Abstract
Polysaccharides are common ingredients in medical, technological and industrial products. In many formulations, the oppositely charged polysaccharides (two major biopolymers) are used simultaneously. Understanding their interactions can help control physical properties and stability of formulating. The excess conductivity, σE, and excess energy of activation (ΔΕσ)Ε of electrical conductivity have been investigated by using electrical conductivities measurements for solution of Sodium carboxymethylcellulose (CMC) + solution of chitosan (CH) mixtures over the entire range of volumes fractions X1 of CMC for three different temperatures. This system exhibited a very large negative value of σE and very large positive values (ΔΕσ)Ε due to increased hydrogen bonding interactions and correlation length between unlike molecules in the two critical regions, and very large differences between the pure components. The activations parameters ΔΗσ and ΔSσ have been also calculated, and show that the two critical regions have an important effect on the electrical conductivity properties. In this study, (ΔHσ)ϕ1, (ΔHσ)c ϕ1, (ΔHσ)ϕ2, (ΔHσ)c ϕ2, Xϕ1, Xϕ1, XC ϕ1 and XC ϕ2 were identified.
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