scholarly journals Influence of Coagulation Bath Temperature on the Structure and Dielectric Properties of Porous Polyimide Films in Different Solvent Systems

ACS Omega ◽  
2020 ◽  
Vol 5 (46) ◽  
pp. 29889-29895
Author(s):  
Panpan Zhang ◽  
Ke Zhang ◽  
Xi Chen ◽  
Shuliang Dou ◽  
Jiupeng Zhao ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Polyimide Films ◽  
Solvent Systems ◽  
Coagulation Bath Temperature

scholarly journals Effect of Precipitation Temperature on the Properties of Cellulose Ultrafiltration Membranes Prepared via Immersion Precipitation with Ionic Liquid as Solvent

Membranes ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 87 ◽  
Author(s):  
Daria Nevstrueva ◽  
Arto Pihlajamäki ◽  
Juha Nikkola ◽  
Mika Mänttäri
Keyword(s):  
Ionic Liquid ◽  
Pure Water ◽  
Polymer Concentration ◽  
Water Flux ◽  
Bath Temperature ◽  
Liquid Solution ◽  
Coagulation Bath ◽  
Fouling Resistance ◽  
Ultrafiltration Membranes ◽  
Coagulation Bath Temperature

Supported cellulose ultrafiltration membranes are cast from a cellulose-ionic liquid solution by the immersion precipitation technique. The effects of coagulation bath temperature and polymer concentration in the casting solution on the membrane morphology, wettability, pure water flux, molecular weight cut-off, and fouling resistance are studied. Scanning electron microscopy, contact angle measurements, atomic force microscopy, and filtration experiments are carried out in order to characterise the obtained ultrafiltration cellulose membranes. The results show the effect of coagulation bath temperature and polymer concentration on the surface morphology and properties of cellulose ultrafiltration membranes. Optimisation of the two parameters leads to the creation of dense membranes with good pure water fluxes and proven fouling resistance towards humic acid water solutions.

scholarly journals Temperature Coagulant Tub Variation Effect on the Characteristic of Hollow Fiber Dialyser from Cellulose Acetate Composite D-Glucose Monohydrate

2017 ◽  
Vol 31 ◽  
pp. 53-60
Author(s):  
Rizki Firsta Wahyuliswari ◽  
Siswanto ◽  
Prihartini Widiyanti
Keyword(s):  
Tensile Strength ◽  
Creatinine Clearance ◽  
Cellulose Acetate ◽  
Hollow Fiber ◽  
Bath Temperature ◽  
Hollow Fibers ◽  
Coagulation Bath ◽  
Temperature Variations ◽  
Swelling Rate ◽  
Coagulation Bath Temperature

Polysulfone is synthetic polymer widely used as basic material for dialyzer membrane and hydrophobic so it tends to cause fouling. Cellulose acetate is non-synthetic, hydrophilic polymer which has low tendency of fouling and has good thermal stability and permeability so it is considered as alternative material for hollow fiber dialyzer. A proper hollow fiber can be achieved by setting a proper temperature of coagulation bath along the spinning process. This research aims to understand the effect of coagulation bath temperature variations on the physical characteristic such as pore size, tensile strength, swelling rate and creatinine clearance of cellulose acetate – D-glucose monohydrate hollow fibers. Hollow fibers were fabricated using spinneret at temperature variations 5°C, 10°C, 15°C dan 20°C. Physical characteristics were estimated by doing morphology test using SEM, tensile test, swelling test towards Simulated Body Fluid (SBF) and filtration test towards creatinine. Result revealed that the hollow fibers from 5°C coagulation bath temperature gives the best characteristic and performance with tensile strength 27,421 N mm-2, pore size 0,0295–0,0858 nm, swelling rate 4,18%, elongation rate 4,4 %, flux rate 1,6032–1,7956 mL cm-2 min-1 and creatinine clearance rate 40,14–48,30% so it is potential to be applied as dialyzer membrane.

scholarly journals Effect of coagulation bath temperature during preparation of PES hollow fiber supported liquid membrane for acetic acid removal

2017 ◽  
Vol 19 ◽  
pp. 118 ◽  
Author(s):  
Sathiya Sanmugam ◽  
Norlisa Harruddin ◽  
Syed M Saufi
Keyword(s):  
Aqueous Solution ◽  
Acetic Acid ◽  
Hollow Fiber ◽  
Liquid Membrane ◽  
Hollow Fiber Membrane ◽  
Bath Temperature ◽  
Supported Liquid Membrane ◽  
Coagulation Bath ◽  
Fiber Membrane ◽  
Coagulation Bath Temperature

<p>Acetic acid is a byproduct of acid hydrolysis of biomass during sugar recovery step in biofuel production. Acetic acid can inhibit the enzyme used during fermentation of sugar to the ethanol. Hollow fiber supported liquid membrane (SLM) was used in this study to remove acetic acid from aqueous solution. Liquid membrane was formulated using trioctylamine and 2-ethyl hexanol as a carrier and solvent, respectively. The hollow fiber membrane support was prepared from 15 wt.% polyethersulfone, 42.5 wt.% polyethyleneglycol 200 and 42.5 wt.% dimethylacetamide. The effect of coagulation bath temperature (CBT) at 30<sup>º</sup>C, 40<sup>º</sup>C and 50<sup>º</sup>C during hollow fiber membrane spinning process was investigated. The porosity of the membrane increased as the CBT increased. The porosity of the membrane prepared using CBT of 30ºC, 40<sup>º</sup>C and 50<sup>º</sup>C were 35.7%, 46.7% and 61.6%, respectively. SLM process using hollow fiber membrane prepared at 50ºC of coagulation bath was able to remove 52% of acetic acid from the aqueous solution.</p><p>Chemical Engineering Research Bulletin 19(2017) 118-122</p>

Preparation and Characterization of H-PAN Grafted PEG Phase Change Fibers

2011 ◽  
Vol 317-319 ◽  
pp. 2351-2355
Author(s):  
Jing Guo ◽  
Lei Xu ◽  
Dan Li ◽  
Xin Liu
Keyword(s):  
Phase Change ◽  
Raw Materials ◽  
Crosslinking Agent ◽  
Bath Temperature ◽  
Solution Concentration ◽  
Coagulation Bath ◽  
Solidification Temperature ◽  
Spinning Process ◽  
Crosslinker Concentration ◽  
Coagulation Bath Temperature

Using waste polyacrylonitrile fibers as raw materials. After the polyacrylonitrile fibers was hydrolyzed by NaOH and was grafted by PEG, H-PAN grafted PEG phase change fibers were prepared by wet spinning . The spinning process of the phase change fibers was observed, and the best spinning process was determined. Discussed the mechanical properties of the phase change fibers on the spinning solution concentration, crosslinker concentration, coagulation bath concentration and coagulation bath temperature. Temperature adaptable and durability properties of phase change fibers were characterizated by step cooling curves. The results showed that the best spinning process of the phase change fibers was the spinning solution concentration 20%, crosslinking agent concentration 4%, the concentration of coagulation bath 90%, the solidification temperature 30°C. The phase change fibers had good temperature adaptable property and temperature adaptable durability.

scholarly journals Polymer Concentration and Solvent Variation Correlation with the Morphology and Water Filtration Analysis of Polyether Sulfone Microfiltration Membrane

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Muhammad Azeem U. R. Alvi ◽  
Muhammad Waqas Khalid ◽  
Nasir M. Ahmad ◽  
Muhammad Bilal K. Niazi ◽  
Muhammad Nabeel Anwar ◽  
...  
Keyword(s):  
Polymer Concentration ◽  
Water Flux ◽  
Bath Temperature ◽  
Membrane Resistance ◽  
Precipitation Method ◽  
Coagulation Bath ◽  
Membrane Formation ◽  
Polyether Sulfone ◽  
Subsequent Effect ◽  
Coagulation Bath Temperature

Microfiltration flat sheet membranes of polyether sulfone (PES) were fabricated by incorporating varying concentrations of polymer and investigated the influence of substituting solvents. The membranes were prepared via immersion precipitation method. Different solvents that included NMP (N-methyl-2-pyrrolidone), DMF (dimethylformamide), and THF (tetrahydrofuran) were used to analyse their effect on the performance and morphology of the prepared membranes. Two different coagulation bath temperatures were used to investigate the kinetics of membrane formation and subsequent effect on membrane performance. The maximum water flux of 141 ml/cm2.h was observed using 21% of PES concentration in NMP + THF cosolvent system. The highest tensile strength of 29.15 MPa was observed using membrane prepared with 21% PES concentration in NMP as solvent and coagulation bath temperature of 25°C. The highest hydraulic membrane resistance was reported for membrane prepared with 21% PES concentration in NMP as solvent. Moreover, the lowest contact angle of 67° was observed for membrane prepared with 15% of PES concentration in NMP as solvent with coagulation bath temperature of 28°C. Furthermore, the Hansen solubility parameter was used to study the effect on the thermodynamics of membrane formation and found to be in good correlation with experimental observation and approach in the present work.

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