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Effect of matrix's type on the dynamic properties for short fiber‐elastomer composite
Author(s) -
Ashida Michio,
Noguchi Toru,
Mashimo Satoshi
Publication year - 1985
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.1985.070300311
Subject(s) - composite number , elastomer , fiber , dynamic mechanical analysis , composite material , matrix (chemical analysis) , isothermal process , materials science , moduli , dispersion (optics) , volume fraction , physics , polymer , thermodynamics , optics , quantum mechanics
Abstract The dynamic moduli, E ′ and E ″, and tan δ for PET–CR, PET–EPDM, and PET–UR composites with unidirectional short fibers were studied as a function of temperature by using a Rheovibron. The temperature dependence of tan δ showed three peaks for PET–elastomer composites. The peaks at the low temperature corresponded to the main dispersion of the respective matrixes and the peak at about 140°C to the α‐dispersion of PET fiber. A small and broad peak observed at a temperature between 60 and 120°C may be caused by the relaxation of the interface region between fibers and matrix. The longitudinal storage modulus for the composite E ∥ ′was given by the parallel model as \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm E'}_\parallel = V_f \cdot E'_f + V_m \cdot E'_m $\end{document} , where E f ′and E m ′are the storage moduli for fiber and matrix and V f and V m are the volume fraction of fiber and matrix, respectively. In the transverse direction of fibers, the composite modulus E ⊥ ′was expressed by the logarithmic law of mixing as follows: \documentclass{article}\pagestyle{empty}\begin{document}$ \log E'_ \bot = V_f \cdot \log E'_f + V_m \cdot \log E'_m $\end{document} . The peak values of tan δ from the main dispersion of the respective matrixes were given by the equation, (tan δ ⊥max ) c /(tan δ max ) m 1 − β · V f , where (tan δ ⊥max ) c and (tan δ max ) m are the maximum values of the loss tangent for the composite and matrix, respectively, and β is coefficient depending on matrix's type. The β value of PET–CR composite is the largest one among those of the composites.