Controlled Release of Urea Through Mesoporous Methylcellulose Films Derived From<i>N</i>,<i>N</i>Dimethyl Formamide

Singh, Reeti; Kumari, Kamlesh; Kundu, Patit Paban

doi:10.1080/00914037.2013.769238

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…Therefore, the internal energy is decreased resulting in the drop in entropy, and thus, the kinetic energy of beads may not be sufficient to collide to form the larger bead. So, the combination of beads manifests the formation of rods, leading to the formation of further strong gel network .…”

Section: Resultsmentioning

confidence: 99%

Studies on rheological, thermal, and morphological properties of methylcellulose gel in aqueous medium

Singh¹,

Kundu

2019

Polymer Engineering & Sci

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The rheological, morphological, and thermal behavior of aqueous methylcellulose (MC) gels was investigated by optical microscope, dynamic mechanical analyzer (DMA), and differential scanning calorimeter. The double crossover between the storage modulus and loss modulus during the frequency scan in DMA suggests the transition from gel to sol state. These gel networks are comprised of bead-rod structures, which is visible under the optical microscope. Furthermore, the degelation mechanism of gels comprises of the thermodynamic viable bead burst phenomenon. The reheated samples of MC under dynamic compression show partial irreversibility of the MC aqueous system, indicating the possible presence of weakly coupled random coils and helix. The phenomenon of turbidity of MC aqueous gels is discussed with the help of a large bead model, in which the small-sized beads present in aqueous solution collide with each other to form large beads. FIG. 4. (a) Plot between storage and loss modulus as a function of frequency Hz for 5 wt% MC-4000 gel at 50 C. (b) Plot between storage and loss modulus as a function of frequency Hz for 5 wt% MC-1500 gel at 50 C. (c) Plot between storage and loss modulus as a function of frequency Hz for 5 wt% MC-4000 gel at 80 C. (d) Plot between storage and loss modulus as a function of frequency Hz for 5 wt% MC-1500 gel at 80 C. (e) Plot between storage and loss modulus as a function of frequency Hz for 5 wt% MC-25 gel at 80 C. [Color figure can be viewed at wileyonlinelibrary.com]

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Section: Resultsmentioning

confidence: 99%

Studies on rheological, thermal, and morphological properties of methylcellulose gel in aqueous medium

Singh¹,

Kundu

2019

Polymer Engineering & Sci

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“…In the past few decades, the natural nontoxic biodegradable polymers like cellulose, carboxymethyl cellulose, chitosan, etc. have attracted the attention of the researchers for their applications in controlled release of drugs and growth hormones in plants 8,9 . Chitosan is a derivative of chitin, a biopolymer found in the aquatic as well as terrestrial organisms such as shrimps, crabs, crustaceans, arthropod prawns, mushrooms, and fungi 10 .…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic chitosan/acrylic acid/thiourea based semi‐interpenetrating hydrogel: Solvothermal synthesis and evaluation for controlled release of organophosphate pesticide, triazophos

Bhullar

Rani

Kumari

et al. 2021

J of Applied Polymer Sci

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The current study reports the solvothermal synthesis of amphiphilic chitosan-based semi-interpenetrating (CAT-SIPH) hydrogel for controlled release of an organophosphate pesticide, triazophos. CAT-SIPH is prepared from natural backbone polymer chitosan (CS) and monomer, acrylic acid (AA) employing initiator (K 2 S 2 O 8), and cross-linker, thiourea (CSN 2 H 4) using solvothermal technique under 7 Psi pressure in an autoclave. The polymerization reaction variables like reaction time, the volume of solvent, concentration of initiator, cross-linker, and monomer are optimized to get the best product yield in terms of percentage grafting. The optimized conditions for solvothermal polymerization reaction carried out for 60 min are solvent volume (10 ml), concentrations of acrylic acid (0.2 mol/L), K 2 S 2 O 8 (0.45 × 10 −2 mol/L) and thiourea (1.75 × 10 −4 mol/L). The swelling behavior of CAT-SIPH hydrogel synthesized under optimized conditions is studied in the terms of swelling ratio. CAT-SIPH is characterized by Fourier transform infrared spectra (FT-IR), I HNMR, thermal analysis (TA), Zeta potential, and scanning electron microscopy (SEM). The potential of cross-linked hydrogel CAT-SIPH for controlled release of an organophosphate pesticide, Triazophos on to sandy loam soil is assessed. The experimental investigations proved that synthesized hydrogel can be effectively employed as a pesticide carrier for controlled release on to loamy soil as the maximum release (53%) is observed even after 25 days at pH 6 and value get lowered under acidic and basic conditions. The present investigation demonstrated the potential of chitosan-based CAT-SIPH hydrogel as a pH-responsive release vehicle for agrochemicals onto the soil matrix and offers a potential solution for the prevention of surface and groundwater contamination.

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Rheological and micro structural studies of methylcellulose solutions in N,N-dimethylformamide for preparation of extruded beads: controlled urea release

Singh¹,

Kundu

2017

Rheol Acta

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Controlled Release of Urea Through Mesoporous Methylcellulose Films Derived FromN,NDimethyl Formamide

Cited by 9 publications

References 25 publications

Studies on rheological, thermal, and morphological properties of methylcellulose gel in aqueous medium

Studies on rheological, thermal, and morphological properties of methylcellulose gel in aqueous medium

Amphiphilic chitosan/acrylic acid/thiourea based semi‐interpenetrating hydrogel: Solvothermal synthesis and evaluation for controlled release of organophosphate pesticide, triazophos

Rheological and micro structural studies of methylcellulose solutions in N,N-dimethylformamide for preparation of extruded beads: controlled urea release

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