Transformation of the Supermolecular Structure of Surface Layers in Composite Polysulfone and Polyethersulfone Ultrafiltation Membranes
Russian Journal of Physical Chemistry A, ISSN: 1531-863X, Vol: 95, Issue: 10, Page: 2125-2131
2021
- 3Citations
- 2Captures
Metric Options: Counts1 Year3 YearSelecting the 1-year or 3-year option will change the metrics count to percentiles, illustrating how an article or review compares to other articles or reviews within the selected time period in the same journal. Selecting the 1-year option compares the metrics against other articles/reviews that were also published in the same calendar year. Selecting the 3-year option compares the metrics against other articles/reviews that were also published in the same calendar year plus the two years prior.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
Abstract: Results are presented from studying active and drainage layers of composite ultrafiltration polysulfone and polyethersulfone membranes via thermogravimetry (TG), differential scanning calometry (DSC), and X-ray diffraction analysis in the air-dried state and after exposure to transmembrane pressure and permeate diffusion. It is found that thermal effects of polymer layers are observed on the TG and DSC curves of the composite membrane samples. The thermal properties of Lavsan (PET) are apparent in the temperature range of 32 to 240°C; those of polysulfones, from 240 to 450°C. Deconvolution of endothermic peaks shows that the peak at T = 64.1°C correlates with glass transition temperature; the peak at T = 188.4°C, with the melting of PET crystallites according to the empirical rule of two thirds: T ≈ 2/3T. Degradation of both PET and polysulfone macromolecules starts at T = 450°С. It is shown that transmembrane pressure and the diffusion of water alter the chemical composition of Lavsan in ~50% of its mass as a result of hydrolysis. X‑ray diffraction measurements of the active membrane layer at 2θ ≈ 17.5° confirms the amorphous structure of polysulfones. The shift of the diffraction angle toward large angles 2θ ≈ 19.24° for PS indicates an increase in the packing density of macromolecules in amorphous formations of the working sample. It is concluded that the density of packing falls for polyethersulfone at 2θ ≈ 17.34°.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85116228157&origin=inward; http://dx.doi.org/10.1134/s0036024421100150; https://link.springer.com/10.1134/S0036024421100150; https://link.springer.com/content/pdf/10.1134/S0036024421100150.pdf; https://link.springer.com/article/10.1134/S0036024421100150/fulltext.html; https://dx.doi.org/10.1134/s0036024421100150; https://link.springer.com/article/10.1134/S0036024421100150
Pleiades Publishing Ltd
Provide Feedback
Have ideas for a new metric? Would you like to see something else here?Let us know