Publication detail

Study on the Relaxation Behaviour of Hydrogel Materials Using Classical Rheology Methods

KADLEC, M. SMILEK, J. PEKAŘ, M.

Original Title

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

Pages to

Pages count

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"
}