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Colorimetric method for measuring polyester degradation due to weathering
Author(s) -
Gray V. E.,
Wright J. R.
Publication year - 1963
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/app.1963.070070616
Subject(s) - polyester , thermosetting polymer , materials science , diamine , degradation (telecommunications) , polyester resin , methanol , glass fiber , composite material , colorimetry , chemistry , polymer chemistry , organic chemistry , chromatography , telecommunications , computer science
Chemical changes occurring in thermoset polyesters during exposure to solar and carbon‐arc radiant energy were determined quantitatively by a color reaction with a diamine, N , N ‐dimethyl‐ p ‐phenylenediamine, in a methanol–benzene solution. The amount of diamine reacting with a specimen and the color change of the treated specimen, as measured by differential reflectance, varied directly with exposure time. Three commercial polyesters (glass fiber‐reinforced) exposed under identical conditions showed widely different degradation rates as measured by the amount of N , N ‐dimethyl‐ p ‐phenylenediamine used per specimen. The relative stability of the three materials was independent of irradiation source. The color of the treated specimen was dependent on exposure time.