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Thermal behavior of blends based on high‐molecular polyoxyethylene and salts from seawater and sea lye
Author(s) -
Bogdanov B.,
Zagortcheva M.,
Gjurova K.,
Popov A.
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19981031)70:5<995::aid-app20>3.0.co;2-r
Subject(s) - seawater , thermal , materials science , polymer chemistry , chemical engineering , chemistry , polymer science , oceanography , geology , thermodynamics , physics , engineering
The purpose of this study was to increase the thermooxidative stability and flow of high‐molecular polyoxyethylene (HMPOE) by introducing readily available, technologically convenient, and economical additives. Binary systems consisting of HMPOE with mean viscosity molar mass M v = 3,2.10 6 g.mol −1 and inorganic salts from both the seawater and sea lye and, also, MgCl 2 of concentration from 1 to 10 mass % with respect to HMPOE, were prepared. The thermal behavior of these systems was studied by using dynamic thermal analysis, dynamic viscometry, and melt index determination. The presence of salts of concentrations from 3 up to 10 mass % in HMPOE was found to increase the temperatures of initial thermooxidative decomposition of the polymer. At the same time, the degree of viscosity reduction (−Δη, %) corresponding to lowering the average molar mass after the heat treatment for 20 h at 150°C decreased. Another effect of the salts was found to be the increased melt flow of HMPOE above 250°C. The best stabilizing effect was obtained in the presence of salts in sea lye and, also, MgCl 2 . © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 995–999, 1998