Synthesis and characterization of AgBr nanocomposites by templated amphiphilic comb polymer

Koh, Joo Hwan; Seo, Jin Ah; Park, Jung Tae; Kim, Jong Hak

doi:10.1016/j.jcis.2009.07.010

Cited by 21 publications

(12 citation statements)

References 36 publications

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“…Later they prepared PVDF-CTFE-g-PSSA composite NF membrane [26]. In addition, poly(hydroxyl ethyl acrylate) [27], 4-vinylpyridine [28], and poly (oxyethylene methacrylate) [29] have been grafted onto the PVDF-CTFE main chains to obtain the corresponding amphilic copolymer membranes for either proton conducting properties or silver nanoparticle templates. In 2011, Liu et al [30] prepared PVDF-CTFE hydrophobic membranes followed by the hydrophilic modification with immobilization of hydrophilic poly(ethylene glycol) methyl ether methacrylate (PEGMA) by ATRP.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of hydrophobic flat sheet and hollow fiber membranes from PVDF and PVDF-CTFE for membrane distillation

Wang

Zheng

et al. 2016

Journal of Membrane Science

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a b s t r a c tHydrophobic polyvinylidene fluoride (PVDF) membranes have been used in membrane distillation, however its performance in terms of permeation flux and salt rejection still needs to be improved. In this study, polyvinylidenedifluoride-co-chlorotrifluoroethylene (PVDF-CTFE), a PVDF based copolymer, was employed to fabricate both flat sheet and hollow fiber membranes. Two pore forming additives (PEG and LiCl) were used in order to examine their effects on the membrane micro-structure and consequently the distillation performance. The crystalline property of the polymers was studied via X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) to reveal its role in the membrane formation. The membrane morphology (SEM), surface property (AFM) and membrane properties (contact angle, pore size, porosity and pore size distribution) were systematically examined and compared among PVDF, PVDF-CTFE membranes as well as their counterparts with pore forming additives. The results revealed that PVDF-CTFE membrane exhibited optimal membrane morphology, pore structure and hydrophobicity, thus delivering better distillation performance (permeation flux up to 62.09 kg/m 2 h, and distillate conductivity as low as 5 μS/cm) in comparison with their PVDF membrane counterparts.

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Section: Introductionmentioning

confidence: 99%

Fabrication of hydrophobic flat sheet and hollow fiber membranes from PVDF and PVDF-CTFE for membrane distillation

Wang

Zheng

et al. 2016

Journal of Membrane Science

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“…It evidenced that these membranes presented good properties and performances during the lab-scale study. Meanwhile, poly (hydroxyl ethyl acrylate) [23], poly (oxyethylene methacrylate) [24], and 4-vinylpyridine [25] have also been grafting to the PVDF-CTFE to obtain the corresponding amphiphilic copolymer membranes. Liu et al [26] had prepared PVDF-CTFE hydrophobic porous membranes by NIPS, and further hydrophilic modified with the immobilization of hydrophilic poly (ethylene glycol) methyl ether methacrylate (PEGMA) by ATRP for membrane filtration.…”

Section: Introductionmentioning

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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“…The pristine P (VDF‐ co ‐CTFE) exhibited a weak Curie transition temperature at around 92°C and a melting temperature ( T m ) at 166°C. Upon graft copolymerization with P2VP, a strong thermal transition peak appeared at 88°C, which was assigned to glass transition temperatures ( T g ) of P2VP chains . It is clear evidence of the microphase‐separated structure of the amphiphilic graft copolymer into hydrophobic P (VDF‐ co ‐CTFE) main chains and hydrophilic P2VP side chains.…”

Section: Resultsmentioning

confidence: 96%

P (VDF‐co‐CTFE)‐g‐P2VP amphiphilic graft copolymers: Synthesis, structure, and permeation properties

Park

Kim

Ryu

et al. 2019

Polymers for Advanced Techs

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A series of amphiphilic graft copolymers of poly (vinylidene fluoride‐co‐chlorotrifluoroethylene)‐g‐poly(2‐vinyl pyridine), P (VDF‐co‐CTFE)‐g‐P2VP, with different degrees of P2VP grafting (from 26.3 to 45.6 wt%) was synthesized via one‐pot atom transfer radical polymerization (ATRP). The amphiphilic properties of P (VDF‐co‐CTFE)‐g‐P2VP graft copolymers allowed itself to self‐assemble into nanoscale structures. P (VDF‐co‐CTFE)‐g‐P2VP graft copolymers were introduced into neat P (VDF‐co‐CTFE) as additives to form blending membranes. When two different solvents, N‐methyl‐2‐pyrrolidone (NMP) and dimethylformamide (DMF), were used, specific organized crystalline structures were observed only in the NMP systems. P (VDF‐co‐CTFE)‐g‐P2VP played a pivotal role in controlling the morphology and pore structure of membranes. The water flux of the membranes increased from 57.2 to 310.1 L m−2 h−1 bar−1 with an increase in the PVDF‐co‐CTFE‐g‐P2VP loading (from 0 to 30 wt%) due to increased porosity and hydrophilicity. The flux recovery ratio (FRR) increased from 67.03% to 87.18%, and the irreversible fouling (Rir) decreased from 32.97% to 12.82%. Moreover, the pure gas permeance of the membranes with respect to N2 was as high as 6.2 × 104 GPU (1 GPU = 10–6 cm3[STP]/[s cm2 cmHg]), indicating their possible use as a porous polymer support for gas separation applications.

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Synthesis and characterization of AgBr nanocomposites by templated amphiphilic comb polymer

Cited by 21 publications

References 36 publications

Fabrication of hydrophobic flat sheet and hollow fiber membranes from PVDF and PVDF-CTFE for membrane distillation

Fabrication of hydrophobic flat sheet and hollow fiber membranes from PVDF and PVDF-CTFE for membrane distillation

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

P (VDF‐co‐CTFE)‐g‐P2VP amphiphilic graft copolymers: Synthesis, structure, and permeation properties

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