Abstract
The fatigue mechanism of segmented poly(urethaneurea)s due to a sinusoidal strain was investigated from the structural point of view by means of small angle light scattering (SALS), small angle X-ray scattering (SAXS), and infrared dichroism (IRD) and was compared with the uniaxial deformation mechanism. The SALS patterns of the original sample films indicated the existence of a spherulite texture. There appeared a ring diffraction pattern in the SAXS photograph for the as-cast sample. The diffraction pattern came to have azimuthal angular dependence when stretched or fatigued, which was characterized by a defect in intensity in the stretching direction and a local concentration in intensity at the edge of the defect. Those indicated a selective destruction of the hard segment domain in the equatorial zone of the spherulite. The fatigued mechanism is proposed in order to account for the experimental results based on the spherulite deformation model. It was also found that samples having longer soft segments have higher degree of phase separation at the beginning and that these mechanical properties and orientational behavior are less sensitive to fatigue time.
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I. Kimura, H. Ishihara, H. Ono, N. Yoshihara, S. Nomura, and H. Kawai, Macromolecules, 7, 355 (1974).
H. Ono and I. Kimura, Kagakuzoukan, 50, 181 (1971).
C. S. P. Sung, T. W. Smith, and N. H. Sung, Macromolecules, 13, 117 (1980).
G. L. Wilkes and S. Abouzahr, Macromolecules, 14, 456 (1981).
C. B. Wang and S. L. Cooper, Macromolecules, 16, 775 (1983).
H. Ishihara, I. Kimura, and N. Yoshihara, J. Macromol. Sci. Phys., B22, 713 (1983–1984).
M. Shibayama, T. Kawauchi, T. Kotani, S. Nomura, and T. Matsuda, Polym. J., 18, 725 (1986).
J. A. Miller, S. L. Cooper, C. C. Han, and G. Pruckmayr, Macromolecules, 17, 1063 (1984).
R. Bonart, J. Macromol. Sci. Phys., 132, 115 (1968).
K. Hoffmann and R. Bonart, Makromol. Chem., 184, 1529 (1983).
C. R. Desper, N. S. Schneider, J. P. Jasinski, and J. S. Lin, Macromolecules, 18, 2755 (1985).
A. Takahara, J. Tashita, T. Kajiyama, and M. Takayanagi, Kobunshi Ronbunshu, 39, 203 (1982).
T. Hashimoto, S. Suehiro, M. Shibayama, K. Saijo, and H. Kawai, Polym. J., 13, 501 (1980).
M. Fujimura, T. Hashimoto, and H. Kawai, Mem. Fac. Eng., Kyoto Univ., 43(2), 224 (1981).
R. S. Stein and M. B. Rhode, J. Appl. Phys., 31, 1873 (1960).
M. Shibayama, T. Hashimoto, and H. Kawai, Macromolecules, 16, 1434 (1983).
C. S. Sung, D. B. Hu, and C. S. Wu, Macromolecules, 13, 111 (1980).
A. Takahara, J. Tashita, T. Kajiyama, and M. Takayanagi, Polym. Prepr. Jpn., 32, No. 8, 2007 (1983).
G. M. Estes, R. W. Seymour, and S. L. Cooper, Macromolecules, 4, 452 (1975).
J. T. Koberstein and R. S. Stein, J. Polym. Sci., Polym. Phys. Ed., 21, 1439 (1983).
T. Hashimoto, H. Kawasaki, and H. Kawai, J. Polym. Sci., Polym. Phys. Ed., 16, 271 (1978).
K. Sasaguri, R. Yamada, and R. S. Stein, J. Appl. Phys., 35, 3188 (1964).
T. Oda, S. Nomura, and H. Kawai, J. Polym. Sci., A, 3, 1993 (1965).
K. Fujita, S. Suehiro, S. Nomura, and H. Kawai, Polym. J., 14, 545 (1982).
See, for example, A. Peterlin and G. Meinel, Makromol. Chem., 142, 227 (1971).
T. Pakula, K. Saijo, H. Kawai, and T. Hashimoto, Macromolecules, 18, 1294 (1985).
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Shibayama, M., Ohki, Y., Kotani, T. et al. Structure and Properties of Fatigued Segmented Poly(urethaneurea)s II. Structural Analyses of Fatigue Mechanism. Polym J 19, 1067–1080 (1987). https://doi.org/10.1295/polymj.19.1067
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DOI: https://doi.org/10.1295/polymj.19.1067
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