Storage modulus of hydrogel

What is the storage modulus of a hydrogel?

The storage modulus of hydrogel increases with increasing polymer concentration. The hydrogel showed storage moduli of 200 and 400 Pa at 1.5% and 2% (w/v), respectively. Under these conditions, the loss modulus only increases from 12 to 18 Pa when increasing concentration.

What is the rheological behavior of a forming hydrogel?

The rheological behavior of the forming hydrogel is monitored as a function of time, following the shear storage modulus G′ and the loss modulus G'' (Fig. 1). The storage modulus G′ characterizes the elastic and the loss modulus G″ the viscous part of the viscoelastic behavior.

Do hydrogels display a constant storage and loss modulus?

Hydrogels displayed a constant storage and loss modulus in the tested stain range. Frequency sweep, in the 0.01–10 Hz interval at 0.1% constant strain, was then performed on the hydrogel samples. Seven experimental points were acquired per each frequency decade. Tests were performed at 37 °C in wet conditions.

How to determine the viscoelastic properties of hydrogels prepared under different conditions?

The frequency and amplitude of the vibration were adjusted to 100 Hz and 50 μm, respectively. From the dynamic mechanical analysis, we determined the storage modulus (G ′), loss modulus (G ″) and loss factor (tan δ = G ″/ G ′) to evaluate the viscoelastic properties of the hydrogels prepared under various conditions.

What is the elastic modulus of hydrogels?

The elastic modulus of this formulation of hydrogels has values of 0.1–1.0 MPa, two to three orders of magnitude higher than previously reported for the natural polymer counterpart, with a water content of up to 90 wt% ( Gong, 2010, Kawauchi et al., 2009, Tanaka et al., 2005).

How do hydrogels affect mechanical properties?

We initially use a basic hydrogel model to clarify the influences of the molecular structure and swelling or deswelling on the mechanical properties, encompassing the elastic modulus, extensibility, strength, toughness and fatigue resistance.