DSC and micro structural studies of methylcellulose gels in N, N dimethylformamide

Singh, Reeti; Kundu, Patit Paban

doi:10.1007/s10965-013-0226-1

Cited by 13 publications

(12 citation statements)

References 29 publications

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“…b and c). On the other hand, nanohelix‐like arrangements in MC‐DMF gel were observed during X‐ray diffraction (XRD) studies with crystallite size 54 and 15 nm . In aqueous MC gels, the size of helix observed during cryogenic transmission electron microscopy is similar (15 nm) to that of XRD results of above‐stated DMF gels .…”

Section: Resultsmentioning

confidence: 62%

“…Figure is the optical image, showing an amalgamation of two beads to form a single bead (10 m). On the other hand, the amalgamation of beads to form larger bead was not observed in MC‐DMF gels under optical microscope and SEM . In comparison to MC aqueous system, the gelation of MC‐DMF is due to polymer conformational changes during cooling.…”

Section: Resultsmentioning

confidence: 88%

“…On the other hand, the peak heights (in absolute scale) of MC‐25 and MC‐1500 are much higher than those of MC‐4000 and preheated MC‐4000. In comparison to the gels of MC‐4000, gels of MC‐25 and MC‐1500 consist of less number of helixes and junction zones; the presence of the number of beads and rods is even very few (high molecular weight has more helixes and junction zones) . The higher peak height indicates the requirement of higher strain, resulting from the penetration and attachment of dynamic strainer (probe) with the low strength gels of low‐molecular‐weight polymers (MC 25 and MC 1500) at a particular frequency.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, these polymer conformational changes are responsible for the formation of strong three‐dimensional (3D) network structures. The 3D network further consists of random coil‐helix and bead‐rod configurations, and these conformational networks were mathematically and statistically studied by many scientific groups . The Flory and Stockmayer model suggests the presence of active repeating units, which may form a bond with other active repeating units during the gelation process at a constant enthalpy.…”

Section: Introductionmentioning

confidence: 99%

“…The conformation of these networks was also studied by using small‐angle X‐ray scattering . Furthermore, the bead‐rod structure of MC in N , N ‐dimethylformamide was confirmed by optical microscopy and by scanning electron microscope (SEM) . Earlier, many studies have been conducted on the gel properties of MC organic/aqueous system, such as the gel temperature and gel strength using a dynamical mechanical analyzer (under shear and compression mode).…”

Section: Introductionmentioning

confidence: 99%

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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: 62%

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Singh¹,

Kundu

2019

Polymer Engineering & Sci

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Poly(Ionic) Liquid‐Enhanced Ion Dynamics in Cellulose‐Derived Gel Polymer Electrolytes

Paiva,

Klem,

Silvestre

et al. 2024

ChemSusChem

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Gel polymer electrolytes (GPEs) are regarded as a promising alternative to conventional electrolytes, combining the advantages of solid and liquid electrolytes. Leveraging the abundance and eco‐friendliness of cellulose‐based materials, GPEs were produced using methyl cellulose and incorporating various doping agents, either an ionic liquid (1‐Butyl‐1‐methylpyrrolidinium bis(trifluoromethylsulfonyl)imide [Pyr14][TFSI]), its polymeric ionic liquid analogue (Poly(diallyldimethylammonium bis(trifluoromethylsulfonyl)imide) [PDADMA][TFSI]), or an anionically charged backbone polymeric ionic liquid (lithium poly[(4‐styrenesulfonyl)(trifluoromethyl(S‐trifluoromethylsulfonylimino) sulfonyl) imide] LiP[STFSI]). The ion dynamics and molecular interactions within the GPEs were thoroughly analyzed using Attenuated Total Reflectance Fourier‐Transform Infrared Spectroscopy (ATR‐FTIR), Heteronuclear Overhauser Enhancement Spectroscopy (HOESY), and Pulsed‐Field Gradient Nuclear Magnetic Resonance Diffusion (PFG‐NMR). Li+ transference numbers (tLi+) were successfully calculated. Our study found that by combining slow‐diffusing polymeric ionic liquids (PILs) with fast‐diffusing lithium salt, we were able to achieve transference numbers comparable to those of liquid electrolytes, especially with the anionic PIL, LiP[STFSI]. This research highlights the influence of the polymer's nature on lithium‐ion transport within GPEs. Additionally, micro supercapacitor (MSC) devices assembled with these GPEs exhibited capacitive behavior. These findings suggest that further optimization of GPE composition could significantly improve their performance, thereby positioning them for application in sustainable and efficient energy storage systems.

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Novel Amphiphiles and Their Applications for Different Purposes with Special Emphasis on Polymeric Surfactants

et al. 2019

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Amphiphiles or surfactants are widely known for its reducing power of interfacial tension and extraordinary rheological properties. Among the various classes of surfactants gemini surfactants, biosurfactants and polymeric surfactants are remarkable and distinguishable among the others for their structural diversity and profitable usefulness. Primarily, the performance of any surfactant can be determined by HLB (Hydrophile Lipophile Balance) value, an empirical parameter. This review attempts to clarify some of the terminology used in literature by providing illustration of classification, features and diverse applications of different surfactants.

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DSC and micro structural studies of methylcellulose gels in N, N dimethylformamide

Cited by 13 publications

References 29 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

Poly(Ionic) Liquid‐Enhanced Ion Dynamics in Cellulose‐Derived Gel Polymer Electrolytes

Novel Amphiphiles and Their Applications for Different Purposes with Special Emphasis on Polymeric Surfactants

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