Formation of micro- and nano-spheric particles (filter dust) during the preparation of cellulose acetate membranes

Eckelt, John; Loske, Stefan; Gonçalves, Maria do Carmo; Wolf, Bernhard

doi:10.1016/s0376-7388(02)00454-4

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…Similar results were observed with the studied system (data not shown) [26]. The more detailed report deals with the preparation of cellulose acetate membrane using methyl acetate as solvent and 2-propanol as precipitant [24]. The authors demonstrated that the so-called filter dust produced during the membrane fabrication consisted of chains with a lower molecular weight than those in the dope solution.…”

Section: Surface Skin and Pinholessupporting

confidence: 78%

“…This assumption is supported by several studies found in literature that were reported on the formation of polymer nodules during LIPS (see for instance [23][24][25]). Their occurrence and that of large surface pores, also, are directly related to the dope solution viscosity controlled by either the polymer molecular weight [24] or the polymer concentration [24,25]. Similar results were observed with the studied system (data not shown) [26].…”

Section: Surface Skin and Pinholessupporting

confidence: 78%

See 1 more Smart Citation

A top surface liquid layer during membrane formation using vapor-induced phase separation (VIPS)—Evidence and mechanism of formation

Menut

Chinpa

et al. 2008

Journal of Membrane Science

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Section: Surface Skin and Pinholessupporting

confidence: 78%

Section: Surface Skin and Pinholessupporting

confidence: 78%

A top surface liquid layer during membrane formation using vapor-induced phase separation (VIPS)—Evidence and mechanism of formation

Menut

Chinpa

et al. 2008

Journal of Membrane Science

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“…The melting transitions suggest that two crystalline forms could be present, which apparently, reflected the presence of different sizes of polymer chains that could be fractionated during the drycasting process, 20 such as was observed before for CA/2propanol/methyl acetate system. 21 The transition at 2298C was coincident to the T m observed for the transparent films. Equivalent thermal transitions were observed on the TMA curve for the opaque CA films.…”

Section: Thermal Analysissupporting

confidence: 56%

Poly(caprolactone triol) as plasticizer agent for cellulose acetate films: influence of the preparation procedure and plasticizer content on the physico‐chemical properties

Meier

Κanis

Lima

et al. 2004

Polymers for Advanced Techs

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The influence of the plasticizer content and film preparation procedure on the morphology, density, thermal and mechanical properties of cellulose acetate (CA) films plasticized with poly-(caprolactone triol) (PCL-T), were studied. Differential scanning calorimetry (DSC), thermal mechanical analysis (TMA), scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD) and infrared spectroscopy (FT-IR) techniques were used. The films were prepared by dry-casting CA and CA/PCL-T in acetone or acetone/water solutions, which produced transparent and opaque films, respectively. In contrast to the transparent films, which were dense, the opaque films presented a porous morphology. However, the presence of PCL-T reduced the opaque film porosity, increasing, in consequence, its bulk density. The TMA results revealed that PCL-T reduced the glass transition temperature more significantly in the transparent than in opaque films. Only the transparent CA/PCL-T films presented a melting temperature, that reduced with higher concentrations of PCL-T, suggesting a higher ordering (crystallinity) when the films were prepared in the absence of water, as observed from WAXD curves. The mechanical properties also showed that the transparent films were more soft and tough than the opaque films. In summary, PCL-T was a good plasticizer agent for CA films due to the presence of hydrogen bonds between the components (FT-IR spectra). The presence of water in the dry casting process has a significant effect mainly on film morphology and mechanical properties.

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“…It was followed by precipitation under controlled evaporation by increasing temperature up to 60°C [22]. The skinned membranes were obtained [23][24][25] which were carefully removed from the glass plates by using a sharp knife. The thickness of the resulting membranes was measured to be in the range of 0.05-0.2 mm.…”

Section: Casting Of Membranesmentioning

confidence: 99%

Synthesis, characterization and permeation performance of cellulose acetate/polyethylene glycol-600 membranes loaded with silver particles for ultra low pressure reverse osmosis

Gul

Ahmad

Khan

et al. 2015

Journal of the Taiwan Institute of Chemical Engineers

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Formation of micro- and nano-spheric particles (filter dust) during the preparation of cellulose acetate membranes

Cited by 15 publications

References 9 publications

A top surface liquid layer during membrane formation using vapor-induced phase separation (VIPS)—Evidence and mechanism of formation

A top surface liquid layer during membrane formation using vapor-induced phase separation (VIPS)—Evidence and mechanism of formation

Poly(caprolactone triol) as plasticizer agent for cellulose acetate films: influence of the preparation procedure and plasticizer content on the physico‐chemical properties

Synthesis, characterization and permeation performance of cellulose acetate/polyethylene glycol-600 membranes loaded with silver particles for ultra low pressure reverse osmosis

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