Přístupnostní navigace
E-application
Search Search Close
Publication detail
KADLEC, M. SMILEK, J. PEKAŘ, M.
Original Title
Study on the Relaxation Behaviour of Hydrogel Materials Using Classical Rheology Methods
Type
abstract
Language
English
Original Abstract
Proposed paper investigates relaxation behaviour of hydrogel materials using classical rheology methods as a part of the complex rheological characterization of these systems. Specifically, creep and recovery tests as well as three interval thixotropy tests were studied in this paper. Extensive optimization of these tests was carried out in order to find ideal measurement settings, which for creep tests consist in proper values of applied stress, temperature and duration of loading and relaxation step. the essential variables for three interval thixotropy tests are frequency of oscillation, temperature and applied strain as well as duration for each step. the optimization procedure was performed using 1 wt. % physically crosslinked agarose hydrogel and the tuned tests were applied besides other different concentrations of agarose hydrogel also to hyaluronic acid based hydrogels formed due to interactions between negatively charged polyelectrolyte groups with positively charged surfactants and to polyvinyl alcohol gels chemically crosslinked via borax. These samples were selected to cover a variety of hydrogels with mutually different crosslinking principle. Both experiments confirmed, the agarose gel proved to have the best ability to recover after deformation of all studied samples. Moreover, increasing agarose concentration and decrease in duration of deformation step led to better sample regeneration. On the other hand, the hyaluronic acid based hydrogel reported the worst relaxation properties. Although these results were comparable from both experiments, the percentage structural regeneration from each test was different. Hence, the complex relaxation characteristics cannot be defined using one of the mentioned tests alone and both the creep and the three interval thixotropy tests are highly beneficial in case of study of hydrogel materials‘ relaxation behaviour. Obtained results from this paper may lead to more precise description of deformation and relaxation characteristics, which are frequently occurring during treatment as well as application of hydrogel materials.
Keywords
Rheology, creep test, three interval thixotrpy tests, hydrogels
Authors
KADLEC, M.; SMILEK, J.; PEKAŘ, M.
Released
26. 11. 2020
Publisher
Vysoké učení technické v Brně, Fakulta chemická
Location
Brno
ISBN
987-80-214-5920-0
Book
Studentská odborná konference CHEMIE JE ŽIVOT 2020
Edition number
první
Pages from
84
Pages to
85
Pages count
2
BibTex
@misc{BUT172660, author="Martin {Kadlec} and Jiří {Smilek} and Miloslav {Pekař}", title="Study on the Relaxation Behaviour of Hydrogel Materials Using Classical Rheology Methods", booktitle="Studentská odborná konference CHEMIE JE ŽIVOT 2020", year="2020", edition="první", pages="84--85", publisher="Vysoké učení technické v Brně, Fakulta chemická", address="Brno", isbn="987-80-214-5920-0", note="abstract" }