Preparation and Characterization of Novel Hollow Fiber Membrane with Multicomponent Polymeric Materials

2012 ◽  
Vol 534 ◽  
pp. 8-12 ◽  
Author(s):  
Yun Qing Li ◽  
Dan Li Xi ◽  
Shun Li Fan
Keyword(s):  
Vinylidene Fluoride ◽  
Hollow Fiber Membrane ◽  
Polymeric Materials ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Cross Sectional ◽  
Poly Vinyl Chloride ◽  
Poly Vinylidene Fluoride ◽  
Coagulation Bath Temperature

Poly(vinylidene fluoride)(PVDF), poly(vinyl chloride)(PVC), and poly(methyl methacrylate)(PMMA) were used as the main materials in the preparation of novel blend five-hole membrane. Dimethylacetamide (DMAC) and polyvinyl pyrrolidone (PVP) were used as solvent and additive, respectively. The effect of some external coagulation conditions on the property of five-hole membrane was studied. The external coagulation conditions investigated in the work were the coagulation temperature and the DMAC content in coagulation bath. The result showed that the flux increased along with the increase of coagulation bath temperature and could reach the max at 35°C, then decreased gradually. The effect of the DMAC content in coagulation bath on flux is very similar to that of the temperature. The cross-sectional structures were examined by scanning electron microscopy.

Effect of coagulation bath temperature on formation mechanism of poly(vinylidene fluoride) membrane

2008 ◽  
Vol 110 (3) ◽  
pp. 1656-1663 ◽  
Author(s):  
Xuyun Wang ◽  
Lin Zhang ◽  
Dahai Sun ◽  
Quanfu An ◽  
Huanlin Chen
Keyword(s):  
Formation Mechanism ◽  
Vinylidene Fluoride ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Poly Vinylidene Fluoride ◽  
Coagulation Bath Temperature

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>

scholarly journals Diffusion Coefficients of Dimethyl Sulphoxide (DMSO) and H2O in PAN Wet Spinning and Its Influence on Morphology of Nascent Polyacrylonitrile (PAN) Fiber

2013 ◽  
Vol 8 (1) ◽  
pp. 155892501300800 ◽  
Author(s):  
Kai Yi ◽  
Qi Fang Li ◽  
Li Zhang ◽  
Ning Li ◽  
You Zhou ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Diffusion Coefficients ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Diffusion Activation Energy ◽  
Cross Sectional ◽  
Pan Fiber ◽  
Different Temperatures ◽  
Nascent Fiber ◽  
Coagulation Bath Temperature

Wetspun nascent PAN fibers were immersed into a DMSO/H2O coagulation bath. Diffusion of DMSO from nascent fiber and that of H2O into nascent fiber were studied at different temperatures and concentrations of coagulation bath. The diffusion coefficient of H2O is larger than that of DMSO. As the coagulation bath temperature increased, the diffusion coefficients of DMSO and H2O increased. Diffusion activation energy of DMSO is smaller than that of H2O during the diffusion. Cross sectional and surface structure of nascent PAN fiber were observed in relation to coagulation ability (the product of diffusion coefficients of two solvents). Coagulation ability was found to have a significant influence on both the cross sectional and surface morphology of nascent fiber. To obtain nascent fiber with circular cross sectional and smooth surface morphology, coagulation ability should be controlled at low value.

Effects of Coagulation-Bath Temperature on the Formation Process of PVDF-g-PNIPAAm/poly(NIPAAm-co-AAc-L-Phe) Membrane

2015 ◽  
Vol 713-715 ◽  
pp. 2681-2684
Author(s):  
Xiao Tong Liang ◽  
Meng Xin Gu ◽  
Jin Ling Li ◽  
Xue Wang ◽  
Yi Ping Zhao ◽  
...  
Keyword(s):  
Formation Process ◽  
Vinylidene Fluoride ◽  
Bath Temperature ◽  
Time Domain Reflectometry ◽  
Coagulation Bath ◽  
Racemic Mixture ◽  
Inversion Method ◽  
Membrane Formation ◽  
Ultrasonic Time ◽  
Coagulation Bath Temperature

In this work, poly (vinylidene fluoride)-graft-poly (N-isopropylacrylamide) (PVDF-g-PNIPAAm) thermo-sensitive polymer and poly (NIPAAm-co-AAc-L-Phe) chiral micro-gels were synthesized firstly. A chiral thermo-sensitive membrane for phenylalanine separation of the racemic mixture was prepared by phase inversion method with the blend of poly (NIPAAm-co-AAc-L-Phe) and PVDF-g-PNIPAAm. The blend membrane formation mechanism of the casting solutions in water bath thermodynamics at different temperatures and the process of membrane formation were investigated via cloud point determination and ultrasonic time-domain reflectometry (UTDR). The results showed that the inversion between hydrophilicity and hydrophobicity of PNIPAAm contributed to the membrane formation process. From the time needed in membrane forming recorded by ultrasonic signal spectra, it can be found that the speed for solidification was increased when the coagulation-bath temperature was higher than 30°C.

scholarly journals Thermal and electrical characterization of poly(vinyl)alcohol)/poly(vinylidene fluoride) blends reinforced with nano – graphene platelets

Polymer ◽  
2021 ◽  
pp. 123731
Author(s):  
Eirini Kolonelou ◽  
Eirini Loupou ◽  
Panagiotis A. Klonos ◽  
Elias Sakellis ◽  
Dimitra Valadorou ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Vinylidene Fluoride ◽  
Electrical Characterization ◽  
Poly Vinyl Alcohol ◽  
Poly Vinylidene Fluoride ◽  
Graphene Platelets ◽  
Nano Graphene
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