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Variation of dynamic mechanical properties of polycarbonate as a result of deformation
Author(s) -
Kolman H. J.,
Ard K.,
Beatty C. L.
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.760221508
Subject(s) - polycarbonate , materials science , creep , composite material , stress relaxation , deformation (meteorology) , relaxation (psychology) , dynamic mechanical analysis , stress (linguistics) , polymer , psychology , social psychology , linguistics , philosophy
A combination of different experimental apprati has allowed dynamic mechanical spectroscopic measurements to be made as function of variable, constant offset stress, as well as during creep of bisphenol‐A‐polycarbonate. The deformation system was calibrated with aluminum and by comparison of low‐stress dynamic mechanical spectra with literature data of polycarbonate. Dynamic mechanical spectra acquired at high offset stress result in an apparent shift in sub‐ T g relaxation processes to higher temperatures at differing rates, resulting in separation of the various relaxation processes. This observed phenomenon is analogous to similar effects that are observed via the application of pressure. The creep process can be clearly monitored by changes in dynamic mechanical properties, with these changes being dependent upon the stress and temperature utilized.