Spectra of Internal Friction in Polyethylene

The study of spectra of internal friction [Formula: see text] and temperature dependencies of frequency of freely damped [Formula: see text] oscillatory process excited in investigated samples of polyethylene with different degree of crystallinity in the temperature range from −150 [Formula: see text] C to +150 [Formula: see text] C. It is established that four local dissipative processes of different intensity shown in different temperature intervals are observed on the spectra [Formula: see text]. These are [Formula: see text] , [Formula: see text] , [Formula: see text] , [Formula: see text] processes. The theoretical analysis of the relationship between the anomalous changes of the vibrational process frequency [Formula: see text] and the shift modulus defect [Formula: see text] and the internal friction mechanisms for each of the dissipative loss processes detected on the spectrum [Formula: see text] is carried out. The influence of supramolecular structures on local dissipative [Formula: see text] process in polyethylene is estimated.