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Predicting the service life of polysulfone in steam or hot water
Author(s) -
Dearing Rogers K.
Publication year - 1977
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.760171204
Subject(s) - creep , materials science , polysulfone , service life , deflection (physics) , stress (linguistics) , composite material , diaphragm (acoustics) , structural engineering , forensic engineering , polymer , engineering , linguistics , philosophy , physics , electrical engineering , loudspeaker , optics
A quantitative definition of stress‐environmental, interactions on polymers must be made in order to designstructural parts. This definition for design urposes is best obtained by measuring creep of the plastic under constant stress and in the environment in which it is to perform. In order to measure creep in steam or hot water, a relatively simple test apparatus was devised so that clamped circular test specimens acting as a diaphragm were stressed by controlled steam pressure. Creep was measured by deflection of the diaphragm. A case history was developed with polysulfone: the allowable stress limits at various temperatures were determined; and a method developed for predicting the long time service life of the material from short time data using the Goldfein equation of state. Creep measurements over a year in steam were in excellent agreement with predicted values.