The study of non-isothermal degradation of acrylic ion-exchange resins |
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| Authors: | Dorina Chambree Cornelia Idi?oiu E Segal A Ces´ro |
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| Institution: | (1) Research Centre of Chemistry and Technology, Faculty of Food and Environment Engineering, University 'Aurel Vlaicu' of Arad, Bd. Revoluţiei 81, 2900 Arad, Romania;(2) Research Centre of Chemistry and Technology, Faculty of Food and Environment Engineering, University 'Aurel Vlaicu' of Arad, Bd. Revoluţiei 81, 2900 Arad, Romania;(3) University of Bucharest, Faculty of Chemistry, Bd. Elisabeta 4-12, Bucharest, Romania;(4) Laboratory of Physical and Macromolecular Chemistry, BBCM Department, University of Trieste, I-34127 Trieste, Italy |
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| Abstract: | Summary The thermal behavior under non-isothermal conditions of some low-acidity carboxylic cationites with acrylic-divinylbenzene
(DVB) matrix was investigated in air and nitrogen atmosphere up to 600°C. Thermal analysis (TG/DTG) combined with Mass Spectrometry
(MS) and Fourier Transform Infrared Spectroscopy (FTIR) was used to characterize the resins decomposition steps and the degradation
products. Five decomposition steps were observed. The first step is due to elimination of osmotic and bound water. The second
decomposition step is due to dehydration of neighboring (-COOH) groups. The third and fourth mass-loss steps correspond to
decarboxylation of the polyanhydrides and to some depolymerization of the polymeric matrix. The last decomposition step is
associated with total degradation of the polymeric matrix. The shape and the temperature for each decomposition steps depend
on the experimental conditions (heating rate and degradation atmosphere) and on the sample properties (i.e. granulation, cross-linking
degree, porosity and physical form). |
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| Keywords: | FTIR thermal analysis TG/DTG MS carboxylic cationites cationite thermal behavior polyacrylic resins |
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