Thermogravimetric analysis of some crosslinked acrylamide copolymers and ion exchangers

Vlad, Cristina Doina; Dinu, Maria Valentina; Drăgan, Ecaterina Stela

doi:10.1016/s0141-3910(02)00268-9

Cited by 15 publications

(18 citation statements)

References 15 publications

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“…The occurrence of the second and third stages, referred to as depolymerisation in the current analysis, of the monolith could be attributed to the fact that the polymer synthesis proceeded with two homopolymeric compounds as monomers. This observation is in good agreement with the previous experiment by Vlad et al where they confirmed the impact of different cross‐linkers on the thermal stability and degradation of acrylamide copolymers.…”

Section: Resultsmentioning

confidence: 73%

Parametric investigation of polymethacrylate monolith synthesis and stability via thermogravimetric characterisation

Acquah

Moy

Anwar

et al. 2017

Asia-Pacific J Chem Eng

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Polymethacrylate monoliths are synthetic adsorbents with macroporous and mesoporous interconnected channels that can be engineered to target the hydrodynamic features of a wide range of molecular species. However, rigorous study into the effect of synthesis conditions on their thermal stability is limited. This work attempts to characterise the influence of key synthesis process variables on the stability of polymethacrylate monoliths using thermogravimetric analysis at a heating rate of 10°C/min. Experimental results showed that the thermal stability of polymethacrylate monoliths increased with decreasing polymerisation temperature from 85 to 65°C. Increasing the total porogen (P) to monomer (M) ratio increased the thermal stability of the monolith by >62% and >50% for P40/M60-P60/M40 and P60/M40-P80/M20, respectively. The impact of the initiator concentration, monomer variation, biporogen ratio, washing and activation of the monoliths was investigated. Nuclear magnetic resonance analyses conducted confirmed the hydrolysis of epoxy moieties on the monolith.

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Section: Resultsmentioning

confidence: 73%

Parametric investigation of polymethacrylate monolith synthesis and stability via thermogravimetric characterisation

Acquah

Moy

Anwar

et al. 2017

Asia-Pacific J Chem Eng

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“…Valuable information on the structure of the soluble polyelectrolytes53 and of the ion exchangers was obtained by TGA 54. Some samples of SBAE were also characterized by dynamic thermogravimetry (TG) and derivative thermogravimetry (DTG) because a high thermal stability is one of the main characteristics of the anion exchangers suitable for the chemical‐enrichment process of uranium.…”

Section: Resultsmentioning

confidence: 99%

Ion‐exchange resins. III. Functionalization–morphology correlations in the synthesis of some macroporous, strong basic anion exchangers and uranium‐sorption properties evaluation

Drăgan¹,

Avram²,

Axente

et al. 2004

J. Polym. Sci. A Polym. Chem.

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The synthesis and characterization of a series of macroporous, strong basic anion exchangers (SBAEs), with an average pore radius higher than 50 nm, and the evaluation of their sorption properties for uranyl chlorocomplexes from HCl solutions are reported. Finely divided macroporous styrene–divinylbenzene (S–DVB) copolymers with a narrow distribution of beads sizes, diameters within the range of 90–200 μm, were prepared for this purpose with 2‐ethyl‐1‐hexanol as a porogen, at a high dilution of monomers (D ≥ 0.55 mL/mL). Chloromethyl groups were introduced with (CH2O)n/Me3SiCl as a chloromethylation agent in the presence of a Lewis acid as a catalyst (TiCl4, SnCl4, and FeCl3) in CHCl3 as a reaction medium. SnCl4 and FeCl3 gave comparable chloromethylation degrees in the same reaction conditions. TiCl4 was not efficient as a catalyst in the chloromethylation with this reagent. Diethyl‐2‐hydroxyethylamine was used as a tertiary amine to prepare SBAEs. Structural and morphological characteristics were determined after every functionalization step of the macroporous network. Both the chloromethylation, in the presence of FeCl3 as a catalyst, and the amination reactions determined a significant decrease of the pore volume, in the whole range of the nominal crosslinking degree, comparative with the starting copolymer. The specific surface area and the average pore radius varied in a different way as a function of the nominal crosslinking degree. Thus, the specific surface area increased and the average pore radius decreased after chloromethylation and amination for copolymers with a DVB content lower than 10 wt %. Small decreases of the specific surface area and the average pore radius were observed after chloromethylation and amination reactions for copolymers with a DVB content higher than 10 wt %. SBAEs were also characterized by thermogravimetric analysis and sorption capacity for uranyl chlorocomplexes. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 2451–2461, 2004

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“…The characteristic temperatures and the weight losses of the main decomposition step are collected in Table V. A detailed thermogravimetric study of the starting AA copolymers and the corresponding ion exchangers, with respect to the structural parameters, has been published elsewhere 18…”

Section: Resultsmentioning

confidence: 99%

Ion‐exchange resins. II. Acrylamide crosslinked copolymers as precursors for some ion exchangers

Drăgan¹,

Dinu²,

Vlad³

2003

J of Applied Polymer Sci

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Crosslinked copolymers of acrylamide (AA) and ethylacrylate and some ion exchangers derived from them containing either primary amine groups, obtained by the Hofmann degradation of the amide groups, or carboxylic groups, obtained by the alkaline hydrolysis of the ester groups, were studied. Divinylbenzene and N,NЈ-methylenebisacrylamide were used as crosslinkers. The starting copolymers and the corresponding ion exchangers were characterized by IR spectroscopy, swelling behavior, and thermogravimetric analysis. The ion-exchanger properties were correlated with the crosslinker nature and the chemical reactions performed on the AA copolymers. The average molecular weight between two crosslinks, determined from the swelling data in water, was compared with that calculated on the basis of the copolymerization stoichiometry only for the carboxylic cation exchangers. In this way, the preservation of the crosslink density after the hydrolysis was revealed.

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Thermogravimetric analysis of some crosslinked acrylamide copolymers and ion exchangers

Cited by 15 publications

References 15 publications

Parametric investigation of polymethacrylate monolith synthesis and stability via thermogravimetric characterisation

Parametric investigation of polymethacrylate monolith synthesis and stability via thermogravimetric characterisation

Ion‐exchange resins. III. Functionalization–morphology correlations in the synthesis of some macroporous, strong basic anion exchangers and uranium‐sorption properties evaluation

Ion‐exchange resins. II. Acrylamide crosslinked copolymers as precursors for some ion exchangers

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