Surface modification of phenolphthalein poly(ether sulfone) ultrafiltration membranes by blending with acrylonitrile-based copolymer containing ionic groups for imparting surface electrical properties

Wang, Meng; Wu, Li–guang; Zheng, Xing-Cun; Mo, Jian-Xiong; Gao, Congjie

doi:10.1016/j.jcis.2006.03.042

Cited by 51 publications

(22 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The versatility of this material was verified in several studies by preparing pH-sensitive membranes from phenolphthalein poly(ether sulfone). In one approach, poly(methyl methacryate) brushes were grafted onto a membrane consisting of phenolphthalein poly(ether sulfone) and poly(acrylonitrile) membrane surface, yielding pH-sensitive membranes [70,71]. As another example of phenolphthalein-based materials, polymeric materials in which the molecule's pH sensitivity was kept intact were synthesized [72].…”

Section: Methodsmentioning

confidence: 99%

Polymers and Dyes: Developments and Applications

2015

View full text Add to dashboard Cite

Amongst functional macromolecules, the combination of polymers and dyes is a research field of great potential with regard to high-performance materials. Accordingly, colored polymers have become increasingly important as materials for miscellaneous technical applications in recent years while also being a major part of everyday life. For instance, dye-containing polymers are nowadays widely applied in medicine, painting industries, analytics and gas separation processes. Since these applications are obviously connected to the dye's nature, which is incorporated into the corresponding polymers, the affinity of certain polymers to dyes is exploited in wastewater work-ups after (textile) dyeing procedures. In this review, we wish to point out the great importance of dye-containing polymers, with a comprehensive scope and a focus on azo, triphenylmethane, indigoid, perylene and anthraquinone dyes. Since a large number of synthetic approaches towards the preparation of such materials can be found in the literature, an elaborated overview of different preparation techniques is given as well.

show abstract

Section: Methodsmentioning

confidence: 99%

Polymers and Dyes: Developments and Applications

2015

View full text Add to dashboard Cite

show abstract

“…Ignoring a membrane surface conductance causes decreasing reproducibility of measurement results, and also complicates determination of apparent zeta potential which depends on measurement cell design. In the literature, the effects of the surface/body conductance of polymeric and ceramic membranes on zeta potential were experimentally investigated, and the correct zeta potentials of membranes were determined by measurements at various heights of micro flow channel with the approaches that developed from the studies [15][16][17][18][19].…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Determination of correct zeta potential of polyether sulfone membranes using CLC and AGC: ionic environment effect

Salgın

Tuzlalı

2016

Desalination and Water Treatment

View full text Add to dashboard Cite

A B S T R A C TIn this study, the correct and apparent zeta potential of polyether sulfone (PES) ultrafiltration membranes at different ionic environments were determined using streaming potential measurements. The apparent zeta potential was found by calculation with classic Helmholtz-Smoluchowski (HS) and Fairbrother-Mastin (FM) equations of results obtained from clamping cell (CLC) and adjustable gap cell (AGC). Correct zeta potential was determined by calculation with a modified HS equation of obtained results from AGC. Obtained apparent zeta potential results from CLC and AGC differ from each other, and the reproducibility of results was found to be higher for measurements of AGC. Except for low pH values, apparent zeta potential that was obtained from classic HS equation with AGC could be accepted as correct zeta potential. In CLC measurements, underestimated or overestimated zeta potential values were determined in comparison with the correct zeta potential. The effect of membrane surface conductance on zeta potential decreased with increasing KCl concentration. In CLC, the deviation was observed from electrical double layer theory when KCl concentration was 0.1 M, therefore streaming potential measurements did not produce correct results at higher salt concentration. 0.001 M KCl concentration was the value at which surface conductance became crucial.

show abstract

“…Modified values of dielectric constants are compared at several frequencies covering the wide frequency band of 40 Hz to 14 MHz. The trait of polymer membrane as a dielectric material can be a crucial aspect particularly in separation of protein molecules because of the latter's inherent dipole moment [40].…”

Section: Measurement Of Dielectric Constantmentioning

confidence: 99%