Effect of polymer molecular weight on structure and performance of PVDF hollow fiber membranes prepared via TIPS process with co-extrusion of solvent using triple orifice spinneret

2020 ◽  
pp. 118854
Author(s):  
Pengfei Zhang ◽  
Chuanjie Fang ◽  
Saeid Rajabzadeh ◽  
Wenyi Liu ◽  
Yuandong Jia ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hollow Fiber ◽  
Hollow Fiber Membranes ◽  
Polymer Molecular Weight ◽  
Fiber Membranes ◽  
And Performance

scholarly journals Hydrophilic Dual Layer Hollow Fiber Membranes for Ultrafiltration

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 143
Author(s):  
Lara Grünig ◽  
Ulrich A. Handge ◽  
Joachim Koll ◽  
Oliver Gronwald ◽  
Martin Weber ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hollow Fiber ◽  
Triblock Copolymer ◽  
Pure Water ◽  
Vinyl Pyrrolidone ◽  
Scattering Data ◽  
Coupling Mechanism ◽  
Additive Concentration ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

In this study, a triblock copolymer was used as additive to fabricate new dual layer hollow fiber membranes with a hydrophilic active inner surface in order to improve their fouling resistance. The polymeric components of the solutions for membrane fabrication were poly(ether sulfone), poly(N-vinyl pyrrolidone), and the triblock copolymer. The additive consists of three blocks: a middle hydrophobic poly(ether sulfone) block and two outer hydrophilic alkyl poly(ethylene glycol) blocks. By varying the additive concentration in the solutions, it was possible to fabricate dual layer hollow fiber membranes that are characterized by a hydrophilic inner layer, a pure water permeance of over 1800 L/(m2 bar h) and a molecular weight cut-off of 100 kDa similar to commercial membranes. Contact angle and composition determination by XPS measurements revealed the hydrophilic character of the membranes, which improved with increasing additive concentration. Rheological, dynamic light scattering, transmission, and cloud point experiments elucidated the molecular interaction, precipitation, and spinning behavior of the solutions. The low-molecular weight additive reduces the solution viscosity and thus the average relaxation time. On the contrary, slow processes appear with increasing additive concentration in the scattering data. Furthermore, phase separation occurred at a lower non-solvent concentration and the precipitation time increased with increasing additive content. These effects revealed a coupling mechanism of the triblock copolymer with poly(N-vinyl pyrrolidone) in solution. The chosen process parameters as well as the additive solutions provide an easy and inexpensive way to create an antifouling protection layer in situ with established recipes of poly(ether sulfone) hollow fiber membranes. Therefore, the membranes are promising candidates for fast integration in the membrane industry.

Structure Morphology of Polyethersulfone Hollow Fiber Membrane via Immersion Precipitation Phase Inversion Process

2012 ◽  
Vol 152-154 ◽  
pp. 574-578 ◽  
Author(s):  
Ping Lan ◽  
Wei Wang
Keyword(s):  
Hollow Fiber ◽  
Phase Inversion ◽  
Hollow Fiber Membrane ◽  
Pure Water ◽  
Water Flux ◽  
Additive Concentration ◽  
Hollow Fiber Membranes ◽  
Fiber Membrane ◽  
Fiber Membranes ◽  
And Performance

Polyethersulfone (PES) hollow fiber membranes have been widely used in many fields, such as ultrafiltration, microfiltration, reverse osmosis, liquid/liquid or liquid/solid separation, gas separation, hemodialysis, and so on. In this paper, the sheet PES hollow fiber membranes were prepared. The morphology and performance of membranes can be controlled. By studying the influence of the compositions and conditions on the morphology and performance of PES hollow fiber membrane, the relationship of morphology and performance of the membrane is acquired. The additives were used such as glycerol, BuOH and PEG. In addition, immerse phase inversion was used as membranes preparation method. The morphology of the membrane was controlled by changing kinds of additive, concentration of additive and so on. It was found that the membrane morphologies were changed by additive obviously. Porosity , pure water flux, scanning electron microscopy(SEM) were used to characterize the morphology and performance of the membranes.

Morphology and performance of PVDF TIPS microfiltration hollow fiber membranes prepared from PVDF/DBP/DOP systems for industrial application

2015 ◽  
Vol 91 (6) ◽  
pp. 1697-1708 ◽  
Author(s):  
Qianhua Zhou ◽  
Zhan Wang ◽  
Haijun Shen ◽  
Zhongya Zhu ◽  
Liping Liu ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Industrial Application ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes ◽  
And Performance

Preparation and performance of homogeneous braid reinforced cellulose acetate hollow fiber membranes

Cellulose ◽  
2014 ◽  
Vol 22 (1) ◽  
pp. 695-707 ◽  
Author(s):  
Zuwei Fan ◽  
Changfa Xiao ◽  
Hailiang Liu ◽  
Qinglin Huang
Keyword(s):  
Cellulose Acetate ◽  
Hollow Fiber ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes ◽  
And Performance

PVDF hollow fiber membranes prepared from green diluent via thermally induced phase separation: Effect of PVDF molecular weight

2014 ◽  
Vol 471 ◽  
pp. 237-246 ◽  
Author(s):  
Naser Tavajohi Hassankiadeh ◽  
Zhaoliang Cui ◽  
Ji Hoon Kim ◽  
Dong Won Shin ◽  
Aldo Sanguineti ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Hollow Fiber ◽  
Thermally Induced Phase Separation ◽  
Hollow Fiber Membranes ◽  
Separation Effect ◽  
Thermally Induced ◽  
Fiber Membranes

scholarly journals PVDF/PVDF-g-PACMO blend hollow fiber membranes for hemodialysis: preparation, characterization, and performance

RSC Advances ◽  
2017 ◽  
Vol 7 (43) ◽  
pp. 26593-26600 ◽  
Author(s):  
Zihan An ◽  
Rui Xu ◽  
Fengying Dai ◽  
Gaojian Xue ◽  
Xiaoling He ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Hollow Fiber Membranes ◽  
Fiber Membrane ◽  
Novel Approach ◽  
Fiber Membranes ◽  
And Performance

A novel approach to improve the biocompatibility of PVDF hollow fiber membrane by blending PVDF-g-PACMO copolymer for hemodialysis is provided.

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