Synthesis and Characterization of<i>N</i>-maleyl Chitosan-Cross-Linked Poly(acrylamide)/Montmorillonite Nanocomposite Hydrogels

Yu, Yueqin; Zhu, Chunjing; Liu, Yanping; Zhang, Erchi; Kong, Yanyan

doi:10.1080/03602559.2010.543735

Cited by 27 publications

(2 citation statements)

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“…Tablo 1'de, bozunmaların karşılaştırılmasında önemli kilo kaybı farklılıkları gözlemlendi. Glikozitler ve amid bağları içeren kitosan, toprakta enzim varlığında parçalanabilir ve bu da nihai kütle kaybını indükleyen parçalanmalarına neden olabilir[17,18].15-15-15 gübresinin 30 günlük inkübasyon sonunda %89.25'lik kısmı bozunurken bu oran 15-15-15 (1) kompozitinde %77.57, 15-15-15 (2) ve 15-15-15 (3) kompozitlerinde ise %80.79 ve %87.04 olarak gözlenmiştir. Kitosan kompozitlerinin 15-15-15 gübresine göre daha düşük bozunma oranları göstermesi, kitosan ile çapraz bağlı gübrelerin tutunumuna işarettir.…”

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Coating of 15-15-15 Fertilizer with Chitosan and Characterization of the Obtained Powder Materials

AYIK

Çakmak

Kaya

2021

Aksaray University Journal of Science and Engineering

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The slower and longer release of fertilizers by coating them with polymers is extremely important in terms of both economic and prevention of environmental pollution. Chitosan produced from waste crayfish shells was preferred in the current study because of its biological origin and environmental friendliness, and was used for the coating of 15-15-15 fertilizer.Glutaraldehyde was used as a crosslinker for the coating of 15-15-15 fertilizer with chitosan.In the study, the coating of fertilizers at different concentrations was tried and the carrying capacity of chitosan for 15-15-15 fertilizer was determined. Powder samples produced after coating were characterized using Fourier transform infrared spectrometry (FT-IR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) techniques. Then, the degradation rates of the coated fertilizers in the soil were determined depending on the days. Considering all the obtained results, it has been revealed that chitosan-15-15-15 fertilizer formulation crosslinked with glutaraldehyde can be used practically in agricultural and horticultural applications.

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Coating of 15-15-15 Fertilizer with Chitosan and Characterization of the Obtained Powder Materials

AYIK

Çakmak

Kaya

2021

Aksaray University Journal of Science and Engineering

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“…They find applications in personal hygiene products [2] , food packaging [2] , wound healing devices [3] and water treatment [4] . Although, most of the SAPs commercially produced are anionic (based on acrylic acid and its derivatives) [2] , a wide variety of other superabsorbent polymers have been synthesized [5][6][7][8][9] . The cationic monomers have also been polymerized, either independently [10] or with anionic SAPs to obtain amphoteric SAPs [11][12][13][14][15] .…”

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Photo and Thermal Degradation of a Cationic Superabsorbent Polymer

Shukla

Bhagat

Madras

2013

Polymer-Plastics Technology and Engineering

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A cationic superabsorbent polymer (SAP) was synthesized by carrying out the polymerization of [2-(methacryloyloxy)ethyl] trimethyl ammonium chloride) with N,N 0 -methylenebisacrylamide as the cross-linking agent. The SAP was subjected to degradation in dry and the equilibrium swollen state by thermo gravimetric analysis and exposure to ultraviolet radiation, respectively. The photodegradation was monitored by measuring changes in the swelling capacity and the dry weight of the SAP. The thermal degradation of the SAP occurred in three stages after the initial removal of moisture and the activation energies of the decomposition were determined. INTRODUCTIONThree-dimensional cross-linked networks of hydrophilic polymers that are able to absorb and retain liquids more than 100 times of their own weight are known as superabsorbent polymers (SAPs) [1] . The SAPs contain ionic repeat units, and could classified be as anionic, cationic, amphoteric, or zwitterionic [2] . They find applications in personal hygiene products [2] , food packaging [2] , wound healing devices [3] and water treatment [4] . Although, most of the SAPs commercially produced are anionic (based on acrylic acid and its derivatives) [2] , a wide variety of other superabsorbent polymers have been synthesized [5][6][7][8][9] . The cationic monomers have also been polymerized, either independently [10] or with anionic SAPs to obtain amphoteric SAPs [11][12][13][14][15] .The synthesis routes of the monomer-based SAPs are well established, but there are only a few studies reporting their degradation [16][17] .The SAPs constitute a significant part of domestic waste, making the degradation studies of the synthetic SAPs important. Li and Cui [16] subjected acrylic acid and acrylamide-based SAP to ultravioletinduced decomposition and quantified the degradation by measuring the weight of the SAP at the end of the degradation. Their study, although the first report of its kind, did not provide information about the changes in the swelling capacity of the SAPs during the degradation. In our previous study, we had adopted an improved technique for the photodegradation of poly (acrylic acid-co-sodium acrylate-co-acrylamide) SAPs [17] .The changes in the swelling capacity as well as the residual weights of the SAPs were measured during the degradation and a possible mechanism of the degradation of SAPs was proposed. The SAPs were found to undergo degradation in two stages. In the first stage, the network became sparse and the swelling capacity increased but the residual weight fraction was constant. The rupture of the three-dimensional network took place in the second stage, and thus both the swelling capacity and the residual weights reduced drastically.In the present study, we report the photodegradation of a cationic SAP by the earlier developed method [18] . Here we extend the study to investigate the effect of cross-link density on the photodegradation of the SAP. The cationic SAP poly([2-(methacryloyloxy)ethyl]trimethyl ammonium chloride) (PMALETMAC) was synth...

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Effect of Organic Montmorillonite Type on the Swelling Behavior of Superabsorbent Nanocomposites

Zhang

Yin

et al. 2013

Adv Polym Technol

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ABSTRACT:Montmorillonite was modified with N,N -dimethyl-N-dodecyl methacryloxylethyl ammonium bromide (DMAEA-DB), and cetyl trimethyl ammonium bromide (CTAB) as the intercalation agent. Then, a series of different types of superabsorbent composites based on the monomers acrylic acid (AA), acrylamide (AM), and organic montmorillonite (OMMT) were synthesized through inverse suspension polymerization. The superabsorbent hydrogels prepared were characterized by X-ray diffraction and Fourier transform infrared spectrometer; and the swelling behaviors of the hydrogels were also investigated. Results showed that the intercalation was successful. The water absorbency for poly(AA-AM/DMAEA-DB-MMT) was always higher than that of poly(AA-AM/CTAB-MMT) in the range of the OMMT content investigated. The amount of OMMT also influenced the water absorbency of the hydrogels, they reached the highest water absorbency of 1100 g/g for the former at the content of 10%, and 875 g/g for the latter at the content of 6% in distilled water, respectively. The water absorbency decreased with the increase in the concentration of saline solutions for all the samples. The swelling behavior of the hydrogels was dependent on the pH. Poly(AA-AM/DMAEA-DB-MMT) had a better thermal stability than poly(AA-AM/CTAB-MMT), while having a lower water-retention capacity. C

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Synthesis and Characterization ofN-maleyl Chitosan-Cross-Linked Poly(acrylamide)/Montmorillonite Nanocomposite Hydrogels

Cited by 27 publications

References 21 publications

Coating of 15-15-15 Fertilizer with Chitosan and Characterization of the Obtained Powder Materials

Coating of 15-15-15 Fertilizer with Chitosan and Characterization of the Obtained Powder Materials

Photo and Thermal Degradation of a Cationic Superabsorbent Polymer

Effect of Organic Montmorillonite Type on the Swelling Behavior of Superabsorbent Nanocomposites

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