caa a22 4500 463193067 CHVBK 20180406164914.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10973-006-7753-5 doi (NATIONALLICENCE)springer-10.1007/s10973-006-7753-5 Thermalanalysis of ammonium, mono-, di- and triethanolammonium alginates [Elektronische Daten] [Milena Segato, É. Cavalheiro] Thermal behaviour of ammonium (NH4alg), mono- (MEAalg), di- (DEAalg) and triethanolammonium (TEAalg) salts of alginic acid (Halg) was investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC). Salts were prepared by the direct reaction of alginic acid with the ammonium hydroxide and with the respective ethanolamines. After preparation the compounds were lyophilized during 24 h and characterized by FTIR spectroscopy and elemental analysis (C, H and N). Under air the compounds exhibited three successive thermal decomposition steps: dehydration, decomposition of the polymeric matrix and finally, burning of carbonaceous residue. Under nitrogen two steps (dehydration and decomposition) were observed. The stability order of this series of compounds was: TEAalg this series of compounds was: TEAalg<DEAalg<NH4alg<Halg≈MEAalg. DSC curves between -50 and 150°C did not show any thermal events suggesting that after lyophilization probably non-freezing type water is present in the system. Springer-Verlag, 2007 alginic acid nationallicence diethanolamine nationallicence DSC nationallicence monoethanolamine nationallicence TG nationallicence triethanolamine nationallicence Segato Milena Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400, CEP 13566-390, São Carlos, SP, Brazil aut Cavalheiro É. Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400, CEP 13566-390, São Carlos, SP, Brazil aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 737-741 1388-6150 87:3<737 2007 87 10973 https://doi.org/10.1007/s10973-006-7753-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7753-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Segato Milena Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400, CEP 13566-390, São Carlos, SP, Brazil aut NATIONALLICENCE 700 1- Cavalheiro É. Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador São-carlense, 400, CEP 13566-390, São Carlos, SP, Brazil aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 737-741 1388-6150 87:3<737 2007 87 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer