Thermal stability of ionene polymers
Journal of Thermal Analysis and Calorimetry, v. 112, n. 3, p. 1221-1229, 2013.
Nascimento, Cláudio A. O.
Tcacenco, Celize M.
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. © 2012 Akadémiai Kiadó, Budapest, Hungary.
Showing items related by title, author, creator and subject.
Structural properties of buried conducting layers formed by very low energy ion implantation of gold into polymer Teixeira, Fernanda de Sá; Salvadori, Maria Cecilia Barbosa da Silveira; Cattani, Mauro Sergio Dorsa; BROWN, I. G. (AMER INST PHYSICS, 2009)We have investigated the fundamental structural properties of conducting thin films formed by implanting gold ions into polymethylmethacrylate (PMMA) polymer at 49 eV using a repetitively pulsed cathodic arc plasma gun. ...
Almgren, Mats; Borné, Johanna; Feitosa, Eloi; Khan, Ali; Lindman, Björn
Moraes, Francine S.; Rangel, Elidiane C.; Lopes, Patrícia S.; Durrant, Steven F.; Cruz, Nilson C.