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A modification of the method of intermittent stress relaxation measurements on rubber vulcanizates
Author(s) -
Ore Svein
Publication year - 1959
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.1959.070020610
Subject(s) - natural rubber , stress relaxation , modulus , relaxation (psychology) , materials science , tangent modulus , composite material , stress (linguistics) , tangent , young's modulus , dynamic modulus , thermodynamics , polymer chemistry , mathematics , dynamic mechanical analysis , physics , polymer , creep , geometry , philosophy , psychology , social psychology , linguistics
The method of continuous and intermittent stress relaxation measurements on rubber vulcanizates developed by Tobolsky and co‐workers has been modified by the introduction of intermittent tangent modulus measurements during the continuous relaxation experiments. This allows rate of scission and crosslinking to be determined simultaneously and on the same specimen. The method is based on the use of small or moderate extension ratios α and on the fact that in this case the stress f in actual rubbers is represented more closely by the empirical relationship f = 3 G (1−1/α) than by the theoretical f = G [α−(1/α 2 )], where 3 G denotes Young's modulus at infinitesimally small strains.