Influence of pectin as a green polymer electrolyte on the transport properties of Chitosan-Pectin membranes
PASINI CABELLO, S.D.
MOLLÁ ROMANO, SERGIO
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Novel blend membranes have been prepared from Chitosan (CH), Pectin (PEC) and their mixtures. The obtained samples were cross-linked and sulfonated before characterization. The results show that CH/PEC membranes display structural changes on the chemical and physical properties as a function of composition. DSC analysis reveals an endothermic peak due to the scission of the ionic pairs between carboxylic groups and ammonium groups, which produces a strong change on physical properties such as methanol permeability and proton conductivity. The methanol permeability decreases with the amount of Pectin from (4.24 ± 0.04) × 10−6 cm2/s for pure Chitosan membrane to (1.51 ± 0.03) × 10−6 cm2/s for blend CH/PEC membranes when the amount of Pectin is 50% (v/v). The proton conductivities of the blend membranes follow a similar behavior. For a pure CH membrane the conductivity is 2.44 × 10−3 S/cm, decreasing with pectin content until the composition 50/50 (v/v), in which the conductivity drops almost one order of magnitude. © 2016 Elsevier Ltd
blending; chitin; chitosan; crosslinking; differential scanning calorimetry; electrolytes; membranes; methanol; physical properties; polyelectrolytes; proton conductivity; proton exchange membrane fuel cells (pemfc); blend membranes; carboxylic group; chemical and physical properties; chitosan membrane; electrochemical techniques; endothermic peaks; methanol permeability; polymer electrolyte membranes