Effect of thermal treatment on structure and properties of polyester tire cords

Abstract

Polyester and nylon are the mostly used reinforcing textile fibers in many industrial rubber applications. Now-a-days body ply of a passenger car radial is mostly made up of polyester fiber. Because of its thermoplastic nature, it undergoes some kind of thermal shrinkage during processing and vulcanization, which lead to many problems related to shape, dimension, and dimensional stability. To avoid this, polyester is subjected to thermal treatment at higher temperature. Hence, thermomechanical properties of polyester tire cords become very important. During the thermal treatment, there is not only change in shrinkage, shrinkage force, and mechanical properties but also it affects structural and morphological properties. In this work, the changes in thermomechanical properties due to heat setting have been correlated to structural and morphological changes like crystallinity, crystal size, orientation, crystal perfection, etc. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 124: [266][267][268][269][270][271][272][273][274] 2012

Study of thermomechanical properties of hybrid tire cord

“…It should be noted that the trend of the modulus changes in the yarns is similar to the hybrid cord. In addition, at the load of 600 gf, by increasing temperature in all samples, the modulus decreases owing to the chain folding and entropy recovery 20 …”

“…It causes shrinkage of up to 3% in the hybrid cord. This means some shrinkage will remain in the samples under a load of 1800 gf 20,21 . But under 600 gf, the specimens have been allowed to shrink in the first heating step, and reheating causes little residual shrinkage.…”

“…If the applied force is less than the polymer shrinkage one, the chains can fold and shrink during heat treatment and move to a less entropic state. Therefore, there are fewer chains with a high tendency for contraction after the thermal process as a result, the shrinkage force will decrease 20 . The heat treatment temperature also has a similar effect on the samples so that the higher the process temperature, the more chains contracted, hence, the shrinkage force will decrease.…”

Influence of tire cord layers and arrangement direction on mechanical properties and vibration isolation of chloroprene rubber composite materials reinforced with polyester tire cord

“…This type of cord provides good strength, fatigue resistance, excellent toughness, dimensional stability, and low-heat generation [1,2] . Chloroprene rubber (CR) is well known for its high tensile strength [3] as well as resistance to solvents [4] , ozone [5] , weather [6,7] , oil [8] , and heat [9,10] .…”

Influence of tire-cord layers and arrangement direction on the physical properties of polyester tire cord reinforced with chloroprene rubber composite materials

“…This type of cord provides good strength, fatigue resistance, excellent toughness, dimensional stability, and low heat generation [1,2] . Chloroprene rubber (CR) is well known for its high tensile strength [3] and resistance to solvents [4] , ozone [5] , weather [6,7] , oil [8] , and heat [9,10] .…”