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Thermo sensitive behavior of cellulose derivatives in dilute aqueous solutions: From macroscopic to mesoscopic scale

“…The relative larger values of k H for MC and MHPC (i.e. about 1) as compared to HPC (about 0.5) determined below the thermal transition, can be attributed to a poorer aqueous solvent [34] for the methyl groups.…”

“…Furthermore, surface tension measurements showed a synergy between MHPC and several sulfonic acid salt surfactants at very low concentrations to form clusters [33]. Effect of substitution degree in LCST groups has been studied [34]. Finally, rheological behavior of MC and j-carrageen mixed systems has been also reported [35].…”

Influence of Anomeric Configuration on Mechanochemical Degradation of Polysaccharides: Cellulose versus Amylose

“…We believe this is the first report regarding the ultrasonic degradation of underivatized cellulose and amylose. A number of studies have examined the ultrasonic degradation of derivatives of both these polysaccharides, noting the effect that varying the substituents has on both M lim and the rate of degradation. – Unfortunately, the same derivatives of starch and cellulose do not appear to have been examined as part of the same study; that is, the experiments had more than one variable, unlike the experiments presented here, where anomeric configuration is the only variable. As such, the studies involving cellulose/amylose derivatives, while interesting for a variety of reasons, do not provide data sets that can be compared to the cellulose/amylose data sets we obtained.…”

Polymer weight determination from numerical and experimental data of the reduced viscosity of polymer in brine

“…It is well known that the radius of gyration (R g ) of a polymer is proportional to a power-law of its molecular weight. As an example: R g ∝ M γ , where γ ∈ (0.37, 0.43) for globular proteins [22], γ ∈ 0.56 for cellulose [23], and γ ∈ (0.50, 0.59) for flexible polymer chains in a good solvent [24]. However, another empirical expression for the radius of Table II. gyration as a function of the molecular weight can be deduced from Fig.…”

“…Although ionic polymers and their synthesis methods are well known and new structures are in continuous development, their theoretical understanding is still an innovative area. The molecular weight dependence is revealed in the classical Fox-Flory equation [16][17][18], where the connection between total number density of polymers and the unperturbed radius of gyration of polymer is also given [19][20][21][22][23][24].…”