The structure and properties of poly(vinylidene fluoride)/ultrahigh-molecular -weight polyethylene blend hollow fiber membranes via TIPS with mixed diluents

Li, Nana; Lu, Qingchen; Yin, Weiwei; Xiao, Changfa; Li, Jialu

doi:10.1016/j.memsci.2019.117527

Cited by 14 publications

(1 citation statement)

References 42 publications

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“…The actual porosity of the prepared membranes was much lower than the volume fraction of the solvent in the swollen film used to prepare the corresponding membranes. It was previously shown that shrinkage of UHMWPE-based porous materials can be greatly reduced if the solvent is removed by freeze-drying [56,57] or by using supercritical CO 2 [26] or other fluids [58] as an extractant. In the present paper, we limited ourselves to the study of samples prepared in a more industrially friendly way.…”

Section: Uhmwpe Membrane Preparationmentioning

confidence: 99%

Controlled Swelling of Monolithic Films as a Facile Approach to the Synthesis of UHMWPE Membranes

et al. 2023

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A new method of fabricating porous membranes based on ultra-high molecular weight polyethylene (UHMWPE) by controlled swelling of the dense film was proposed and successfully utilized. The principle of this method is based on the swelling of non-porous UHMWPE film in organic solvent at elevated temperatures, followed by its cooling and further extraction of organic solvent, resulting in the formation of the porous membrane. In this work, we used commercial UHMWPE film (thickness 155 μm) and o-xylene as a solvent. Either homogeneous mixtures of the polymer melt and solvent or thermoreversible gels with crystallites acting as crosslinks of the inter-macromolecular network (swollen semicrystalline polymer) can be obtained at different soaking times. It was shown that the porous structure and filtration performance of the membranes depended on the swelling degree of the polymer, which can be controlled by the time of polymer soaking in organic solvent at elevated temperature (106 °C was found to be the optimal temperature for UHMWPE). In the case of homogeneous mixtures, the resulting membranes possessed both large and small pores. They were characterized by quite high porosity (45–65% vol.), liquid permeance of 46–134 L m−2 h−1 bar−1, a mean flow pore size of 30–75 nm, and a very high crystallinity degree of 86–89% at a decent tensile strength of 3–9 MPa. For these membranes, rejection of blue dextran dye with a molecular weight of 70 kg/mol was 22–76%. In the case of thermoreversible gels, the resulting membranes had only small pores located in the interlamellar spaces. They were characterized by a lower crystallinity degree of 70–74%, a moderate porosity of 12–28%, liquid permeability of up to 12–26 L m−2 h−1 bar−1, a mean flow pore size of up to 12–17 nm, and a higher tensile strength of 11–20 MPa. These membranes demonstrated blue dextran retention of nearly 100%.

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Section: Uhmwpe Membrane Preparationmentioning

confidence: 99%

Controlled Swelling of Monolithic Films as a Facile Approach to the Synthesis of UHMWPE Membranes

et al. 2023

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Construction of membrane formation system with low critical solution temperature for preparing hydrophilic polysulfone membrane via modified reverse thermally induced phase separation process

Yang

Wei

Wang

et al. 2022

Polymer Engineering & Sci

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This paper presents a novel method to construct a membrane formation system featuring a low critical solution temperature (LCST) by incorporating hydroxy terminated hyperbranched polyester (HBPE) into polysulfone (PSF) casting solution. PSF membranes were developed by modified reverse thermally induced phase separation (m‐RTIPS) process while the introduction of HBPE improved the hydrophilicity of the membrane. The critical properties of the flat‐sheet PSF membranes were discussed in detail. The cloud point decreased as the HBPE concentration was increased. When membranes were prepared via m‐RTIPS, the region of bicontinuous finger‐like pores in the sublayer gradually broadened. The membranes showed better permeation properties, larger pore size, and better mechanical properties than those of the membranes prepared via non‐solvent‐induced phase separation (NIPS) process. Furthermore, no matter the enhanced hydrophilicity of membrane or m‐RTIPS membrane‐forming mechanism was beneficial to the anti‐fouling properties. In general, the membrane MPSF‐8‐b had relatively high flux, good hydrophilicity and excellent mechanical properties at 0.8 wt.% HBPE content, and the pure water flux recovery of the membrane was increased to 55.2%.

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Effect of additive and coagulation bath temperature on structure and properties of HDPE membranes via thermally induced phase separation

et al. 2022

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The structure and properties of poly(vinylidene fluoride)/ultrahigh-molecular -weight polyethylene blend hollow fiber membranes via TIPS with mixed diluents

Cited by 14 publications

References 42 publications

Controlled Swelling of Monolithic Films as a Facile Approach to the Synthesis of UHMWPE Membranes

Controlled Swelling of Monolithic Films as a Facile Approach to the Synthesis of UHMWPE Membranes

Construction of membrane formation system with low critical solution temperature for preparing hydrophilic polysulfone membrane via modified reverse thermally induced phase separation process

Effect of additive and coagulation bath temperature on structure and properties of HDPE membranes via thermally induced phase separation

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