Structure and permeability of fluoroplastic membranes cast from polymer-solvent-precipitator ternary systems

Bildyukevich, A. V.; Ermolinskaya, T. M.; Fen’ko, L. A.

doi:10.1134/s0965545x07110107

Cited by 2 publications

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“…On the other hand, molecular weights which are too high have been shown to lead to higher strength membranes with lower membrane porosity and water fl ux, [ 28 ] larger pore sizes at the surface, [ 29 ] higher permeability, and lower selectivity. [ 30,31 ] Optimal molecular weights therefore appear to be in the 20 000 to 40 000 g mol −1 range. [ 29,30 ] However, it is easier to decrease the molecular weight of a selected polymer batch in AABB polycondensations by adding a predetermined amount of one of the two monomers than to have to change the synthetic method due to its intrinsic limitations.…”

Section: Optimization Of the Synthesis Of Poly(4ees-alt-cb) And Poly(mentioning

confidence: 99%

“…[ 30,31 ] Optimal molecular weights therefore appear to be in the 20 000 to 40 000 g mol −1 range. [ 29,30 ] However, it is easier to decrease the molecular weight of a selected polymer batch in AABB polycondensations by adding a predetermined amount of one of the two monomers than to have to change the synthetic method due to its intrinsic limitations.…”

Section: Optimization Of the Synthesis Of Poly(4ees-alt-cb) And Poly(mentioning

confidence: 99%

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Synthesis of High Molecular Weight Polyetherethersulfone‐Allyl Copolymers of Controlled Glass Transition

Faye

Fürtös

Brisson

2016

Macro Chemistry & Physics

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Polyetherethersulfones with double bonds inserted along the main polymer chain are synthesized by polycondensation. The glass transition is modulated by increasing the size of aromatic etherethersulfone rigid blocks and decreasing the ratio of flexible allyl segments which contain a double bond. Resulting copolymers have a Mn of up to 60 000 g mol−1, moderate polydispersity indices (Đ or Ip) of 1.70 to 2.11, and are shown, by the presence of a single glass transition temperature in differential scanning calorimetry and by matrix‐assisted laser desorption/ionization time‐of‐flight (MALDI‐TOF) mass spectrometry, to be random. The glass transition of copolymers follows the Gordon–Taylor relationship. The thermal resistance of copolymers increases when decreasing the amount of the flexible segment and increasing the length of the rigid block. Chemical aging of films is investigated by immersion in bleach, which is commonly used to clean membranes. Films show high resistance to bleach, therefore making this approach relevant to membrane fabrication.

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Section: Optimization Of the Synthesis Of Poly(4ees-alt-cb) And Poly(mentioning

confidence: 99%

Section: Optimization Of the Synthesis Of Poly(4ees-alt-cb) And Poly(mentioning

confidence: 99%

Synthesis of High Molecular Weight Polyetherethersulfone‐Allyl Copolymers of Controlled Glass Transition

Faye

Fürtös

Brisson

2016

Macro Chemistry & Physics

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show abstract

Thermal and X-Ray Structural Studies of Structural Changes in the Active Layer of Polytetrafluoroethylene Ultrafiltration Membranes

et al. 2021

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Structure and permeability of fluoroplastic membranes cast from polymer-solvent-precipitator ternary systems

Cited by 2 publications

References 4 publications

Synthesis of High Molecular Weight Polyetherethersulfone‐Allyl Copolymers of Controlled Glass Transition

Synthesis of High Molecular Weight Polyetherethersulfone‐Allyl Copolymers of Controlled Glass Transition

Thermal and X-Ray Structural Studies of Structural Changes in the Active Layer of Polytetrafluoroethylene Ultrafiltration Membranes

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