Grafting Copolymerization of Hydrophilic Monomers Onto Alginate for Modification it's Structure

Sadeghi, Mohammad; Mohammadinasab, Esmat; Shafiei, Fatemeh; Mansouri, Laleh; Shasavari, Hadis

doi:10.13005/ojc/300130

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…At 1022 cm –1 , a band corresponding to CH 2 twisting was also observed. At 871 cm –1 , a band for galactose and mannose appeared. ,, After grafting, the IR spectra of the GH (Figure b) showed additional bands that confirm the successful grafting. The new characteristic band at 3648 cm –1 ,, is due to overlapping of O–H stretching of the O–H group of GG, N–H stretching of the amide group, and −SO 3 H stretching of the grafted AMPS.…”

Section: Resultsmentioning

confidence: 81%

“… 27 , 30 Polymerization reaction is usually carried out by a free-radical-induced mechanism in which persulfate salt (KPS) acted as the initiator. 27 , 31 …”

Section: Introductionmentioning

confidence: 99%

“…During the chemical modification of guar gum for enhanced oil recovery application, it is important to keep certain hydrophilic–lipophilic balance, which enables the molecules to be arranged on the water–oil interface and alter its properties . Guar gum functionalization with nonionic monomers such as acrylates can increase its salt tolerance , and lipophobicity, as well as decrease its biodegradability, while the incorporation of an ionic monomer in the polymer matrix such as AMPS can increase its solubility in water and enhance the thermal stability. , Polymerization reaction is usually carried out by a free-radical-induced mechanism in which persulfate salt (KPS) acted as the initiator. , …”

Section: Introductionmentioning

confidence: 99%

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Guar Gum-Based Hydrogels as Potent Green Polymers for Enhanced Oil Recovery in High-Salinity Reservoirs

et al. 2021

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Improving oil production for high-salinity reservoirs using polymer flooding is challenging due to chemical and mechanical degradations. This study developed two biodegradable biopolymers based on graft copolymerization of guar gum (GG) with two different co-monomers, which are acrylamide (Am) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS), and cross-linked by N,N ′-methylene bisacrylamide (MBA) to face these challenges. The newly synthesized guar gum-based hydrogels, GG- g -poly(Am-AMPS) (GH) and GG- g -poly(Am-AMPS)/Biochar (GBH composite), were evaluated as potential candidates for enhanced oil recovery (EOR) under high-salinity conditions. Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) of the synthesized hydrogels were investigated, and their rheological properties were measured at room temperature. Both GH and GHB display a shear-thinning performance. In polymer flooding experiments, guar gum hydrogel (GH) and guar gum/biochar composite hydrogel (GHB) showed a remarkable influence on delaying the water breakthrough and proved to be effective biopolymers for enhanced oil recovery in high-salinity reservoirs. At the optimum concentration of 5 g/L, GH flooding achieved maximum oil recoveries of 70.53 and 72.11% in secondary and tertiary recovery processes, respectively. Meanwhile, the waterflooding process achieved an ultimate oil recovery of 58.42%. GHB flooding at optimum concentration, 2 g/L, increased the amount of oil recovery by 8.95% in tertiary recovery compared to waterflooding. Furthermore, GH (5 g/L) and GHB (2 g/L) slightly enhanced the rock water wettability as confirmed by contact angle measurements for GH and the relative permeability saturation curves for GH and GHB.

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Section: Resultsmentioning

confidence: 81%

“… 27 , 30 Polymerization reaction is usually carried out by a free-radical-induced mechanism in which persulfate salt (KPS) acted as the initiator. 27 , 31 …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Guar Gum-Based Hydrogels as Potent Green Polymers for Enhanced Oil Recovery in High-Salinity Reservoirs

et al. 2021

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“…Figure 3a) and beyond [Ce 4+ ] = 3.00 × 10 –3 mol L −1 in the case of EMA may be attributed to the fast termination of the growing grafted chains. [ 23–26 ]…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Photo‐Graft Copolymers of Sodium Salt of Partially Carboxymethylated Tamarind Kernel Powder

Trivedi

Joshi

Trivedi

2021

Macromolecular Symposia

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In the present case, the functionalization of sodium salt of partially carboxymethylated tamarind kernel powder (Na-PCMTKP, DS= 0.15), an industrially important natural polymer, is carried out through photo-graft copolymerization of methyl methacrylate (MMA) and ethyl methacrylate (EMA) onto it using ceric ammonium nitrate (CAN) as a photo-initiator. The effects of the concentrations of photo-initiator (CAN), nitric acid, methacrylate monomers (MMA and EMA) and the amount of Na-PCMTKP as well as reaction time and temperature on photo-graft copolymerization are being investigated to achieve the maximum graft yields (%G = 232.2 and %GE = 91.0 in the case of MMA and %G = 206.2 and %GE = 90.0 in the case of EMA). A suitable mechanism to explain the photo-graft copolymerization is being proposed. The kinetics aspect of the photo-graft copolymerization is also studied and the values of the overall activation energy for the photo-graft copolymerization in the case of MMA and EMA are found to be 8.10 and 10.49 kJ mol −1 , respectively. Besides kinetics study, the chemical structure and thermal properties of the graft copolymers of Na-PCMTKP containing PMMA and PEMA is studied by FTIR, TGA, and SEM techniques and the results ascertains the evidence of the successful photo-graft copolymerization of both the methacrylate monomers onto Na-PCMTKP. The synthesized novel graft copolymers may find their potential applications to be used as metal adsorbents as well as novel excipients for direct compression matrix tablets.

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“…7 and Table 4). 26 . The presence of C=O group in the hydrogel spectra indicated the synthesized has been occurred before the synthesis process, this peak in-appearance in the cellulose FT-IR data.…”

Section: Preparation and Characterization Of Cellulose Hydrogelmentioning

confidence: 99%

Synthesized Superabsorbent Based on Cellulose from Rice Straw for Controlled-Release of Urea

Yusnaidar¹,

Wirjosentono²,

Thamrin³

et al. 2017

Orient. J. Chem

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Rice straw was used as a-cellulose sources for synthesizing a novel a -cellulose-g-poly(acrylic acid)superabsorbent by graft polymerization between a-cellulose rice straw powder and acrylic acidin aqueous solution. The synthesis and controlled-release of fertilizer from superabsorbent wascarried out.The super absorbent composite was characterized by FTIR, SEM and TGA. The results of FTIR spectra showed OH of a-cellulose rice straw participated in graft polymerization with acrylic acid. The equilibrium water absorbency of super absorbent was investigated by calculating the swelling ratio. The super absorbent composite was swollen in aqueous solution of urea to load urea. Furthermore, the release of urea from loaded super absorbent was analyzed in water. Super absorbent with the highest water absorbency and the slowest profile of release controlled were obtained when the temperature of polymerization reaction was 70 o C.

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Grafting Copolymerization of Hydrophilic Monomers Onto Alginate for Modification it's Structure

Cited by 6 publications

References 17 publications

Guar Gum-Based Hydrogels as Potent Green Polymers for Enhanced Oil Recovery in High-Salinity Reservoirs

Guar Gum-Based Hydrogels as Potent Green Polymers for Enhanced Oil Recovery in High-Salinity Reservoirs

Synthesis and Characterization of Photo‐Graft Copolymers of Sodium Salt of Partially Carboxymethylated Tamarind Kernel Powder

Synthesized Superabsorbent Based on Cellulose from Rice Straw for Controlled-Release of Urea

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