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- 저자 : Ratan Pal Singh (검색결과 1 건)
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Temperature-dependent rheological behaviour of methylcellulose nanocomposite organogels
Ratan Pal Singh 한국고분자학회 2023 Macromolecular Research Vol.31 No.1
The temperature-dependent gelation phenomenon of methylcellulose (MC) in the organic solvent N, N-Dimethyl formamide (DMF) is examined for various surfactants using dynamic mechanical analysis under compression technique. The peaks got in the dynamic strain experiment may represent the fluidity in the structure above 60 ℃. Upon further heating, there is an increase in the enthalpy, which involves the arbitrary vibration of free –OCH3 functional groups of MC, resulting in non-polar interactions to build a complex viscous liquid. A vast increment in dynamic strain value manifests the solubility of MC in DMF. During the Scanning electron microscopy (SEM) investigations of dry MC films, the entangled globules-rod conformations are seen. These conformations are capable of absorbing a large amount of energy before the rapture. The spring-like structure of these conformations encourages the MC-DMF gel regime to absorb energy and distribute it among the non-conformational sol–gel area. High storage modulus value signifies a higher crosslink density and a tendency to absorb more vibrational-thermal energy without disintegrating. We investigated the stability of these gels through computational studies, where the potential energy between a single surfactant molecule and the dimeric form of MC is calculated.
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