Synthesis and properties of sodium alginate/Na+rectorite grafted acrylic acid composite superabsorbent via 60Coγ irradiation

Yang, Lianli; Ma, Xiaoyan; Nai-ni, Guo

doi:10.1016/j.carbpol.2011.03.004

Cited by 31 publications

(6 citation statements)

References 23 publications

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“…Alginate is a polysaccharide obtained from brown algae, mainly composed of alginic acid and its salts (ALG), which possess a high content in carboxylic groups that confer them hydrophilic and water-binding properties [ 15 , 16 ]. Alginate is a linear negatively charged copolymer of β- d -manuronate (M) and α- l -guluronate (G), for which different sequences result in different molecular weights [ 17 , 18 ]. Residues of manuronic and guluronic acids can be linked either by forming β (1–4) glucosidic links in MM and MG, or by α (1–4) glucosidic links in GG and GM [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…The gelation of alginate occurs in the presence of multivalent metal ions, as is the case for calcium ions (Ca 2+ ), explained by the generally known “egg-box” model for the complexation of aligned chains of negatively charged G with Ca 2+ [ 10 , 19 ]. Additionally, alginate is an interesting raw material for the food industry and in medicine (e.g., drug delivery tissue engineering) because of its biocompatibility, nontoxicity, and biodegradability [ 18 , 20 , 21 , 22 , 23 ]. Thus, several studies have developed materials containing alginate obtained by different processing strategies, such as casting [ 17 , 20 , 21 , 24 ] or capsule formation [ 23 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Rheology and Water Absorption Properties of Alginate–Soy Protein Composites

et al. 2021

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Composite materials based on proteins and carbohydrates normally offer improved water solubility, biodegradability, and biocompatibility, which make them attractive for a wide range of applications. Soy protein isolate (SPI) has shown superabsorbent properties that are useful in fields such as agriculture. Alginate salts (ALG) are linear anionic polysaccharides obtained at a low cost from brown algae, displaying a good enough biocompatibility to be considered for medical applications. As alginates are quite hydrophilic, the exchange of ions from guluronic acid present in its molecular structure with divalent cations, particularly Ca2+, may induce its gelation, which would inhibit its solubilization in water. Both biopolymers SPI and ALG were used to produce composites through injection moulding using glycerol (Gly) as a plasticizer. Different biopolymer/plasticizer ratios were employed, and the SPI/ALG ratio within the biopolymer fraction was also varied. Furthermore, composites were immersed in different CaCl2 solutions to inhibit the amount of soluble matter loss and to enhance the mechanical properties of the resulting porous matrices. The main goal of the present work was the development and characterization of green porous matrices with inhibited solubility thanks to the gelation of alginate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rheology and Water Absorption Properties of Alginate–Soy Protein Composites

et al. 2021

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“…As oil resources become scarcer, high consumption and pollution of synthetic fiber production is facing huge market pressure. Production of biodegradable fiber has been becoming currently a hot issue (Chang, Duan, Cai, & Zhang, 2010;Zhou, Ma, Shi, Yang, & Nie, 2011;Yang, Ma, & Guo, 2011). Regenerative materials have been the new orientation of the development of new materials since environmental protection attracted global attention for decades.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen bonds of sodium alginate/Antarctic krill protein composite material

Yang

Guo

et al. 2016

Carbohydrate Polymers

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Sodium alginate/Antarctic krill protein composite material (SA/AKP) was successfully obtained by blending method. The hydrogen bonds of SA/AKP composite material were analyzed by Fourier transform infrared spectroscopy (FT-IR) and Nuclear magnetic resonance hydrogen spectrum (HNMR). Experiment manifested the existence of intermolecular and intramolecular hydrogen bonds in SA/AKP system; strength of intermolecular hydrogen bond enhanced with the increase of AKP in the composite material and the interaction strength of hydrogen bonding followed the order: OH…Ether O>OH…π>OH…N. The percentage of intermolecular hydrogen bond decreased with increase of pH. At the same time, the effect of hydrogen bonds on properties of the composite material was discussed. The increase of intermolecular hydrogen bonding led to the decrease of crystallinity, increase of apparent viscosity and surface tension, as well as obvious decrease of heat resistance of SA/AKP composite material. SA/AKP fiber SEM images and energy spectrum showed that crystallized salt was separated from the fiber, which possibly led to the fibrillation of the composite fibers.

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“…One of the major problems with free radical solution polymerization is its low acid content, which requires lots of energy and money to get rid of water in the drying stage. 34 Formulation with acid content greater than 35% is impractical and polymerization is uncontrollable. On the contrary, in microwave-assisted polymerization, since the purpose of microwave heating is to heat the monomer solution and not its surroundings, increased acid content did not affect the polymerization step.…”

Section: Resultsmentioning

confidence: 99%

Microwave‐assisted polymerization: Inert addition and surface coating of superabsorbent polymer for improved physical properties

Azad

Sandros

2016

J of Applied Polymer Sci

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Two different polymerization techniques, microwave-assisted polymerization and free radical solution polymerization, were utilized in the syntheses of superabsorbent polymers with varying amounts of acrylic acid (31-50%). Degrees of neutralization were in the range of 68-80 mol %, and clay level was varied between 0 and 5%. The base polymer produced with microwave-assisted polymerization had higher absorbency under low load (0.3 psi) than those with the free radical solution polymerization. To improve its absorbency under higher loads (0.6 and 0.9 psi), the surface coating step was implemented by using ethylene glycol diglycidyl ether as a surface crosslinking agent. Properties such as capacity, permeability, and absorbency under different loads were tested in 0.9% sodium chloride solution for the base and the surface-coated polymers. In addition, extractables and residual acrylic acid were measured to determine the reaction's efficiency. In conclusion, surface coating improved polymer properties, and the incorporation of clay imparted permeability to the polymer.

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Synthesis and properties of sodium alginate/Na+rectorite grafted acrylic acid composite superabsorbent via 60Coγ irradiation

Cited by 31 publications

References 23 publications

Rheology and Water Absorption Properties of Alginate–Soy Protein Composites

Rheology and Water Absorption Properties of Alginate–Soy Protein Composites

Hydrogen bonds of sodium alginate/Antarctic krill protein composite material

Microwave‐assisted polymerization: Inert addition and surface coating of superabsorbent polymer for improved physical properties

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