May 28, 2023
Hamed Salimi-Kenari

Hamed Salimi-Kenari

Degree: Assistant professor
Education: Ph.D in Polymer Engineering
Phone: 01135305105
Faculty: Faculty of Engineering and Technology


Title Effects of chain length of the cross-linking agent on rheological and swelling characteristics of dextran hydrogels
Type Article
Dextran hydrogels Chemical crosslinkers Rheology Swelling Percolated networks
DOI 10.1016/j.carbpol.2017.10.056
Researchers Hamed Salimi-Kenari (First researcher) , Faeze Mollaie (Second researcher) , Erfan Dashtimoghadam (Third researcher) , Mohammad Imani (Fourth researcher) , Bo Nyström (Fifth researcher)


Rheological characteristics during chemical gelation of semidilute solutions of dextran in the presence of crosslinking agents of different chain length are reported. Effects of cross-linker chain length on the gel point, structure of the gel network, and mechanical properties were investigated. The rheological results disclose that for all systems, the gelation process proceeds over a long time and both the complex viscosity and the power law exponent reveal that solid-like gel structures are formed in the post-gel region. Water absorption behavior of the gels was studied and the results were interpreted by using a kinetic model indicating that the swelling is diffusion controlled. The findings clearly show that the rheological characteristics, such as the time of gelation and gel strength of dextran hydrogels can be tuned by changing the chain length of the cross-linker agent. Furthermore, the swelling results also exposed significant differences between gels cross-linked with the two different crosslinker agents.