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Polymer Science, Series D

Published in:

01-10-2019

The Gradient of Dynamic Mechanical Characteristics across the Thickness of Epoxy Polymers during Environmental Exposure

Authors: V. O. Startsev, M. P. Lebedev, M. V. Molokov, D. R. Nizin

Published in: Polymer Science, Series D | Issue 4/2019

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Abstract

Temperature dependences of dynamic modulus of elasticity and dynamic loss modulus of four compositions of epoxy polymers based on 2,2-di-(4-hydroxyphenyl) propane and a cycloaliphatic amine hardener in an initial state and after 3, 6, 9, and 12 months of exposure on an open bench under conditions of moderately warm climate of Gelendzhik. A glass transition temperature determined during a transition from a glassy state to a highly elastic one of epoxy polymers proved to be sensitive to the polymer composition, an amount of sorbed moisture and duration of exposure. Postcuring of polymers, masked by a plasticizing effect of moisture, is discovered. The glass transition temperature of exposed epoxy polymers changes unevenly across the thickness of specimens. Properties of a surface layer facing the sun (on the front side) change to the greatest extent. Methods of dynamic mechanical analysis have good sensitivity and informativeness for a study of non-uniformity of climatic aging across the thickness.

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Title: The Gradient of Dynamic Mechanical Characteristics across the Thickness of Epoxy Polymers during Environmental Exposure
Authors: V. O. Startsev
M. P. Lebedev
M. V. Molokov
D. R. Nizin
Publication date: 01-10-2019
Publisher: Pleiades Publishing
Published in: Polymer Science, Series D / Issue 4/2019
Print ISSN: 1995-4212
Electronic ISSN: 1995-4220
DOI: https://doi.org/10.1134/S1995421219040154

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