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Physically assembled gels have promising applications in many fields becauseof their tunable mechanical properties. Here, we report the mechanicalproperties as a function of polymer volume fraction ($\phi$) for a physical gelsystem consists of poly(styrene)-poly(isoprene)-poly(styrene) [PS-PI-PS] inmineral oil. The PI-block molecular weight is higher than the entanglementmolecular weight, which leads to the entanglement of PI-blocks at higher$\phi$. The micellar microstructure for all gels results in a similar stressrelaxation mechanism, as captured by the superposition of stress-relaxationresults. Tensile testing experiments reveal a strain-rate dependence mechanicalresponse for the entangled gels. To capture the critical energy release rate($\Gamma_0$) over a range of $\phi$, both cavitation rheology and fractureexperiments were performed and we obtain $\Gamma_0\sim\phi^{2.0}$. The gelmoduli scale with the volume fraction as $\phi^{2.39}$, where the exponent islikely dictated by the change in loop-to-bridge fraction with increasing$\phi$.

Probing Large Deformation and Fracture Behavior of Physically Assembled Gel System by Varying Polymer Concentration