The experimental results and theoretical analysis show that the high-temperature internal friction peak is evolved into an "ordinary peak" and an "inverted peak" in the alloy in the case of lower frequencies,more martensite plates and higher heating rates,which arise from the interaction between two types of martensitic variants with positive and negative loss elastic modulus.

It was concluded that the elastic modulus G′, loss modulus G″ and dynamic viscosity η~ of PLA and its copolymers increases with the increasing of the molecular weight.

As an application,the scaling exponents of elastic modulus and loss modulus are also obtained.

The effects of the mass concentration and the salinity and the shear angular frequency of the polymer solution on its loss modulus and storage modulus are studied.

Experiment on dynamic shear was carried out, obtaining relationship of composite modulus, loss modulus and storage modulus following change of frequency, getting the relationship of frequency and equivalent point of loss modules and storage modules.

Then frequency scanning experiment was carried out for studying the relationship of storage modules G’, loss modules G" and frequency, for getting the influence of storage modules G’, loss modules G" by frequency in different concentrations and salinities,influence of viscoelasticity equivalent point by frequency in different concentration and salinity and the relationship of G’/G" and frequency.