Structure and adhesive properties of the RFL‐coated continuous basalt fiber cord/rubber interface

Abstract

The relationships between the structure of the resorcinol-formaldehyde-latex (RFL) layer, static adhesion, and interfacial fatigue properties between the RFL-coated continuous basalt fiber (CBF) cord and a rubber matrix were studied using films prepared from RFL systems with various formulas and H samples prepared with RFL-coated CBF cord and NR/SBR matrix. Thermomechanical analysis and tensile testing of the RFL films were carried out using a dynamic mechanical analyzer (DMA). The H pull-out force and fatigue properties were tested using a universal testing machine and an MTS, respectively. The interfacial fatigue life of the RFL-coated CBF cord/rubber samples exhibited different variation regularity from the variation of the H pull-out force as F/R and L/RF changed. The static adhesion reflected the connection strength between the cord and the rubber matrix, whereas the characteristics and the properties of the RFL layer played a decisive role in determining the damage rate of the adhesion. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44353.

Factors influencing resorcinol–formaldehyde–latex‐coated continuous basalt fiber cord/rubber interfacial fatigue behavior: Loading direction and RFL formula

“…Results obtained in our previous study and the test conditions of displacement of 5 mm and frequency 5 Hz.…”

“…To study the effects of the loading direction on the interfacial fatigue behavior, the fatigue properties obtained from the axial loading fatigue test by an MTS system (Eden Prairie, MN, as shown in Figure ), which were reported in our previous work, are also listed in this article, and the corresponding specimens were named according to the formula of the RFL layer, that is, using the Ax+RFL formula, for example, Ax1/6.…”

“…This result occurs because for the radial loading fatigue test, the effects on the cord/rubber interface were relatively small, and the residual H pull‐out force remained above 80% even after fatigue failure, implying that the morphologies of the pull‐out cords mainly reflected the fracture caused by the static H pull‐out force. By contrast, when the external force was loaded in the axial direction during the fatigue process, the large shear force directly applied at the interface and the slip and fracture of the rubber molecular chains were the cause of the interfacial fatigue failure, as discussed in a previous study …”

“…However, compared to adhesion evaluated in a static mode (H or T pull‐out test, peeling test, and so on), the interfacial fatigue properties are affected by more factors. In our previous work, in addition to the initial adhesive strength, the damage rate, which was influenced by both the interfacial structure and the modulus difference between the cord and the matrix, was also considered as a key factor for the control of the fatigue performance.…”

“…Continuous basalt fiber (CBF) is a type of natural mineral fiber and consists of SiO 2 and a series of metallic oxides . In our previous work, CBF was introduced into the field of rubber products as a novel skeleton material thanks to its environmental friendliness, excellent comprehensive properties, and relatively low cost. Furthermore, CBF cord is expected to replace steel cord due to its high strength and modulus.…”