Acoustic spectra of some polypropylene glycols. Rotational-isomer relaxation

Autor:	L.N. Ganyuk, T.P. Tantsyura, A.L. Stribulevich, Ogenko Vladimir M, V.S. Sperkach, L. V. Dubrovina, A.A. Chuiko
Rok vydání:	1991
Předmět:	Polypropylene chemistry.chemical_compound Absorption (acoustics) Polypropylene glycol Chemistry Dispersion (optics) Polymer chemistry Relaxation (NMR) General Engineering Analytical chemistry Low frequency Kinetic energy Spectral line
Zdroj:	Polymer Science U.S.S.R.. 33:1061-1065
ISSN:	0032-3950
DOI:	10.1016/0032-3950(91)90207-7
Popis:	The acoustic spectra of a series of liquid polypropylene glycols with M = 250, 425 and 1025 have been studied. The speed of propagation and absorption of sound over the frequency range 1–2500 MHz and also the density and shear viscosity coefficient in the interval 283–343 K have been measured. The acoustic spectra of polypropylene glycols in the frequency and temperature ranges studied consist of two simple dispersion regions. The parameters characterizing these regions have been calculated. The low frequency region of dispersion is governed by the processes of conformational transitions in the polypropylene glycol molecules. The thermodynamic and kinetic parameters in the low frequency region of dispersion have been calculated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f6d270c3e7589d3c91ff2a0c7f2519f0 https://doi.org/10.1016/0032-3950(91)90207-7 Zobrazit plný text záznamu