Thermal stability of ionene polymers

Autor(es)

Campos, Valquiria ^{[1, 2]} ; Dweck, Jo ^[3] ; Nascimento, Claudio A. O. ^{[4, 5]} ; Tcacenco, Celize M. ^[6]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Ctr Environm Res & Training CEPEMA, Sao Paulo - Brazil

^[3] Univ Fed Rio de Janeiro, Sch Chem, Rio De Janeiro, RJ - Brazil

^[4] Univ Sao Paulo, Polytech Sch, Dept Chem Engn, Sao Paulo - Brazil

^[5] Ctr Environm Res & Training CEPEMA, Sao Paulo - Brazil

^[6] UNIFIEO, Ctr Chem Studies, Osasco, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. 112, n. 3, p. 1221-1229, JUN 2013.
• Citações Web of Science: 3

Resumo

Two different cationic polymers of the same chemical type and with very similar chemical structures were reacted with a natural bentonite over a wide range of polymer/clay ratios. This study involved the synthesis of cationic aliphatic ammonium polyionenes, specifically 3,6-ionene and 3,6-dodecylionene. Ionenes are ion-containing polymers that contain quaternary nitrogen atoms in the main macromolecular chain as opposed to a pendant chain. The CHN content, basal spacing, and elemental composition of each of the polymer-clay complexes were analyzed by X-ray diffraction, X-ray fluorescence, and thermogravimetry. All the polycations reacted to form interlayer complexes with clay, which displaced more Na+ and little Ca2+. Sodium and calcium were both present as interlayer cations in the clay and its complexes. The TG/DTG curves show that both polymers underwent thermal degradation in more than one stage. Specifically, 3,6-ionene was found to undergo two stages of decomposition and 3,6-dodecylionene undergo three stages. The behavior of the TG/DTG curves and the activation energy values suggest that 3,6-dodecylionene (E = 174,85 kJ mol(-1)) complexes have greater thermal stability than 3,6-ionene (E = 115,52 kJ mol(-1)) complexes. The mechanism of degradation suggests a direct interaction with the dodecyl chain containing 12 carbons, which are present in 3,6-dodecylionene but not in 3,6-ionene. (AU)

• Processo FAPESP: 10/01287-3 - Remoção de produtos de petróleo por meio de sistemas reativos
• Beneficiário: Valquiria de Campos
• Modalidade de apoio: Auxílio à Pesquisa - Regular