Microfiltration membranes prepared from acryl amide grafted poly(vinylidene fluoride) powder and their pH sensitive behaviour

Yang, Xiaojing; Deng, Bo; Liu, Zhongying; Liuqing, Shi; Bian, Xiaokai; Yu, Miao; Li, Linfan; Li, Jingye; Lu, Xin

doi:10.1016/j.memsci.2010.06.057

Cited by 32 publications

(16 citation statements)

References 41 publications

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“…However their utilization for biomedical applications, such as selective permeation and controlled drug release and delivery, is limited to some extent by the hydrophobic nature of the polymer. Moreover, for these applications, it could be important to impart the matrix a stimuli-responsive behaviour allowing reversible changes in their properties in response to some environmental stimuli, such as temperature and pH [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Preparation of pH sensitive poly(vinilydenefluoride) porous membranes by grafting of acrylic acid assisted by supercritical carbon dioxide

Ferro

Scialdone

Galia

2012

The Journal of Supercritical Fluids

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Free radical grafting of acrylic acid (AA) on poly(vinilydenefluoride) (PVDF) porous membranes was studied at 65°C using supercritical carbon dioxide (scCO 2) as a solvent and delivery agent. The process was initiated by the thermal decomposition of benzoylperoxide (BPO). Spectroscopic analyses confirmed the presence of poly(AA) chains linked to treated membranes. The mass fraction of grafted AA increased with grafting time and BPO concentration while it decreased when the density of the fluid phase was enhanced. A not-monotonic trend was obtained when the effect of the initial AA concentration was studied. The grafting process was accompanied by a reduction of the crystallinity of the PVDF matrix. Flow measurements and caffeine release experiments performed using PVDF membranes with proper grafting degree exhibited a pH dependent behaviour. © 2011 Elsevier B.V

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Section: Introductionmentioning

confidence: 99%

Preparation of pH sensitive poly(vinilydenefluoride) porous membranes by grafting of acrylic acid assisted by supercritical carbon dioxide

Ferro

Scialdone

Galia

2012

The Journal of Supercritical Fluids

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“…In order to further investigate the compositions of the as-synthesized samples, XPS was performed and the XPS spectra of pristine PVDF powder, grafted powder, and the AIEM (GY = 28.4%) are shown in Figure 6. The tiny peaks of O in pristine PVDF might have been due to the remaining reagents by the supplier [41]. The EA (Table 1) showed that the amount of DMAEMA in the grafted powder was low.…”

Section: Resultsmentioning

confidence: 99%

Amphoteric Ion Exchange Membranes Prepared by Preirradiation-Induced Emulsion Graft Copolymerization for Vanadium Redox Flow Battery

et al. 2019

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A series of poly(vinylidene difluoride)-based amphoteric ion exchange membranes (AIEMs) were prepared by preirradiation-induced graft copolymerization of styrene and dimethylaminoethyl methacrylate in an aqueous emulsion media followed by solution casting, sulfonation, and protonation. The effects of absorbed dose and comonomer concentration on grafting yield (GY) were investigated. The highest GY of 44.5% at a low comonomer concentration of 0.9 M could be achieved. FTIR, TGA, and X-ray photoelectron spectroscopy (XPS) confirmed the successful grafting and sulfonation of the as-prepared AIEMs. Properties of the AIEMs such as water uptake, ion exchange capacity (IEC), ionic conductivity, and crossover behavior of VO2+ ions prepared by this novel technique were systematically investigated and compared with those of the commercial Nafion 115 membrane. It was found that at a GY of 28.4%, the AIEMs showed higher IEC and conductivity, lower permeability of VO2+ ions, and a longer time to maintain open circuit voltage than Nafion 115, which was attributed to their high GY and elaborate amphoteric structure. Consequently, this work has paved the way for the development of green and low-cost AIEMs with good performance for vanadium redox flow battery applications.

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“…56,[73][74][75][76] Generally, membrane pore size modulation by external triggers heavily dominates the intelligent membrane research thus far. [77][78][79] However, news designs and concepts are emerging in combining responsive chemistry with membranes toward better membrane performance. For example, stimuli responsive materials have been combined with RO membranes to improve their antifouling properties and been incorporated into the membranes to endow the membrane with self-healing capability.…”

Section: Designing Filtration Membranes With Responsive Gatesmentioning

confidence: 99%

Intelligent environmental nanomaterials

Chang

Zhang

Wang

2018

Environ. Sci.: Nano

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Microfiltration membranes prepared from acryl amide grafted poly(vinylidene fluoride) powder and their pH sensitive behaviour

Cited by 32 publications

References 41 publications

Preparation of pH sensitive poly(vinilydenefluoride) porous membranes by grafting of acrylic acid assisted by supercritical carbon dioxide

Preparation of pH sensitive poly(vinilydenefluoride) porous membranes by grafting of acrylic acid assisted by supercritical carbon dioxide

Amphoteric Ion Exchange Membranes Prepared by Preirradiation-Induced Emulsion Graft Copolymerization for Vanadium Redox Flow Battery

Intelligent environmental nanomaterials

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