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The effect of temperature and humidity on the long‐term performance of poly(butylene terephthalate) compounds
Author(s) -
Borman W. F. H.
Publication year - 1982
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760221406
Subject(s) - extrapolation , relative humidity , materials science , partial pressure , humidity , water vapor , vapor pressure , thermodynamics , term (time) , vapour pressure of water , composite material , mathematics , organic chemistry , chemistry , mathematical analysis , oxygen , physics , quantum mechanics
A model was developed that closely fits new and previously published test data for the aging of poly(1,4‐butylene terephthalate) (PBT) compounds under conditions of elevated temperature and high relative humidity. The model equation, stated in terms of absolute temperature and water vapor partial pressure, allows extrapolation of accelerated aging data to ambient conditions that prevail in realistic applications of the materials. For practical reasons, the water vapor partial pressure is preferred as a model variable over relative humidity, although it is shown that both variables are equivalent in a formal sense.