Preparation of novel amphoteric polyacrylamide and its synergistic
               retention with cationic polymers

Yang, Kaiji; Chen, Jinghuan; Fu, Qingjin; Dun, Xuji; Chen, Yao

doi:10.1515/epoly-2020-0026

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…1 . The IR spectra of all products confirm the presence of amide carbonyl and N-H groups as indicated by the absorption bands at 1650 and 3400 cm −1 , respectively [ 22 ]. It was observed that PAM-DMAPS and PAM-AMPS units exhibit several characteristics bands.…”

Section: Resultsmentioning

confidence: 97%

Synthesis of novel modified acrylamide copolymers for montmorillonite flocculants in water-based drilling fluid

Faridi,

Mobinikhaledi,

Moghanian

et al. 2023

BMC Chemistry

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A study was conducted to treat the water-based drilling fluid through coagulation-flocculation. Innovative modified acrylamide copolymers were utilized as montmorillonite flocculants to improve drilling performance and reduce environmental contamination. A series of acrylamide copolymers was prepared by in situ free radical polymerization in aqueous medium using ammonium persulfate as a radical initiator. The chemical structure of the prepared copolymers was confirmed by FT-IR (Fourier-Transform Infrared Spectroscopy) and the polydispersity indices of the copolymers determined using gel permeation chromatography. Thermal gravimetric analysis showed that the copolymers have a very high temperature tolerance, i.e. they are stable up to 390 °C. In this paper, acrylamide copolymers were used as coagulant with cationic, anionic groups or both of them simultaneously. Consequently, in order to clarify the relationship between inhibitive properties, sedimentation volume measurement, SEM (scanning electron microscope), XRD (X-ray diffraction) and contact angle were adopted. Some factors including molecular weight and molecular chain affecting the interaction between copolymers and clay particles were analyzed. Anionic sample with the highest molecular weight can reduce the interlayer spacing of the hydrated clay to the minimum. Amphoteric sample exhibits the best performance as a coagulant in comparison with other copolymers.

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Section: Resultsmentioning

confidence: 97%

Synthesis of novel modified acrylamide copolymers for montmorillonite flocculants in water-based drilling fluid

Faridi,

Mobinikhaledi,

Moghanian

et al. 2023

BMC Chemistry

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“…In the case of PS/P(MMA-AAm-EGDMA) composite polymer particles, the characteristic stretching bands of C–O–C and CO were observed at 1341 and 1723 cm –1 , respectively, confirming the presence of ester , (Figure b). The characteristic stretching bands of CO, N–H, and C–NH 2 due to amide groups appeared at 1667, 3196, and 3352 cm –1 , respectively . Both PS seed and PS/P(MMA-AAm-EGDMA) composite polymer particles contained a broad O–H stretching band derived from adsorbed water.…”

Section: Resultsmentioning

confidence: 99%

“…The characteristic stretching bands of C=O, N–H, and C–NH 2 due to amide groups appeared at 1667, 3196, and 3352 cm –1 , respectively. 45 Both PS seed and PS/P(MMA-AAm-EGDMA) composite polymer particles contained a broad O–H stretching band derived from adsorbed water. These results support the notion that the seeded copolymerization of MMA and AAm onto the surface of PS seed particles proceeded successfully.…”

Section: Resultsmentioning

confidence: 99%

Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Mahamud,

Galib,

Islam

et al. 2023

ACS Omega

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Multifunctional surface-active polymeric composites are attractive materials for the adsorption of various small molecules. Herein, dual-functionalized micron-sized surface-active composite polymer particles were prepared by a three-step process for CO2 adsorption. First, polystyrene (PS) seed particles were prepared via the dispersion polymerization of styrene. PS/P(MMA-AAm-EGDMA) composite polymer particles were then synthesized by aqueous seeded copolymerization of methyl methacrylate (MMA) and acrylamide (AAm) in the presence of an ethylene glycol dimethacrylate (EGDMA) cross-linker. Finally, the amide moieties of PS/P(MMA-AAm-EGDMA) composite particles were converted into an amine-functionalized composite by using the Hofmann degradation reaction. The presence of primary amine groups on the surface of aminated composite particles was confirmed by some conventional chemical routes, such as diazotization and Schiff’s base formation reactions. The formation and functionality of the PS seed, PS/P(MMA-AAm-EGDMA), and aminated PS/P(MMA-AAm-EGDMA) composite polymer particles were confirmed by Fourier transform infrared (FTIR) spectra analyses. Scanning electron microscopy (SEM) analysis revealed spherical shape, size, and surface morphologies of the PS seed, reference composite, and aminated composites. The elemental surface compositions, surface porosity, pore volume, pore diameter, and surface area of both composite particles were evaluated by energy-dispersive X-ray (EDX) mapping, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) analyses. Dynamic light scattering (DLS) and ζ-potential measurements confirmed the pH-dependent surface properties of the functionalized particles. The amount of the adsorbed anionic emulsifier, sodium dodecyl sulfate (SDS), on the surface of aminated PS/P(MMA-AAm-EGDMA) is higher at pH 4 than that at pH 10. A vice versa result was found in the case of cationic surfactant, hexadecyltrimethylammonium bromide (HTABr), adsorption. Synthesized aminated composite particles were used as an adsorbent for CO2 adsorption via bubbling CO2 in an aqueous medium. The changes in dispersion pH were monitored continuously during the adsorption of CO2 under various conditions. The amount of CO2 adsorption by aminated composite particles was found to be 209 mg/g, which is almost double that of reference composite particles.

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“…CPAM-3 (DC = 71.17%) had an M n of 9,633,400 g/mol, M w of 20,425,000 g/mol, and D = 2.1202. The CPAM samples synthesized by reverse emulsion copolymerization had molecular weight distributions (D) in the range of 2.1–3.4 [ 28 , 29 ]. This means that the polymer backbone of the CPAM was uniform.…”

Section: Resultsmentioning

confidence: 99%

Optimization Conditions to Obtain Cationic Polyacrylamide Emulsion Copolymers with Desired Cationic Degree for Different Wastewater Treatments

Nguyen,

Nguyen

et al. 2023

Polymers

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The synthesis of cationic polyacrylamides (CPAMs) with the desired cationic degree and molecular weight is essential for various industries, including wastewater treatment, mining, paper, cosmetic chemistry, and others. Previous studies have already demonstrated methods to optimize synthesis conditions to obtain high-molecular-weight CPAM emulsions and the effects of cationic degrees on flocculation processes. However, the optimization of input parameters to obtain CPAMs with the desired cationic degrees has not been discussed. Traditional optimization methods are time-consuming and costly when it comes to on-site CPAM production because the input parameters of CPAM synthesis are optimized using single-factor experiments. In this study, we utilized the response surface methodology to optimize the synthesis conditions, specifically the monomer concentration, the content of the cationic monomer, and the content of the initiator, to obtain CPAMs with the desired cationic degrees. This approach overcomes the drawbacks of traditional optimization methods. We successfully synthesized three CPAM emulsions with a wide range of cationic degrees: low (21.85%), medium (40.25%), and high (71.17%) levels of cationic degree. The optimized conditions for these CPAMs were as follows: monomer concentration of 25%, content of monomer cation of 22.5%, 44.41%, and 77.61%, respectively, and initiator content of 0.475%, 0.48%, and 0.59%, respectively. The developed models can be utilized to quickly optimize conditions for synthesizing CPAM emulsions with different cationic degrees to meet the demands of wastewater treatment applications. The synthesized CPAM products performed effectively in wastewater treatment, with the treated wastewater meeting the technical regulation parameters. 1H-NMR, FTIR, SEM, BET, dynamic light scattering, and gel permeation chromatography were employed to confirm the structure and surface of the polymers.

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Preparation of novel amphoteric polyacrylamide and its synergistic retention with cationic polymers

Cited by 9 publications

References 26 publications

Synthesis of novel modified acrylamide copolymers for montmorillonite flocculants in water-based drilling fluid

Synthesis of novel modified acrylamide copolymers for montmorillonite flocculants in water-based drilling fluid

Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Optimization Conditions to Obtain Cationic Polyacrylamide Emulsion Copolymers with Desired Cationic Degree for Different Wastewater Treatments

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Preparation of novel amphoteric polyacrylamide and its synergistic retention with cationic polymers

Cited by 9 publications

References 26 publications

Synthesis of novel modified acrylamide copolymers for montmorillonite flocculants in water-based drilling fluid

Synthesis of novel modified acrylamide copolymers for montmorillonite flocculants in water-based drilling fluid

Capturing Acidic CO2 Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium

Optimization Conditions to Obtain Cationic Polyacrylamide Emulsion Copolymers with Desired Cationic Degree for Different Wastewater Treatments

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Product

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Capturing Acidic CO₂ Using Surface-Active Difunctional Core–Shell Composite Polymer Particles via an Aqueous Medium