Spectra of Internal Friction in Polyethyleneстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 апреля 2022 г.
Аннотация:The study of spectra of internal friction λ=f(T) and temperature dependencies of frequency of freely damped ν=f(T) oscillatory process excited in investigated samples of polyethylene with different degree of crystallinity in the temperature range from −150 ∘C to +150 ∘C. It is established that four local dissipative processes of different intensity shown in different temperature intervals are observed on the spectra λ=f(T). These are μ, β, α, βk processes. The theoretical analysis of the relationship between the anomalous changes of the vibrational process frequency ν=f(T) and the shift modulus defect ΔG=f(T) and the internal friction mechanisms for each of the dissipative loss processes detected on the spectrum λ=f(T) is carried out. The influence of supramolecular structures on local dissipative βk process in polyethylene is estimated.