Microwave-assisted surface-initiated redox polymerization of acrylamide with functionalized graphene oxide for aqueous lubricant additive

Kumar, Arvind; Behera, Babita; Ray, Siddharth S.

doi:10.1039/c5ra05623c

Cited by 28 publications

(27 citation statements)

References 34 publications

(42 reference statements)

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“…The main characteristics of absorption bands for GO include: O‐H stretching vibrations at 3426 cm −1 , stretching vibrations from C=O in carboxyl groups at 1720 cm −1 , skeletal vibrations from unoxidized graphitic domains at 1600 cm −1 , C‐OH stretching vibrations at 1220 cm −1 , and C‐O stretching vibrations at 1060 cm −1. GO‐xanthate spectra show a significant decrease in O‐H stretching vibrations at 3400 cm −1 indicating that the functional groups on GO surface participate and consume in reaction. Furthermore, the new peaks can be observed at 1045 and 1125 cm −1 that were related to the CS 2 group and asymmetric stretching of the C–O–C group, respectively.…”

Section: Resultsmentioning

confidence: 99%

Graphene oxide grafted poly(acrylic acid) synthesized via surface initiated RAFT as a pH‐responsive additive for mixed matrix membrane

Kochameshki

Mahmoudian

Marjani

et al. 2018

J of Applied Polymer Sci

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Incorporation of nanostructured materials into the membrane matrix is a new strategy to improve mechanical and performance properties. Graphene oxide (GO) is one of the advantageous carbon-based nanomaterials, which recently has been used extensively in this field. However, in the most cases, the surface modification of GO has been considered for the creation of new properties like a response to different stimuli such as temperature, pH, and pressure. In the present study, a well-defined poly(acrylic acid) was grafted on GO using reversible addition-fragmentation chain transfer polymerization technique. This modified GO was incorporated into the mixed matrix membrane as a pH-sensitive additive and its effect on the membrane performance was investigated. The membrane with 5 wt % of modified GO provides better hydrophilicity, flux, antifouling, and rejection properties and so the effect of pH change on the aforementioned characteristic properties was studied for this membrane. It is indicated that modified membrane shows different behaviors in acidic and alkaline conditions. In addition, excellent heavy metal separation was observed among rejection tests, especially for Hg ions.

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Section: Resultsmentioning

confidence: 99%

Graphene oxide grafted poly(acrylic acid) synthesized via surface initiated RAFT as a pH‐responsive additive for mixed matrix membrane

Kochameshki

Mahmoudian

Marjani

et al. 2018

J of Applied Polymer Sci

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“…Therefore, the development of a method that provides the initiation of acrylamide polymerization under the conditions of drying its aqueous solutions is an important applied problem. Although the kinetics and the mechanism of polyacrylamide synthesis have been thoroughly studied [ 16 , 17 ], the search for new methods of initiating the polymerization of acrylamide in mild conditions continues [ 18 , 19 , 20 ]. Earlier, we discovered the possibility of ring opening of cyclooctasulphur in the presence of 1,3-dimethylimidazolium dimethyl phosphate with the formation of phosphorylated linear sulphur oligomers ( Scheme 1 ) [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

The New Approach to the Preparation of Polyacrylamide-Based Hydrogels: Initiation of Polymerization of Acrylamide with 1,3-Dimethylimidazolium (Phosphonooxy-)Oligosulphanide under Drying Aqueous Solutions

et al. 2021

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The new initiator of the polymerization of acrylamide, leading to the formation of crosslinked polyacrylamide, was discovered. The structure of the synthesized polyacrylamide was characterized by XRD, 1Н NMR, and 13С NMR spectroscopy. It was shown that 1,3-dimethylimidazolium (phosphonooxy-)oligosulphanide is able to initiate radical polymerization under drying aqueous solutions of acrylamide, even at room temperature. According to XRF data, the synthesized polyacrylamide gel contains 0.28 wt% of sulphur. The formed polymer network has a low crosslinking density and a high equilibrium degree of swelling. The swelling rate of polyacrylamide gel in water corresponds to the first order kinetic equation with the rate constant 6.2 × 10−2 min−1. The initiator is promising for combining acrylamide polymerization with the processes of gel molding and drying.

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“…In the field of CPAM preparation, microwave can greatly increase the reaction rate, reduce the reaction time and make some hard and demanding reactions proceed swimmingly and favorably because of its high efficiency. [19,20] The potential value of microwave in the reaction of CPAM is highlighted. In addition, microwave has the effect of oscillation, diffusion and assembly, which can modify and control the polymerization.…”

Section: Introductionmentioning

confidence: 99%

Study of microwave‐template initiated copolymerization peculiarity and evaluation on the coal floc distinctive behavior and flocculation performance

Chen

Feng

Liu

et al. 2020

J of Applied Polymer Sci

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Cationic polyacrylamide (CPAM) contains a large number of acylamino and positively charged methyl ammonium chloride groups. It has the advantages of good water solubility, strong adsorption bridging ability, enhanced charge neutralization and destabilization performance, excellent flocculation effect, and wide application. Therefore, CPAM can be used in the treatment of coal washing wastewater, and the research and development of a new flocculant with high efficiency is a hot topic in this field. Template copolymer (TPADM) of methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acrylamide (AM) was synthesized by microwave‐template initiated polymerization with sodium polyacrylate (PAAS) as template. The microwave‐template initiated polymerization is abbreviated as MW‐TP. By analyzing FTIR, 1H (13C) NMR and TG/DSC of TPADM, it was found that TPADM had obvious cationic fragment structure. In addition, the association constant (KM) and the kinetics of the template reaction showed that the MW‐TP was confirmed to be free radical initiated polymerization and I Zip‐up (ZIP) polymerization mechanism, which demonstrated the formation of the cationic fragment structure again. This new cationic fragment structure greatly enhanced the ability of charge neutralization, electrical patching and adsorption bridging, thus improving the flocculation performance. Compared with cationic P(AM‐DMC) (CPADM), Commercial cationic polypropanamide (CCPAM‐1 and CCPAM‐2), TPADM had better flocculation effect on coal washing wastewater. Under the optimum flocculation conditions (dosage = 16 mg/L, pH = 7.5), suspended solid (SS) concentration and turbidity of coal washing wastewater treated by TPADM reached 14.3 mg/L and 8.7 NTU, respectively. The floc formation, breakage, and regeneration analyses showed that the cationic fragment structure in TPADM could contribute to the formation of large and high density flocculation structure (d50 ≥ 245 μm, Df ≥ 2.05), and these coal flocs can regenerate rapidly after being broken. Finally, these large and compact flocs help to accelerate the flocs sedimentation and reduce the SS concentration and turbidity of coal washing wastewater, and enhance the effect of solid–liquid separation.

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Microwave-assisted surface-initiated redox polymerization of acrylamide with functionalized graphene oxide for aqueous lubricant additive

Abstract: A fast, efficient and greener synthesized FGO-PAM nanocomposite as an improved aqueous lubricating additive.

Cited by 28 publications

References 34 publications

Graphene oxide grafted poly(acrylic acid) synthesized via surface initiated RAFT as a pH‐responsive additive for mixed matrix membrane

Graphene oxide grafted poly(acrylic acid) synthesized via surface initiated RAFT as a pH‐responsive additive for mixed matrix membrane

The New Approach to the Preparation of Polyacrylamide-Based Hydrogels: Initiation of Polymerization of Acrylamide with 1,3-Dimethylimidazolium (Phosphonooxy-)Oligosulphanide under Drying Aqueous Solutions

Study of microwave‐template initiated copolymerization peculiarity and evaluation on the coal floc distinctive behavior and flocculation performance

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