Nonsolvent-Induced Gelation and Its Effect on Membrane Morphology

Lin, Kun-You; Wang, Da-Ming; Lai, Juin‐Yih

doi:10.1021/ma020073y

Cited by 121 publications

(91 citation statements)

References 26 publications

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“…Moreover, the viscosity growth by LiCl addition will induce pre-gelation process before coagulation due to the strong interaction among LiCl, DMAc, and PVDF-CTFE [44,45]. The pregelation would result in S-L demixing of the casting solution, which benefited the polymer crystallization process in coagulation bath.…”

Section: Membrane Morphology 321 Effects Of Liclmentioning

confidence: 99%

Preparation of PVDF-CTFE hydrophobic membranes for MD application: Effect of LiCl-based mixed additives

Zheng

Wei

et al. 2016

Journal of Membrane Science

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a b s t r a c tHydrophobic flat-sheet membranes were prepared by poly (vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) via the non-solvent induced phase separation (NIPS) process for membrane distillation (MD) application. Different types of LiCl-based mixed additives were applied to investigate their effects on membrane properties and MD performance. The membranes were evaluated in terms of membrane morphology, pore size and distribution, porosity, surface roughness, hydrophobicity, as well as the direct contact membrane distillation (DCMD) performance. Clear evidences were obtained that the mixed additives altered the phase inversion process, which resulted in the variation in membrane morphology, structure, properties and performance. The mass ratio of PEG/LiCl ranging from 5:0 to 0:5 was comprehensively investigated to study the synergistic effects of two additives on PVDF-CTFE membranes. The membrane M5 (PEG:LiCl ¼1:1, total content 8 wt% ) showed optimal properties and MD performance for combining the structure of higher hydrophobicity and pore interconnectivity, small pore size and narrow pore size distribution. The addition of LiCl to PEG-containing solutions benefited the solid-liquid demixing process, which increased the hydrophobicity, porosity, pore interconnectivity, and MD performance of the resultant membranes. While added PEG to LiCl-containing solutions showed slightly influences. Furthermore, it was also found that PVP/LiCl and glycerol/LiCl were not suitable for hydrophobic membrane preparation as they strikingly reduced membrane hydrophobicity. While H 3 PO 4 and H 2 O were confirmed suitable to mix with LiCl for hydrophobic PVDF-CTFE membrane preparation.

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Section: Membrane Morphology 321 Effects Of Liclmentioning

confidence: 99%

Preparation of PVDF-CTFE hydrophobic membranes for MD application: Effect of LiCl-based mixed additives

Zheng

Wei

et al. 2016

Journal of Membrane Science

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“…Diffusion in polymer solution has been studied for decades using several techniques such as gravimetry (Hu, 1996), membrane permeation (Smith, 1988), fluorescence (Winsudel, 1996), and dynamic light scattering (Asten, 1996), Raman spectroscopy (Kim, 2000, Tsai andTorkelso, 1990), and recently ATR-FTIR , Lin, 2002. Through the FTIR spectroscopy a spot near the interface of a thin layer of casting solution has been examined.…”

Section: Measurement Of Mass Transfer Pathsmentioning

confidence: 99%

Diffusion in Polymer Solids and Solutions

Karimi¹

2011

Mass Transfer in Chemical Engineering Processes

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“…8,[16][17][18] During gelation, several connections between polymeric chains occur, forming a three-dimensional network that becomes the dense layer later in the process. CIPS is the first technique to use chemical associations instead of physical associations to form the dense top layer of asymmetric membranes prepared via phase inversion.…”

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confidence: 99%

Complexation-Induced Phase Separation: Preparation of Composite Membranes with a Nanometer-Thin Dense Skin Loaded with Metal Ions

2015

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We present the development of a facile phaseinversion method for forming asymmetric membranes with a precise high metal ion loading capacity in only the dense layer. The approach combines the use of macromolecule-metal intermolecular complexes to form the dense layer of asymmetric membranes with nonsolvent-induced phase separation to form the porous support. This allows the independent optimization of both the dense layer and porous support while maintaining the simplicity of a phase-inversion process. Moreover, it facilitates control over (i) the thickness of the dense layer throughout several orders of magnitude from less than 15 nm to more than 6 μm, (ii) the type and amount of metal ions loaded in the dense layer, (iii) the morphology of the membrane surface, and (iv) the porosity and structure of the support. This simple and scalable process provides a new platform for building multifunctional membranes with a high loading of well-dispersed metal ions in the dense layer.

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Nonsolvent-Induced Gelation and Its Effect on Membrane Morphology

Cited by 121 publications

References 26 publications

Preparation of PVDF-CTFE hydrophobic membranes for MD application: Effect of LiCl-based mixed additives

Preparation of PVDF-CTFE hydrophobic membranes for MD application: Effect of LiCl-based mixed additives

Diffusion in Polymer Solids and Solutions

Complexation-Induced Phase Separation: Preparation of Composite Membranes with a Nanometer-Thin Dense Skin Loaded with Metal Ions

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