Microporous polypropylene membrane prepared via TIPS using environment-friendly binary diluents and its VMD performance

Wang, Yujie; Zhao, Zhi‐Ping; Xi, Zhenyu; Yan, Suying

doi:10.1016/j.memsci.2017.11.023

Cited by 57 publications

(26 citation statements)

References 50 publications

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“…Capillary membranes from hydrophobic polymers for MF process are manufactured mainly using Dry Stretch Process (DSP) or Thermally Induced Phase Separation (TIPS) [1,16,17,[22][23][24][25]. During DSP the polymer is heated and extruded into a nonporous fiber.…”

Section: Introductionmentioning

confidence: 99%

“…Extruded material is stretched under various temperatures to generate pore population and respective pore size to provide specific porosity (open area). For membrane preparation via the TIPS method, a homogeneous solution is prepared by dissolving of polymer in a low-molecular-weight diluent at high temperature and then the homogeneous polymer solution (formed in capillary shape) is cooled to induce the phase separation [22][23][24][25]. A crystal nucleation and growth determined the morphology and mechanical strength of the membrane [17,24,25].…”

Section: Introductionmentioning

confidence: 99%

“…The realization of industrial implementation requires membranes to be as cheap as possible, namely, manufactured by a simple method from inexpensive raw materials [2,18]. Such conditions are fulfilled by the capillary membranes produced from polypropylene by a TIPS method [22,26,27]. Several promising results using such membranes for various applications of MD process were achieved [16,17,22,28].…”

Section: Introductionmentioning

confidence: 99%

“…Such conditions are fulfilled by the capillary membranes produced from polypropylene by a TIPS method [22,26,27]. Several promising results using such membranes for various applications of MD process were achieved [16,17,22,28]. However, the TIPS process parameters and the diluent type and its concentration in the polymer/diluent system have a considerable impact on the course of the phase separation behaviors and the final membrane microstructure for PP membranes [17,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Several promising results using such membranes for various applications of MD process were achieved [16,17,22,28]. However, the TIPS process parameters and the diluent type and its concentration in the polymer/diluent system have a considerable impact on the course of the phase separation behaviors and the final membrane microstructure for PP membranes [17,[22][23][24][25]. Therefore, some PP membranes are not appropriate for MD and they become fast wetted, e.g., during 5 h of MD [17], while the other PP membranes exhibited excellent resistance to wetting over a period of 2 to 4 years of MD investigations [28,29].…”

Section: Introductionmentioning

confidence: 99%

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Capillary Polypropylene Membranes for Membrane Distillation

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2018

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Only nonwetted porous membranes can be used in membrane distillation. The possibility of application in this process the capillary polypropylene membranes manufactured by thermallyinduced phase separation was studied. The performance of a few types of membranes available commercially was presented. The resistance of the membranes to wetting was tested in the continuous process of water desalination. These studies were carried out for 1000 h without module cleaning. The presence of scaling layer on the membranes surface was confirmed by Scanning Electron Microscope observations. Both the permeate flux and distillate conductivity were almost not varied after the studied period of time, what indicates that the used membranes maintained their nonwettability, and the negative influence of scaling was limited. The role of surface porosity on the pore wetting and influence of membrane wettability on the quality of the distillate obtained were discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Capillary Polypropylene Membranes for Membrane Distillation

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2018

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A mechanistic investigation of the directional entrapping modification on the semicrystalline polypropylene surface

Xia

Tan

Zhu

et al. 2020

J of Applied Polymer Sci

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This article concerns a detailed mechanistic investigation of the directional entrapping modification on the polypropylene (PP) surface, when stearyl‐alcohol poly(ethylene oxide) ether (AEO) was applied as the modifier. The results of swelling degree and contact angle are found to exhibit similar evolutions as functions of swelling temperatures and swelling time, revealing that the modifier implantation is closely related to the swelling level of swollen PP. A solvent‐induced crystallization (SINC) and a subsequent crystalline collapse are indicated to occur during surface swelling. Both the amorphous regions on PP surfaces and the microvoids induced by SINC are suggested to contribute to surface swelling and to provide embedding sites for modifier implantation. XRD and DSC analyses reveal a considerably homogeneous distribution of the stearyl segments of AEO in modified surfaces and confirm that the stearyl chain is partially compatible with PP. A thermodynamically stable phase‐mixed structure of modified PP is proposed. The mechanistic investigation gives comprehensive insights into the directional entrapping modification and is significant for the extensive applications of the entrapping method for semicrystalline polymers.

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In situ investigation of formation kinetics of microporous structure in PVDF thin films prepared via thermally‐induced phase separation (TIPS): Effects of film thickness and polymer concentration

Yang

et al. 2021

Nano Select

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In this research, series of PVDF microporous films with various polymer concentrations and thickness were prepared through thermally‐induced phase separation in air condition with diphenyl carbonate as the diluent. Effects of polymer concentration and film thickness on the formation kinetics of microporous structure of PVDF thin films were in situ investigated via TII technique. The instantaneous heat conduction inside the films during film formation was also evaluated. Two types of parameter models were adopted in order to disclose the time and location dependence of TIPS film solidification kinetics, respectively. Hierarchical microstructures, crystallization behavior and thermal properties of the TIPS films were also characterized by SEM, DSC, and TGA, respectively. The current study could supply an insight into the fabrication of PVDF microporous films with target microstructure and desirable performance.

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Microporous polypropylene membrane prepared via TIPS using environment-friendly binary diluents and its VMD performance

Cited by 57 publications

References 50 publications

Capillary Polypropylene Membranes for Membrane Distillation

Capillary Polypropylene Membranes for Membrane Distillation

A mechanistic investigation of the directional entrapping modification on the semicrystalline polypropylene surface

In situ investigation of formation kinetics of microporous structure in PVDF thin films prepared via thermally‐induced phase separation (TIPS): Effects of film thickness and polymer concentration

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