Study of thermomechanical properties of hybrid tire cord

Abstract

Thermomechanical properties of tire cords, which have a considerable influence on tire functions, were investigated in the current research. The nylon and polyester cords are the most commonly used polymers in the tire. Many efforts have been made to produce a new tire cord having the capability of integrating the desired properties of these two polymers into one cord. In this study, a new cord structure was developed using nylon 6,6 and polyester tire yarns. The effect of thermal treatment was studied at the temperatures of 180°C, 200°C, and 220°C under two different loads of 600 and 1800gf on thermomechanical properties of the nylon 6,6/polyester hybrid tire cord. Shrinkage and shrinkage force as thermal properties, as well as static and dynamic mechanical properties, were investigated. The relationship between the aforementioned properties and variation in the crystal structure and fiber orientation obtained from Differential scanning calorimetry (DSC) and Wide‐Angle X‐Ray Scattering (WAXS) analysis were examined too. The results showed that the higher tension leads to the higher initial modulus and storage modulus due to the crystallization of polymers during heat treatment. The shrinkage and shrinkage force also increased, as the tension increased. In addition, a decrease in residual shrinkage and shrinkage force were acquired because of an enhancement in the temperature.

Research progress on sustainability of key tire materials

“…110 The renewable lyocell fibers partially replace the aromatic polyamide fibers, thus reducing the dependence of the curtain fabric on the use of petrochemical resources. Mahdavipou and others studied the thermodynamic properties of PA66/PET hybrid curtain fabrics, 111 and their experimental results showed that the residual shrinkage rate and shrinkage force will increase with increasing load at any heat treatment temperature. To date, PET/nylon hybrid curtain fabrics, aromatic polyamide/nylon or polyester hybrid curtain fabrics, and other fabrics have been studied and applied as skeleton materials for the crown belts of radial tires.…”