Aramid fiber reinforcedEPDMmicrocellular foams: Influence of the aramid fiber content on rheological behavior, mechanical properties, thermal properties, and cellular structure

Abstract

In this paper, aramid fiber (AF)/ethylene‐propylene‐diene monomer (EPDM) microcellular foams added with different content of AF are prepared by the supercritical foaming method. The effect of the AF content on the rheological behavior, mechanical properties, thermal properties and cellular structure of the AF/EPDM microcellular foams has been systematically studied. The research illustrates that compared with pure EPDM, the AF/EPDM matrix has greater viscosity and modulus, which is conducive to reduce the cell size and increase its density. And the thermal stability of EPDM foams is improved with the addition of aramid fiber. Meanwhile, when the content of AF is added to 1 wt%, the AF/EPDM microcellular foam exhibits a relatively low thermal diffusion coefficient and apparent density with the thermal conductivity to 0.06 W/mK. When the AF is added to 5 wt%, the tensile strength of the AF/EPDM microcellular foam increases to 1.95 MPa, which is improved by 47% compared with that of the pure EPDM foam. Furthermore, when the compressive strain reaches to 50%, the compressive strength of the AF/EPDM microcellular foam is 0.48 MPa, improved by 296% compared with that of the pure EPDM foam.

Fabrication and evaluation of aramid fiber/polytetrafluoroethylene emulsion/tourmaline particle composite filter media: Filtration performance, thermal behavior, and mechanical property

“…The second decomposition step (490–650°C) generally was due to some homolytic cleavages of amide bonds and the breakings of linking bonds between the amide group and the benzene rings at meta-positions. 37 Moreover, small units of aryl nitriles were also mainly yielded during the second thermal disruption step, as well as for some other volatile matters. Simultaneously, some cross-linking reactions also proceeded among the generated intermediates to produce various condensed aromatic compounds, as described in the literature.…”

“…In general, the first decomposition step for the aramid fiber samples was usually ascribed to the disruption of the backbone of the fiber macro-chains via some heterolytic breakings of the amide bonds, accompanied by the releases of some low molecular weight matters, such as carboxylic acids, primary amines, and so on. 25,37 Particularly, some volatile fragments were produced during the first decomposition step and resulted in the mass loss of fiber substrate. Furthermore, various cross-linking reactions among the pyrolyzed intermediates usually also occurred to form some new compounds during the first decomposition step.…”

Lightweight and Mechanically Robust EPDM Foams for High Thermal Insulation and Moderate Ablative Resistance Via Constructing Cellular Char Layer

“…The cellular distribution of the fractured face was analyzed using Nano Measurer software. The cell density (N f ) was calculated according to the following equation: [35]…”

Influence of aviation hydraulic oil swelling on the mechanical properties of HNBR/EPDM vulcanizates reinforced by carbon black

“…Moreover, peroxide curing system has been proven to be useful for the co-vulcanization of HNBR and EPDM. [11][12][13][14][15] According to M.S.Loo, the fatigue properties of natural rubber were influenced strongly by the biodiesel environment, and the service life of expanded rubber was shorter than that of unexpanded rubber. 16 The research of Balasooriya studied the effect of swelling on the tribological properties of HNBR in different liquid environments, 17 which found that mechanical properties deteriorated in the swelling state and recovered after de-swelling.…”