Storage modulus high frequency noise

Do storage and loss moduli depend on frequency?

It can be seen that both storage and loss moduli exhibit a weak power-law dependence on frequency in the low-frequency range, and the storage modulus tends to a constant, while the loss modulus becomes linearly proportional to frequency in the high-frequency range. These results are consistent with Eqs. 7 and 10.

What is the ratio of loss modulus to storage modulus?

The ratio of loss modulus to storage modulus δ = G ″/ G ′ is defined as the loss tangent. In lower-frequency ranges, the storage and loss moduli exhibit a weak power-law dependence on the frequency with similar power-law exponents, as reported in our model and many experiments (4, 6 – 10, 17). We can thus define δ at low frequencies as

Does a loss modulus predominate a storage modulus during a frequency sweep?

Indeed, the loss modulus of samples predominates the storage modulus during frequency sweep. It should be noted that both storage and loss moduli transect at a small frequency, owing to the distortion relaxation of PEO droplets in the incessant PLA medium .

What is the difference between loss tangent and storage modulus?

As the frequency increases (region II), the loss modulus G ″ shows a greater power-law dependence on frequency than the storage modulus G ′. When the frequency is sufficiently high, the loss tangent δ > 1 (region III), and the loss modulus shows a greater power-law dependence on frequency, while the storage modulus converges to a constant.

Does a complex modulus exhibit a weak power-law dependence at low frequencies?

Therefore, at low frequencies, the complex modulus of the entire cell (the 3rd-level hierarchy) exhibits a weak power-law dependence on the frequency with the power-law exponents of its storage and loss moduli being approximately equal, as in our previous work (24).

Why does the storage modulus drop at the miscible section?

Actually, the storage modulus drops at the miscible section, however the high elasticity nearby the mixing - demixing temperature causes a sudden change in the storage modulus , . Accordingly, the rheological measurements are accurate and applicable to characterize the phase separation and morphology of polymer products.