New polyvinyl chloride/thermoplastic polyurethane membranes with potential application in nanofiltration

Maghsoud, Zahra; Pakbaz, Mojgan; Famili, Mohammad Hossein Navid; Madaeni, S.S.

doi:10.1016/j.memsci.2017.07.001

Cited by 27 publications

(15 citation statements)

References 34 publications

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“…Phase inversion method, subcritical CO 2 foaming, freezedrying, gas foaming, micro-molding and 3D printing have been widely used to prepare EMI shielding materials with porous structures [24][25][26]. Phase separation methods include non-solvent-induced phase separation (NIPS), thermally induced phase separation (TIPS) and vapor-induced phase separation (VIPS) [27,28]. Since porous polymer materials can be prepared by phase separation methods, NIPS as the most commonly and widely employed technique can be used to fabricate EMI shielding materials with microcellular structures [29].…”

Section: Introductionmentioning

confidence: 99%

Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

et al. 2021

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Lightweight microcellular polyurethane (TPU)/carbon nanotubes (CNTs)/ nickel-coated CNTs (Ni@CNTs)/polymerizable ionic liquid copolymer (PIL) composite foams are prepared by non-solvent induced phase separation (NIPS). CNTs and Ni@CNTs modified by PIL provide more heterogeneous nucleation sites and inhibit the aggregation and combination of microcellular structure. Compared with TPU/CNTs, the TPU/CNTs/PIL and TPU/CNTs/Ni@CNTs/PIL composite foams with smaller microcellular structures have a high electromagnetic interference shielding effectiveness (EMI SE). The evaporate time regulates the microcellular structure, improves the conductive network of composite foams and reduces the microcellular size, which strengthens the multiple reflections of electromagnetic wave. The TPU/10CNTs/10Ni@CNTs/PIL foam exhibits slightly higher SE values (69.9 dB) compared with TPU/20CNTs/PIL foam (53.3 dB). The highest specific EMI SE of TPU/20CNTs/PIL and TPU/10CNTs/10Ni@CNTs/PIL reaches up to 187.2 and 211.5 dB/(g cm−3), respectively. The polarization losses caused by interfacial polarization between TPU substrates and conductive fillers, conduction loss caused by conductive network of fillers and magnetic loss caused by Ni@CNT synergistically attenuate the microwave energy.

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Section: Introductionmentioning

confidence: 99%

Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

et al. 2021

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“…Increment in the porosity of PC by addition of PU content can be interpreted as follows: The PU polymer is a glassy or semi‐crystalline thermoplastic and a soft elastomer which has a lower glass‐rubber transition temperature (T g ) with respect to the PC polymer; therefore, addition of PU to PC caused the solution viscosity to decrease. [ 38 ] On the other hand, lower solution viscosity is responsible for delayed demixing and verification of the membrane structure compared to neat PC membranes and therefore the overall porosity of the membrane was achieved.…”

Section: Resultsmentioning

confidence: 99%

“…Similar observation was reported in the preparation of the polyvinyl chloride (PVC)‐PU blend membrane. [ 38 ] By addition of Al 2 O 3 nanostructures, the finger‐shaped voids seemed to elongate across the entire thickness, and thus become broader close to the back side of the prepared membrane. Due to high affinity between Al 2 O 3 nanoparticles and nonsolvents, an elongated finger‐shaped architecture is likely to be created owing to the greater solvent/nonsolvent exchange amount.…”

Section: Resultsmentioning

confidence: 99%

Effect of alumina nanoparticles on the antifouling properties of polycarbonate‐polyurethane blend ultrafiltration membrane for water treatment

Etemadi

Afsharkia

Zinatloo-Ajabshir

et al. 2021

Polymer Engineering & Sci

106

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In this work, the flexibility of polycarbonate (PC) membrane was improved by using polyurethane (PU) additive. However, due to the hydrophobic nature of the PU polymer, alumina (Al2O3) nanoparticles were incorporated to PC‐PU blend membrane. The prepared membranes have been used in a submerged membrane system to eliminate humic acid molecules from polluted water in both the presence and absence of coagulant (polyaluminum chloride). The obtained results showed that introduction of PU into PC membrane diminished hydrophilicity and enhanced porosity. Moreover, the flexibility of the PC membrane remarkably improved. Introduction of 1.5 wt% Al2O3 to the PC‐PU blend membrane led to enhancement in both porosity and hydrophilicity. Results of morphological studies showed that in the presence of Al2O3 nanostructures, finger‐shaped voids seemed to elongate across the entire thickness of the prepared membrane. Atomic force microscopy images showed that incorporation of PU and Al2O3 to the PC membrane resulted in a smoother surface. The antifouling performance of membranes revealed that the PC‐PU/Al2O3 nanocomposite membrane possessed the most favorable antifouling features owing to its lowest surface roughness as well as highest hydrophilicity. For all membranes utilizing coagulant (PAC), the irreversible fouling ratio and the flux recovery ratio significantly diminished and increased, respectively.

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“…The asymmetric flat-sheet membranes were synthesis by the immersion precipitation phase inversion method. According to the literature [13][14][15][16], the casting solutions were prepared in DMAC solvent by dissolve 15 wt.% of pure PVC and graft 3M. While preparing graft 3M / PVP membranes, graft 3M solution was prepared in three different ratios (14, 13, 12% wt.)…”

Section: Membrane Preparationmentioning

confidence: 99%

Effect of Polyvinyl Pyrrolidone on Polyvinyl Chloride-Graft-Acrylamide Membranes

Al-Bahate¹,

Shabeeb

Khalil

2020

ETJ

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Polyvinyl-chloride (PVC) was dehydrochlorinated by alkaline-solution (NaOH) in determining molarity (3.0 M) followed by grafting with acrylamide (AM) monomer onto dehydrochlorinated PVC (DHPVC) backbone by free-radical graft copolymerization to produce new grafted polymer referred as graft 3M. Then investigated the effect of polyvinyl pyrrolidone (PVP) addition on the grafted polymer. Membranes from pure PVC, graft 3M, and graft 3M/ PVP were synthesis via a phase inversion method. The successful AM grafting onto PVC was confirmed by characterization of the membranes by Atomic Force Microscopy (AFM) and Field Emission Scanning Electron Microscope (FESEM) analysis, porosity, pore size, and contact angle measurements. The new synthesis (graft 3M) and (graft 3M/ PVP) membranes show excellent hydrophilicity in compared to pure PVC membranes, confirmed by higher pure water flux (PWF). The graft 3M/ 3wt.% PVP membrane exhibited the highest pure water permeate flux was about 540 L/m2 h at 28 °C of feed temperature and 1bar of pressure, i.e. was improved by about 270 times compared to the unmodified PVC membrane and 2.35 times compared to the graft 3M membrane.

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New polyvinyl chloride/thermoplastic polyurethane membranes with potential application in nanofiltration

Cited by 27 publications

References 34 publications

Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

Interface Engineered Microcellular Magnetic Conductive Polyurethane Nanocomposite Foams for Electromagnetic Interference Shielding

Effect of alumina nanoparticles on the antifouling properties of polycarbonate‐polyurethane blend ultrafiltration membrane for water treatment

Effect of Polyvinyl Pyrrolidone on Polyvinyl Chloride-Graft-Acrylamide Membranes

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