic and light scattering experiments

1997 ◽  
Vol 55 (3) ◽  
pp. 3102-3110 ◽  
Author(s):  
W. Mayer ◽  
S. Hoffmann ◽  
G. Meier ◽  
I. Alig
Keyword(s):  
Polyethylene Glycol ◽  
Light Scattering ◽  
Binary Mixture ◽  
Polypropylene Glycol ◽  
Critical Fluctuations

scholarly journals Development of Antifouling Polysulfone Membranes by Synergistic Modification with Two Different Additives in Casting Solution and Coagulation Bath: Synperonic F108 and Polyacrylic Acid

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 359
Author(s):  
Katsiaryna S. Burts ◽  
Tatiana V. Plisko ◽  
Mikael Sjölin ◽  
Goncalo Rodrigues ◽  
Alexandr V. Bildyukevich ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Polyacrylic Acid ◽  
Process Water ◽  
Coagulation Bath ◽  
Interpolymer Complex ◽  
Polypropylene Glycol ◽  
Layer Surface ◽  
Membrane Modification ◽  
Selective Layer ◽  
Casting Solution

This study deals with the development of antifouling ultrafiltration membranes based on polysulfone (PSF) for wastewater treatment and the concentration and purification of hemicellulose and lignin in the pulp and paper industry. The efficient simple and reproducible technique of PSF membrane modification to increase antifouling performance by simultaneous addition of triblock copolymer polyethylene glycol-polypropylene glycol-polyethylene glycol (Synperonic F108, Mn =14 × 103 g mol−1) to the casting solution and addition of polyacrylic acid (PAA, Mn = 250 × 103 g mol−1) to the coagulation bath is proposed for the first time. The effect of the PAA concentration in the aqueous solution on the PSF/Synperonic F108 membrane structure, surface characteristics, performance, and antifouling stability was investigated. PAA concentrations were varied from 0.35 to 2.0 wt.%. Membrane composition, structure, and topology were investigated by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and scanning electron microscopy (SEM). The addition of PAA into the coagulation bath was revealed to cause the formation of a thicker and denser selective layer with decreasing its pore size and porosity; according to the structural characterization, an interpolymer complex of the two additives was formed on the surface of the PSF membrane. Hydrophilicity of the membrane selective layer surface was shown to increase significantly. The selective layer surface charge was found to become more negative in comparison to the reference membrane. It was shown that PSF/Synperonic F108/PAA membranes are characterized by better antifouling performance in ultrafiltration of humic acid solution and thermomechanical pulp mill (ThMP) process water. Membrane modification with PAA results in higher ThMP process water flux, fouling recovery ratio, and hemicellulose and total lignin rejection compared to the reference PSF/Synperonic F108 membrane. This suggests the possibility of applying the developed membranes for hemicellulose concentration and purification.

Self-Assemble Behavior of Amphiphilic Diblock Copolymer of Methoxy Poly (Ethylene Glycol)/Polyester

2011 ◽  
Vol 295-297 ◽  
pp. 11-15
Author(s):  
Hao Zhou ◽  
Qing Hong Liang ◽  
Xiang Ke Shi ◽  
Li Hua Lu ◽  
Li Qun Zhang ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Light Scattering ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Average Diameter ◽  
Core Shell ◽  
Amphiphilic Diblock Copolymer ◽  
Amphiphilic Diblock Copolymers ◽  
Methoxy Polyethylene Glycol ◽  
Solution Polycondensation

Amphiphilic diblock copolymers based on methoxy polyethylene glycol (MePEG), 1, 6-hexanediol and maleic anhydride with different molar composition were synthesized by solution polycondensation. Self-assemble behavior of amphiphilic diblock copolymer in different solvents by dialyzing technique was discussed. The micelle morphologhy was observed by TEM. It was found that well core-shell MePEG1900/Polyester 2162 copolymer nanoparticles can be formed by self-assemble in acetone solution. In addition, the size of nanospheres measured using dynamic light scattering exhibited a narrow monodisphere size distribution and an average diameter in the ranger of less than 200nm.

Dynamics of critical fluctuations in a binary mixture of limited miscibility under a strong electric field

2000 ◽  
Vol 61 (1) ◽  
pp. 960-963 ◽  
Author(s):  
Sylwester J. Rzoska ◽  
Aleksandra Drozd-Rzoska ◽  
Jerzy Zioło
Keyword(s):  
Binary Mixture ◽  
Electric Field ◽  
Strong Electric Field ◽  
Critical Fluctuations

Light scattering from a binary mixture with internal relaxation

1973 ◽  
Vol 1 (5) ◽  
pp. 447-456 ◽  
Author(s):  
J.W.H. Sutherland ◽  
J.M. Deutch
Keyword(s):  
Light Scattering ◽  
Binary Mixture
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