Effect of matrix's type on the dynamic properties for short fiber-elastomer composite

Abstract

SynopsisThe dynamic moduli, E' and Err, and tan S 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 6 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 adispersion 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 = V,. Ei + V, E A where E; and EL are the storage moduli for fiber and matrix and V, and V, 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: log E; = V,. log E i + V, . log EL. The peak values of tan 6 from the main dispersion of the respective matrixes were given by the equation, (tan G,,,),/(tan 6,,), = 1 -fi . V , where (tan S,max)c and (tan 6, J, are the maximum values of the loss tangent for the composite and matrix, respectively, and /3 is coefficient depending on matrix's type. The fi value of PET-CR composite is the largest one among those of the composites.was given by the parallel model as

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