scholarly journals Phase behaviour of mixtures of polyethylene glycol and polypropylene glycol: Influence of hydrogen bond clusters on critical composition fluctuations

2003 ◽  
Vol 5 (15) ◽  
pp. 3202 ◽  
Author(s):  
Susanne Eckert-Kastner ◽  
Gerhard Meier ◽  
Ingo Alig
Keyword(s):  
Hydrogen Bond ◽  
Polyethylene Glycol ◽  
Phase Behaviour ◽  
Polypropylene Glycol ◽  
Critical Composition ◽  
Composition 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.

Isolation of bacteria able to grow on both polyethylene glycol (PEG) and polypropylene glycol (PPG) and their PEG/PPG dehydrogenases

2007 ◽  
Vol 73 (6) ◽  
pp. 1407-1413 ◽  
Author(s):  
Xiaoping Hu ◽  
Akira Fukutani ◽  
Xin Liu ◽  
Kazuhide Kimbara ◽  
Fusako Kawai
Keyword(s):  
Polyethylene Glycol ◽  
Polypropylene Glycol

Degradation of polyethylene glycols and polypropylene glycols in microcosms simulating a spill of produced water in shallow groundwater

2019 ◽  
Vol 21 (2) ◽  
pp. 256-268 ◽  
Author(s):  
Jessica D. Rogers ◽  
E. Michael Thurman ◽  
Imma Ferrer ◽  
James S. Rosenblum ◽  
Morgan V. Evans ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Groundwater Contamination ◽  
Produced Water ◽  
Degradation Products ◽  
Shallow Groundwater ◽  
Polyethylene Glycols ◽  
Polypropylene Glycol

Polyethylene glycol, polypropylene glycol, and their degradation products could be utilized to better characterize shallow groundwater contamination following a spill of produced water.

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