Synthesis and Investigation of a Novel pH- and Salt-Responsive Superabsorbent Hydrogel Based on Pectin

Sadeghi, Mohammad; Mohammadinasab, Esmat; Shafiei, Fatemeh

doi:10.13005/ojc/280207

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…The swelling behavior of a superabsorbent HG based on pectin (Pec) and polyacrylic acid (PAA) was studied [61]. Acrylic acid (AA) was graft copolymerized onto pectin backbones by a free radical polymerization technique using ammonium persulfate (APS) as initiator and N , N ′-methylenebis(acrylamide) (MBA) as a cross-linker.…”

Section: Structures Of Hydrogels and Cryogels And Characteristics mentioning

confidence: 99%

Properties of Water Bound in Hydrogels

Gun’ko

Savina

Mikhalovsky

2017

Gels

202

128

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Abstract:In this review, the importance of water in hydrogel (HG) properties and structure is analyzed. A variety of methods such as 1 H NMR (nuclear magnetic resonance), DSC (differential scanning calorimetry), XRD (X-ray powder diffraction), dielectric relaxation spectroscopy, thermally stimulated depolarization current, quasi-elastic neutron scattering, rheometry, diffusion, adsorption, infrared spectroscopy are used to study water in HG. The state of HG water is rather non-uniform. According to thermodynamic features of water in HG, some of it is non-freezing and strongly bound, another fraction is freezing and weakly bound, and the third fraction is non-bound, free water freezing at 0 • C. According to structural features of water in HG, it can be divided into two fractions with strongly associated and weakly associated waters. The properties of the water in HG depend also on the amounts and types of solutes, pH, salinity, structural features of HG functionalities.

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Section: Structures Of Hydrogels and Cryogels And Characteristics mentioning

confidence: 99%

Properties of Water Bound in Hydrogels

Gun’ko

Savina

Mikhalovsky

2017

Gels

202

128

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“…However, different crosslinkers or initiators can affect the reaction between HEMA and wood, which can ultimately affect the performance of the modified wood, so further research on HEMA's use on wood is required. Typically used to prepare high-molecular gel materials, MBA has excellent reactivity properties and biocompatibility [16][17][18]. Because of the existence of vinyl, an ester network is formed when water-solubility 2, N-methylenebisacrylamide (MBA) and 2-hydroxymethacrylate (HEMA) are reacted with wood cell walls using initiators.…”

Section: Introductionmentioning

confidence: 99%

Modification Mechanisms and Properties of Poplar Wood via Grafting with 2-Hydroxyethyl Methacrylate/N,N′-methylenebis(acrylamide) onto Cell Walls

Wang

2023

Polymers

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As the only renewable resource among the four basic materials (steel, cement, plastic, wood), wood itself and wood products have a “low carbon” value and play an important role in storing carbon. The moisture absorption and expansion properties of wood limit its application scope and shorten its service life. To enhance the mechanical and physical properties of fast-growing poplars, an eco-friendly modification procedure has been used. This was accomplished by the in situ modification of wood cell walls by vacuum pressure impregnation with a reaction of water-soluble 2-hydroxyethyl methacrylate (HEMA) and N,N’-methylenebis(acrylamide) (MBA). The anti-swelling efficiency of HEMA/MBA-treated wood was improved (up to 61.13%), whereas HEMA/MBA-treated wood presented a lower weight-gain rate (WG) and water-absorption rate (WAR). It was observed that the modulus of elasticity, hardness, density, and other properties of modified wood had improved significantly, as indicated by XRD analysis. Modifiers diffuse primarily within cell walls and cell interstices of wood, causing crosslinks between the modifiers and the cell walls, reducing its hydroxyl content and blocking the channels for water movement, thereby enhancing its physical properties. This result can be obtained by scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX), Nitrogen adsorption test imaging ATR-FTIR (Attenuated total reflection-Fourier-Transform Infrared) Spectroscopy, and nuclear magnetic resonance (NMR) and Nitrogen adsorption test. Overall, this straightforward, high-performance modification method is crucial for maximizing wood’s efficiency and the sustainable development of human society.

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“…The highest swelling capacity was found in pH 10 which is 3025% in 240 minutes. Some of carboxylate groups are ionized at higher pH and the electrostatic repulsion between COOgroups causes an enhancement of the swelling capacity [11].…”

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confidence: 99%

Study on swelling behaviour of hydrogel based on acrylic acid and pectin from dragon fruit

Abdullah

Lazim

2014

AIP Conference Proceedings

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Abstract. Biocompatible hydrogel based on acrylic acid (AA) and pectin was synthesized using gamma irradiation technique. AA was grafted onto pectin backbone that was extracted from dragon fruit under pH 3.5 and extracts and ethanol ratios (ER) 1:0.5. The optimum hydrogel system with high swelling capacity was obtained by varying the dose of radiation and ratio of pectin:AA. FTIR-ATR spectroscopy was used to verify the interaction while thermal properties were analyzed by TGA and DSC. Swelling studies was carried out in aqueous solutions with different pH values as to determine the pH sensitivity. The results show that the hydrogel with a ratio of 2:3 (pectin:AA) and 30 kGy radiation dose has the highest swelling properties at pH of 10.

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Synthesis and Investigation of a Novel pH- and Salt-Responsive Superabsorbent Hydrogel Based on Pectin

Cited by 5 publications

References 15 publications

Properties of Water Bound in Hydrogels

Properties of Water Bound in Hydrogels

Modification Mechanisms and Properties of Poplar Wood via Grafting with 2-Hydroxyethyl Methacrylate/N,N′-methylenebis(acrylamide) onto Cell Walls

Study on swelling behaviour of hydrogel based on acrylic acid and pectin from dragon fruit

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