The investigation of solution thermodynamics for the polysufone—DMAC—water system

Li, Shuguang; Jiang, Chengzhang; Yuanqi, Zhang

doi:10.1016/0011-9164(87)87009-1

Cited by 31 publications

(6 citation statements)

References 7 publications

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“…Some phase diagrams were determined by Strathmann for polyamides in a number of solvent/nonsolvent mixtures (Nomex) [4,5]. For polyurethane in DMF/water mixtures, the liquid-liquid demixing gap was deter-mined by Koenhen et al [78] The phase behaviour of polysulfones and polyethersulfones in solvent/nonsolvent mixtures was studied by many groups [79][80][81][82][83][84][85]. Ternary phase diagrams for cellulose acetate have also been frequently published [86][87][88][89].…”

Section: Liquid-liquid Demixingmentioning

confidence: 99%

Phase separation processes in polymer solutions in relation to membrane formation

Witte

Dijkstra

Berg

et al. 1996

Journal of Membrane Science

1,237

595

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This review covers new experimental and theoretical physical research related to the formation of polymeric membranes by phase separation of a polymer solution, and to the morphology of these membranes. Two main phase separation processes for polymeric membrane formation are discussed: thermally induced phase separation and immersion precipitation. Special attention is paid to phase transitions like liquid-liquid demixing, crystallization, gelation, and vitrification, and their relation to membrane morphology. In addition, the mass transfer processes involved in immersion precipitation, and their influence on membrane morphology are discussed.

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Section: Liquid-liquid Demixingmentioning

confidence: 99%

Phase separation processes in polymer solutions in relation to membrane formation

Witte

Dijkstra

Berg

et al. 1996

Journal of Membrane Science

1,237

595

View full text Add to dashboard Cite

show abstract

“…T 1 is zero for no additive, and large value of T 1 indicates more thermodynamic instability leading to quick demixing. Flory–Huggins solvent polymer interaction parameter χ is calculated as

normalχ = \frac{V_{1}}{R_{g} T} {({δ_{t,}}_{italicsolvent} - {normalδ}_{t, additive})}^{2}

where, V 1 , R g , and T are the molar volume of the solvent, ideal gas constant, and casting temperature.…”

Section: Methodsmentioning

confidence: 99%

“…T 1 is zero for no additive, and large value of T 1 indicates more thermodynamic instability leading to quick demixing. Flory-Huggins solvent polymer interaction parameter χ is calculated as [26] NOVEL HOLLOW FIBER NANOFILTRATION MEMBRANE wileyonlinelibrary.com/journal/pat…”

Section: Thermodynamic Enhancement In Ternary and Quaternary Polymer/mentioning

confidence: 99%

Preparation, characterization, and performance of a novel hollow fiber nanofiltration membrane

Mondal

2015

Polymers for Advanced Techs

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Nanofiltration (NF) grade hollow fiber membrane was prepared by incorporation of zinc chloride into polysulfone–polyethylene glycol (molecular weight 200) blend. A 1.0 wt% zinc chloride in the blend reduced the molecular weight cut off (MWCO) of hollow fibers from 44 kDa (average pore size 64A0) to a nanofiltration range of MWCO 870 Da (average pore size 7.69 A°). MWCO decreased further to 330 Da (average pore size 4.78 A°) on addition of 2.5 wt% zinc chloride. types of NF hollow fiber were spun, corresponding to zinc chloride concentration of 1.0, 1.5, 2.0, and 2.5 wt%. Ternary phase diagram qualitatively explained the denser morphology for various concentrations of zinc chloride. This was supported by scanning electron micrographs of cross‐section and top surface of hollow fibers. NF membranes possessed negative surface charge at extreme pH conditions. Rejection of 1000 mg/l sodium chloride solution was in between 38 to 45% at pH 11, and for divalent sodium sulfate, it was in the range of 55 to 62%. Rejection of dye congo red was found to be 100%. NF membranes showed reasonable antifouling characteristics having flux recovery ratio of more than 90% and a flux decline ratio of less than 10%. Copyright © 2015 John Wiley & Sons, Ltd.

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“…The degree of shi in binodal curve (DSBC) indicates the thermodynamic change of the casting solution due to the addition of additive. DSBC is estimated as follows: 66 DSBC ¼ MG w=o additive À MG w=additive MG w=o additive Â 100% (A1) Thus, the overall thermodynamic enhancement parameter, T, of the polymer due to the additive is quantied as 67 T ¼ DSBC Â c solvent/additive (A2)…”

Section: Appendix Amentioning

confidence: 99%

Characterization and antifouling properties of polyethylene glycol doped PAN–CAP blend membrane

Mondal

2015

RSC Adv.

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The investigation of solution thermodynamics for the polysufone—DMAC—water system

Cited by 31 publications

References 7 publications

Phase separation processes in polymer solutions in relation to membrane formation

Phase separation processes in polymer solutions in relation to membrane formation

Preparation, characterization, and performance of a novel hollow fiber nanofiltration membrane

Characterization and antifouling properties of polyethylene glycol doped PAN–CAP blend membrane

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