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Carboxyl Group - Springer Nature

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Last Updated: 15 January 2023

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Kinetic study of the thermal and thermo-oxidative degradations of aromatic poly(ether sulfone) random copolymers bearing pendant carboxyl groups

Different amounts of 4,4-u2032dihydroxydiphenyl, DPA, and a stoichiometric quantity of 4,4u2032-dichlorodiphenyl sulfone were synthesized from different amounts of 4,4u2032-dichlorodiphenyl sulfone, DPA, and stoichiometric displacement by nucleophilic aromatic displacement, synthesized from different amounts of 4,4u2032 The initial decomposition temperature of the prepared copolymer was found to be a good thermal conductor, but thermal stability testing was carried out in the meantime, showing caution as regards the proportion of functionalization setting the maximum temperature, which caused deterioration of the copolymer's physical characteristics at 30% of pendant carboxylic acid groups.

Source link: https://doi.org/10.1007/s10973-022-11881-9


Dye adsorption performance of nanocellulose beads with different carboxyl group content

As a natural polymer, cellulose has low cost, degradability, and high biocompatibility. Nanocellulose with different carboxyl content can be prepared in this project, which is expected to be a good high-efficiency cationic adsorbent due to its high in hydroxyl groups on the surface and negatively charged. The calcium chloride solution was used as the cross-linking agent to produce TEMPO-oxidized cellulose nanofibril beads by the dropping solidification method. As the number of carboxyl groups rises, the Zeta potential value of the nanocellulose dispersion became increasingly negative. With the increase of carboxyl group content, the specific surface area of the methylene blue adsorption capacity has also increased. TOCNB's saturated adsorption capacity on MB was estimated as high as 925. 93 mg gu22121.

Source link: https://doi.org/10.1007/s10570-022-04964-1


Glycine derivatives with closed carboxyl group as effective co-initiators for radical photopolymerization in the presence of camphorquinone

Unlike NPG's free carboxyl group, we found that many glycine derivatives with closed carboxyl groups as co-initiators could compete or even perform better than NPG in initiating photopolymerization in the presence of camphorquinone, while free carboxyl groups were ineffective, while the correspondings with free carboxyl groups were ineffective. The effects of pH values of formula on co-initiation behaviours were investigated. NPG underwent decarboxylation to produce radical species, but hydrogen-abstraction on a-methylene was the only viable alternative, which were confirmed by 1H NMR spectra, ESR spectra, and polymerization experiments, although the experimental derivatives led to sterically blocked radicals only by hydrogen-abstraction on a-methylene.

Source link: https://doi.org/10.1007/s00289-022-04074-9

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions