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H-bonding in entrapped water in poly(o-methoxyaniline): Results from a differential scanning calorimetry study
Authors:Nara C. de Souza  Josmary R. Silva  Osvaldo N. Oliveira Jr.
Affiliation:a Faculdade de Ciências e Tecnologia, Universidade Estadual Paulista, CP 467, 19060-900 Presidente Prudente, SP, Brazil
b Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970 São Carlos, SP, Brazil
Abstract:Differential scanning calorimetry (DSC) was used to investigate entrapped water in poly(o-methoxyaniline) (POMA) in powder form. Two endothermic peaks were attributed to removal of water molecules that were adsorbed with distinct energies. By obtaining thermograms at various heating rates, we succeeded in applying Kissinger's approaches to estimate activation energies for the water adsorbed. The values obtained were ca. 25 and 53 kJ/mol, which correspond to H-bonding interactions, probably at the amine and imine centers of POMA, respectively.
Keywords:Poly(o-methoxyaniline)   H-bonding   Entrapped water   Differential scanning calorimetry
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