Investigation of the thermal behavior of new silica-polymer anion exchangers

Abstract

The thermal properties of new anion exchangers consisting of silica core and organic layers grafted onto their surface were evaluated by thermogravimetry and differential scanning calorimetry. The anion exchangers were prepared by chemical modification of bare silica gel. The support was coated with polymeric layers formed by condensation polymerization of primary amines with diepoxides. Synthesized copolymers of methylamine and 1,4-butanedioldiglycidyl ether have a dendrimer structure. By TG/FTIR/MS, it was observed that silica-layered materials exhibited two stages of mass loss: first with T max1 160°C, connected with desorption of water molecules from the adsorbents surface, and then with T max2 390°C, connected with degradation of organic layers.

Thermal characterization of polymeric anion exchangers with a dendrimeric structure

“…Their synthesis and properties were presented earlier [21]. The following reagents were used for the chemical modification of the polymer support material: methylamine (MA, 40 % in H 2 O, v/v) and 1,4-butanediol diglycidyl ether (BDDE, 95 % in H 2 O, v/v).…”

“…In this type of synthesis, the tertiary amine and quaternary ammonium groups are formed, which are anion exchange centers when they are used in IC. In our previous papers, we have reported on the synthesis, application, and thermal properties of the new type of anion exchangers based on silica [21]. Our new conception was to obtain anion exchangers based on 1,4 DMH-TRIM polymeric microspheres [22].…”

Impact of adsorption of poly(aspartic acid) and its copolymers with polyethylene glycol on thermal characteristic of Cr2O3

“…The interactions between various polymers and the solid particles using the thermogravimetric methods are subject of numerous research [38][39][40][41][42][43][44][45][46][47][48][49][50]. Figures 7-10 present the TG, DTA and DTG curves for the chromium (III) oxide samples, both unmodified and modified with the adsorption layer formed by the analyzed homo-and copolymers.…”

Pyrolysis of cyclo-aromatic diesters

“…This technique measures the mass loss as a function of temperature or time. It allows understanding the thermal degradation pathways and degradation kinetics of polymers, organic or inorganic compounds [1][2][3][4][5][6][7]. Also, it makes it possible to study the evaporation process, product and component stability, and changes in component properties during heating in inert or oxidative atmospheres, which is a necessary knowledge in order to find the practical applications of many compounds.…”