Reinforcement of EPDM matrices with carbon and polyester fibers—mechanical and dynamic properties

Abstract

SynopsisThis paper reports on the study of the mechanical and dynamic properties of composites with an EPDM matrix and short fiber, either polyester or carbon, at three different fiber concentrations. In general, the properties prove to be dependent on fiber concentrations and type, in particular on the final ratio fiber length/diameter. This ratio ranges for carbon fiber over 35-45 and for polyester over 135-175, thus placing the former near the lower limit of acceptability. Evidence is supplied of the existence of adhesion between the matrix and the fiber, in the form of measurements of the swelling and dynamic properties, especially through variation of relative damping and the displacement of the dynamic glass transition temperature towards higher ranges. Composites present a marked property anisotropy.

Ambient Fixation of Carbon Dioxide using a ZnIIsalphen Catalyst

“…The decrease in tan δ max is most significant in the case of the EPDM/LEP‐C18‐MMT hybrid and, moreover, there is a shift of T g toward a higher temperature in the hybrid. These observations are ascribed to strong interfacial action between the matrix rubber and the filler, which is normally observable in other rubber composites 16–20. It is also evident from Figure 3(b) that the storage modulus of EPDM/LEP‐C18‐MMT is larger than that of EPDM/C18‐MMT, due to the greater reinforcing effect of the LEP‐C18‐MMT.…”

Application of dynamic mechanical analysis for the study of the interfacial region in carbon fiber/epoxy composite materials

“…The damping peaks are superposed in Rg. 9. As one can see, for all fiber volume fractions, there is only a single symmetric damping peak, which excludes the presence of the soft interphase.…”

Influence of the nature and the content of carbon fiber on properties of thermoplastic polyurethane‐carbon fiber composites

“…In addition, they present a benefit in contrast to the composite prepared with continuous fibers: instead of using slow processes for incorporating continuous fibers, short fibers are incorporated as one of the recipe ingredients, with the stipulation that, during the mixing process, the direction of the cylinder rotation is constant (to get maximum uniformity in the orientation of the fiber in the matrix 1,2 ). Several factors should be considered to achieve an adequate reinforcement with short fibers, although the levels reached with continuous fibers can never be attained, [3][4][5] including preservation of highly uniform fiber orientation in the matrix, preservation of an appropriate length/diameter ratio (aspect ratio) in the fiber, and establishment of the strongest possible fiber-matrix bond.…”

“…The reinforcement of elastomers with short or discontinuous fibers gives composites that, combining the rigidity of the fiber with the elasticity of the elastomer, have a series of properties that make them suitable for many specific applications. In addition, they present a benefit in contrast to the composite prepared with continuous fibers: instead of using slow processes for incorporating continuous fibers, short fibers are incorporated as one of the recipe ingredients, with the stipulation that, during the mixing process, the direction of the cylinder rotation is constant (to get maximum uniformity in the orientation of the fiber in the matrix 1,2 ).…”