Dynamic mechanical properties of crosslinked polyisoprene under deformation |
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Authors: | Naoki Sasaki Toyohiro Uchiumi Yoshihisa Sugo Noboru Nishida Shigeatsu Yamaguchi |
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Affiliation: | (1) Department of Applied Material Science, Muroran Institute of Technology, 050 Muroran, Japan;(2) School of Radiological Technicians, School of Medicine, Hokkaido University, 060 Sapporo, Japan |
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Abstract: | Summary Molecular motions of elastomers under deformations were observed through dynamic mechanical measurements. Composite master curves of dynamic moduli E and E and loss tangent tan over a wide range of frequency and in a state of elongation were obtained by the time-temperature superposition procedure. It is found that both moduli increase with strain, . The slope of the dispersion curve of E become more gradual with the increase in , while that of E is almost unchanged. The increment of E is generally larger than that of E, which does not agree with the N. W. Tschoegl prediction, E*()=f() Eo*(), where E*() and Eo*() are complex moduli at the strain of and O, respectively, and f() is the function of only . The difference in the strain dependence of E from E was found to correspond to the strain dependence of the equilibrium modulus. |
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