431797 Mechanical Properties of Ionically Crosslinked Alginate Gels

Thursday, November 12, 2015: 5:00 PM
251C (Salt Palace Convention Center)
Seyed Meysam Hashemnejad and Santanu Kundu, Dave C. Swalm School of Chemical Engineering, Mississippi State University, Mississippi State, MS

Polymer network and gels show nonlinear elastic responses under applied load. They may stiffen or soften under large deformation. The nonlinearity is related to the network structure, i.e. flexibility of chain and chain elongation ratio, crosslinking density, nature and length of crosslinking, and environmental conditions. Here, we investigate strain stiffening behavior of ionically cross-linked alginate hydrogel using large amplitude oscillatory shear (LAOS). The gels were obtained by using divalent calcium salt. Alginate volume fraction was kept constant (1 wt. %) and alginate to calcium ratio was varied to obtain gels with different crosslink density. The nonlinear rheological parameters are estimated from the stress responses to elucidate the strain stiffening behavior of the structure. The relationship between molecular structure and macroscopic elastic responses will be presented. Our results provide a better understanding on the deformation mechanism of ionic alginate gel under large deformation.

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See more of this Session: Biomacromolecular Gels
See more of this Group/Topical: Materials Engineering and Sciences Division