Physicochemical Changes of Alginate and Polyacrylate Mixture Induced by Interactions of the Appended Units

Leontieş, Anca Ruxandra; Băran, Adriana; Ioniţă, Gabriela; Matei, Iulia; Mocanu, Sorin; Baratoiu, Rodica Daniela; Hristea, Elena; Aricov, Ludmila

doi:10.1002/macp.202200444

Cited by 2 publications

(1 citation statement)

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“…Similarly, we used EPR spectroscopy to evidence the host–guest interactions in solutions of polyacrylic acid functionalized with alkyl chains or adamantyl (guest) moieties and alginate functionalized with cyclodextrin (host) units. We found that the host–guest interactions between the appended units diminish the repulsive forces between the anionic polymers and influence the formation of inter-coils of polyacrylic acid [ 22 ]. By using the same approach, in this study, we aim to link the local information provided by EPR measurements with the overall properties of the alginate/chitosan systems that can be obtained by rheological measurements and IR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Formation of Alginate/Chitosan Interpenetrated Networks Revealed by EPR Spectroscopy

Joly

Aricov

Balan

et al. 2023

Gels

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This study analyzes the physico-chemical properties of interpenetrated polymer networks (IPNs) and semi-IPN resulting from cross-linking chitosan with glutaraldehyde and alginate with Ca2+ cations, as a function of the order in which the cross-linking agents are added to the polymer mixture. Three physico-chemical methods were used to assess the differences between systems: rheology, IR spectroscopy, and electron paramagnetic resonance (EPR) spectroscopy. While rheology and IR spectroscopy are commonly used to characterize gel materials, EPR spectroscopy is rarely used, but has the advantage of providing local information about the dynamics of a system. The rheological parameters, which describe the global behavior of the samples, show that semi-IPN systems have a weaker gel behavior and the order of introducing the cross-linker in the polymer systems plays a role. The IR spectra of samples resulting by adding only Ca2+ or Ca2+ as the first cross-linker are similar to that of the alginate gel, while the spectra of samples in which glutaraldehyde is firstly added resemble the chitosan gel spectrum. Using spin-labeled alginate and spin-labeled chitosan, we monitored the changes occurring in the dynamic of the spin labels due to the formation of IPN and semi-IPN. The results show that the order of adding the cross-linking agents influences the dynamic of the IPN network, and that the formation of the alginate network determines the characteristics of the entire IPN system. The EPR data were correlated with the rheological parameters and IR spectra of the analyzed samples.

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Section: Introductionmentioning

confidence: 99%