Viscoelastic properties of borax loaded CMC‐g‐cl‐poly(AAm) hydrogel composites and their boron nutrient release behavior

Abstract

Borax (Na 2 B 4 O 7 , 10.5% Boron) loaded CMC-g-cl-Poly(AAm) hydrogel composites were prepared by in situ grafting of acrylamide on to sodium carboxymethyl cellulose in the presence of borax by free radical polymerization technique to develop slow boron (B) delivery device. The composition, morphology, and mechanical properties of synthesized composites were studied by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, texture analyser, and dynamic shear rheometer. Characterization revealed formation of borate ion (BO 32 3 ) from borax during polymerization reaction leading to extensive crosslinking of cellulosic chains and generation of mechanically strong composite hydrogels. Dynamic release of BO 32 3 from the synthesized composites hydrogels followed Fickian diffusion mechanism and composites with high mechanical strength resulted in slow release of B.

Zeolite reinforced carboxymethyl cellulose‐Na+‐g‐cl‐poly(AAm) hydrogel composites with pH responsive phosphate release behavior

“…Inorganic filler (attapulgite, kaolin, alumina, silica gel, mica, etc.) reinforced hydrogel composites are of particular interest due to superior economics over corresponding nanocomposite hydrogels . These hydrogel composites have also been reported as effective controlled release carriers of fertilizers.…”

Macroporous open cell polyester amphigel using citric acid and PEO: Solvent absorption, thermal behavior, and slow release of pesticide

“…23 But it was very well proven that in a gel-based formulation, a higher amount of cross-linked density was always led to a slower release of encapsulated bioactive molecules. 26,27 It was found that the values of R 2 and SSR of the Korsmeyer-Peppas model (Equation 4) fitted to the release data were inferior as compared to Gallagher-Corrigen model (Equation 5), which was fitted well to the release data ( Figure 6(a,b); Table 4). However, based on the diffusion exponent value (n < 0.5) (Table 4), it can be said that the release from the CAPEO was mainly driven by Fickian diffusion.…”

“…Korsmeyer‐Peppas model (Equation ) 24 and Gallagher‐Corrigan model 25 were used. To describe the release behavior of bioactive molecules from a controlled release system these two models had been used extensively 22,23,26–28 …”

“…To describe the release behavior of bioactive molecules from a controlled release system these two models had been used extensively. 22,23,[26][27][28]…”

A green route to prepare fluorescent and absorbent nano-hybrid hydrogel for water detection

“…Poly vinyl alcohol (PVA) was used as a precursor to synthesize intercrossed phosphorescent Eu 2+ /Dy 3+ doped SrAl 2 O 4 hydrogels to overcome the aggregation induced quenching effect 23 . According to the origin of raw materials 24 , hydrogels are generally classified as biopolymer-based and synthetic-based 25 – 27 . Referring to synthetic-based ones, the monomer of synthetic materials, such as vinyl acetate 28 and acrylamide 29 , which are mainly manufactured as disposable products and disposed by landfill and incineration, leading to the serious environmental pollution.…”