Aramid‐short‐fiber reinforced rubber as a tire tread composite

Abstract

in Wiley InterScience (www.interscience.wiley.com).ABSTRACT: Mechanical and dynamic-mechanical properties of a typical tire tread compound reinforced with one part aramid short fibers were investigated in order to predict the effects of fibers on tire tread performances such as rolling resistance and traction. Rubber processing, including mixing and extrusion, was performed in an industrial scale. Fiber orientation as a result of extrusion was evaluated quantitatively and qualitatively using mechanical anisotropy in swelling and scanning electron microscopy, respectively. Unidirectional tensile tests revealed higher modulus, but slightly lower strength and elongation at break for the composites stretched in the longitudinal (orientation) and transverse directions than those for the isotropic reference compound with no fiber. Dynamic mechanical thermal analysis showed that relative values of loss factor for the longitudinal and transverse composites and the reference compound depended on the state of polymer as glassy or rubbery. Therefore, a high loss factor at lower temperatures and a low loss factor at higher temperatures predicted a balanced improvement of tire traction and rolling resistance as a result of fiber addition. Heat build-up and abrasion experiments showed that addition of fiber did not deteriorate other performances of tire tread. Also, the fibers had negligible effects on processing and vulcanization characteristics of the composite.

Aramid pulp with physisorbed imidazolium ionic liquids for solvent‐casted enhanced styrene‐butadiene rubber composites

“…A variety of fibers has been used for that, including PPTA, carbon, glass and ultrahigh‐molecular‐weight polyethylene . Improvements in wet traction and rolling resistance were observed by adding a small amount of short fiber surface‐treated PPTA pulp in CB‐filled tire tread compounds – . For instance, a two‐step dipping process with (1) epoxy resin (in some cases, replaced by isocyanate) and (2) resorcinol formaldehyde latex (RFL) may be used to increase reactivity of the fiber surface and, consequently, the rubber–fiber interaction.…”

Cotton fibers reinforcement of HNBR: Control of fiber alignment and its influence on properties of HNBR vulcanizates

“…One possible solution is the replacement of aggregate fillers with fibrillar fillers having high aspect ratio. Such fillers include aramid fiber, fibrillar silicate, silk, and cellulose fibers …”

“…Short fiber reinforced rubber composites (SFRCs) are mostly known nowadays because they possess good mechanical properties such as modulus and strength even at low fiber loading. Generally, there are many factors controlling reinforcing efficiency of short‐fiber, that is, fiber aspect ratio, orientation, dispersion degree and rubber–fiber adhesion . It has been reported that fiber alignment plays substantial role in anisotropy of reinforcement efficiency in SFRCs .…”

“…Such fillers include aramid fiber, fibrillar silicate, silk, and cellulose fibers. [1][2][3][4][5] Short fiber reinforced rubber composites (SFRCs) are mostly known nowadays because they possess good mechanical properties such as modulus and strength even at low fiber loading. Generally, there are many factors controlling reinforcing efficiency of short-fiber, that is, fiber aspect ratio, orientation, dispersion degree and rubber-fiber adhesion.…”

Effect of short polyethylene terephthalate fibers on properties of ethylene-propylene diene rubber composites

“…The properties and performance of short fiber reinforced rubber composites depend on several factors such as the nature, aspect ratio (L/D), orientation and concentration of fibers as well as the adhesion strength of the fiber/matrix [4]. Chemical nature of the fibers, the matrix and the presence of a bonding system determine the extent of interfacial adhesion and thus the strength of the composites [7][8][9][10][11].…”