Relaxation transitions in polybutadiene methylstyrene according to the data for mechanical and structural relaxation

Бартенев, Г. М.; Lazorenko, M.V.; Shut, N. I.

doi:10.1016/0032-3950(85)90225-4

Cited by 5 publications

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“…Two temperature regions of the most intense local dissipative processes (β and β k ) are observed on the spectra λ = f (T) in the temperature range from −150 • C to +150 • C for PE. The temperature regions of these processes partially coincide with the data published earlier [39][40][41][42][43][44][45][46]. In addition, two temperature regions with very weak intensity of local dissipative processes are identified on the spectra λ = f (T) and temperature dependencies of the frequency ν = f (T) of freely damped oscillatory process.…”

Section: Resultssupporting

confidence: 85%

Spectra of Internal Friction in Polyethylene

2022

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The study of spectra of internal friction λ=fT and temperature dependencies of frequency of freely damped ν=fT 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=fT. These are μ, β, α, βk processes. The theoretical analysis of the relationship between the anomalous changes of the vibrational process frequency ν=fT and the shift modulus defect ΔG=fT and the internal friction mechanisms for each of the dissipative loss processes detected on the spectrum λ=fT is carried out. The influence of supramolecular structures on local dissipative βk process in polyethylene is estimated.

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