Journal
CHEMICAL AND PROCESS ENGINEERING-INZYNIERIA CHEMICZNA I PROCESOWA
Volume 40, Issue 2, Pages 207-212Publisher
POLSKA AKAD NAUK, POLISH ACAD SCIENCES
DOI: 10.24425/cpe.2019.126113
Keywords
sol-gel phase transition; chitosan hydrogels; rheometry measurements; oscillatory shear; rotational shear
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Funding
- Faculty of Process and Environmental Engineering of Lodz University of Technology
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This paper discusses the influence of the direction of applied deformation on the ability to gelation of thermosensitive chitosan hydrogels. The application of the shear rate equal in value to the classically performed oscillatory measurements leads to significantly different shapes of experimental curves. It was found that the type of mechanically applied deformation has a significant impact on the gelation ability of colloidal chitosan solutions and conditions of sol-gel phase transition. Simple shear leads to a phase transition at a lower temperature or in a shorter time compared to oscillatory tests. Moreover, based on the final values of dynamic viscosity in rotational measurements, it was found that stronger crosslinking of the polymer structure was observed.
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