Viscoelastic properties of short aramid fibers‐reinforced rubbers

Abstract

Among short fiber‐reinforced composites, those with rubber matrices have gained great importance due to the advantages they have in processing and low cost, coupled with high strength. These composites combine the elastic behavior of rubbers with strength and stiffness of fibers. Reinforcement with short fibers offers attractive features such as design flexibility, high modulus, tear strength, etc. The degree of reinforcement depends upon many factors such as: the nature of the rubber matrix, the type of fiber, the concentration and orientation of the fibers, the fiber to rubber adhesion and fiber length. One of the main features related to this class of composites is their hysteretic properties which are of great importance especially in dynamic applications such as tire treads. In this research, short aramid fibers with different kinds of surface treatments: Standard finish and resorcinol formaldehyde latex (RFL)‐coating, have been applied in two different carbon black filled rubber compounds based on natural rubber (NR) and ethylene propylene diene rubber (EPDM). The dynamic properties of the compounds have been measured as influenced by the different kinds of fiber treatments on rubber‐fiber interaction. Finally, the contribution of the interfaces and/or interphase layers to the loss properties is characterized. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2013

Loading rate sensitivity of liquid nitrogen conditioned glass fiber reinforced polymeric composites: An emphasis on tensile and thermal responses

“…DMTA is an instrument that helps to evaluate the viscoelastic response of the material for a wide range of temperature . The DMTA of the unconditioned and conditioned specimens were carried out in the temperature range of 40 to 200 °C.…”

“…DMTA is an instrument that helps to evaluate the viscoelastic response of the material for a wide range of temperature. [31][32][33] The DMTA of the unconditioned and conditioned specimens were carried out in the temperature range of 40 to 200 8C. The viscoelastic behaviors of the GFRP composite specimens, conditioned to LN 2 temperature are presented in the Figure 8(a-d).…”

Effects of the short‐fiber tip geometry and interphase properties on the interfacial debonding behavior of rubber matrix composites

“…The reason was that the surface of the aramid fiber was smooth, there was a lack of polar groups and chemical activity. In generally, epoxy resin coating was used as the surface treatment method of the aramid fiber . Thus, the elastic modulus of the interphase varied between E e = 3 GPa (fiber coated with the epoxy resin) and E m = 2 MPa (rubber matrix).…”

“…In generally, epoxy resin coating was used as the surface treatment method of the aramid fiber. [29][30][31][32][33] Thus, the elastic modulus of the interphase varied between E e 5 3 GPa (fiber coated with the epoxy resin) and E m 5 2 MPa (rubber matrix). The modulus distribution(E(r)) along the direction of the fiber radius (r) are shown in Figure 7(a,b), respectively.…”

Enhancing the dispersion and adhesion of short aramid fibers in bromo‐isobutylene‐isoprene rubber using maleated polybutadiene resin via co‐vulcanization with 4, 4’ bis(maleimido)diphenylmethane

“…Nowadays, both these aramid fibers are commercially available in the market under different trade names like Kevlar, Twaron, Conex, Nomex and Technora . For many years different types and forms of aramid fibers have been used to reinforce different elastomers and thermoplastic elastomers (TPEs) to improve various properties .…”