Non-isothermal dehydration kinetics of acrylic ion-exchange resins

Chambré, Dorina; Iditoiu, C.; Segal, E.

doi:10.1007/s10973-006-8042-z

Cited by 11 publications

(1 citation statement)

References 8 publications

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“…The second step up to 282.1 °C (maximum decomposition rate at 237.8 °C) with a mass loss of 11.1% can be assigned to the water elimination between two neighboring carboxylic groups with the creation of some polyacrylic cyclic anhydrides by intermolecular dehydration (5-atom ring such as succinic anhydride type or 6-atom ring such as glutaric anhydride type, Scheme 2 ). The third step up to 446.2 °C (maximum decomposition rate as much as 16.8%/min at 416.2 °C) with a mass loss of 58.4% is the most intense transformation in this experiment, and this is a decarboxylation process of the previously dehydrated structure (polyanhydride decomposition through decarboxylation and elimination of CO 2 and CO) [ 61 , 62 , 63 , 64 , 65 ]. The last decomposition step up to 503.8 °C corresponded to the oxidative degradation (combustion) of polymeric matrix when oxygen (~20.8% volume) interacts with the hydrocarbon chain and its degradation products.…”

Section: Resultsmentioning

confidence: 99%

Copper Rich Composite Materials Based on Carboxylic Cation Exchangers and Their Thermal Transformation

et al. 2021

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The effect of a cupric deposit (Cu2+, CuO) on the thermal decomposition of carboxylic cation exchangers (CCEs) is not known, and such studies may have practical significance. CCEs have a very high ion exchange capacity, so an exceptionally large amount of CuO (which is a catalyst) can be precipitated inside them. Two CCEs, macroreticular (Amberlite IRC50) and gel-like (Amberlite IRC86), served as a polymeric support to obtain copper-rich hybrid ion exchangers. Composites with CuO particles inside a polyacrylic matrix (up to 35.0 wt% Cu) were obtained. Thermal analyses under air and under N2 were performed for CCEs in the H+ and Cu2+ form with and without a CuO deposit. The results of sixteen experiments are discussed based on the TG/DTG curves and XRD patterns of the solid residues. Under air, the cupric deposit shifted the particular transformations and the ultimate polymeric matter decomposition (combustion) toward lower temperatures (even about 100–150 °C). Under N2, the reduction of the cupric deposit to metallic copper took place. Unique composite materials enriched in carbonaceous matter were obtained, as the products of polymeric matrix decomposition (free radicals and hydrogen) created an additional amount of carbon char due to the utilization of a certain amount of hydrogen to reduce Cu (II) to Cu0.

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