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Microstructural diagnosis of block copolymer nonlinear mechanical properties. III: Cycling tensile tests
Author(s) -
Diamant Joram,
Williams Michael C.
Publication year - 1989
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.760290405
Subject(s) - materials science , copolymer , composite material , ultimate tensile strength , modulus , tension (geology) , stress (linguistics) , stress–strain curve , strain (injury) , polymer , deformation (meteorology) , medicine , linguistics , philosophy
The same three styrene‐butadiene‐styrene copolymers discussed in the companion paper (this issue) were tested by cycling in uniaxial tension/retraction, with large magnitude (to 600% in some cases) and different sequences and rates. The behavior of “set”, at the end of each retraction, is examined in detail and invoked to explain several other features of the stress‐strain curves. Time scales for structural recovery determined in the companion paper are found to assist this interpretation. Quantitative modeling of the isostructure retraction curves is accomplished in terms of the Mooney‐Rivlin strain function, modified to employ a strain variable amplified by the volume of broken glassy “filler”. Values of the two Mooney moduli G 1 and G 2 are used to infer various features of the microstructure.