Change in fiber properties due to the heat treatment of nylon 6 tire cords

Rath, Johannes; Chaki, T. K.; Khastgir, Dipak

doi:10.1002/app.27941

Cited by 15 publications

(11 citation statements)

References 30 publications

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“…The variation of shrinkage force against exposure time in isothermal condition at different temperatures of heat treatment is presented in Figure 1. It was also observed from this figure that at all temperatures of thermal treatment initially the shrinkage force increases with exposure time almost linearly and then attains a plateau value within 30–50 s similar to nylon 6, as observed in our earlier studies 26. However at very high temperature (≥170°C) of exposure, small drop in shrinkage force beyond 30–50 s is not observed in case of polyester as that of nylon 6.…”

Section: Resultssupporting

confidence: 86%

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

Rath

Chaki

Khastgir

2011

J of Applied Polymer Sci

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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

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Section: Resultssupporting

confidence: 86%

“…The drop in tenacity over the whole temperature range (150–210°C) of heat treatment is gradual. However, in our earlier work, we observed that there was a drastic drop in tenacity as well as elongation at break for nylon 6 tire cord at 210°C 26. This may be due to the difference in the melting point of both the fibers.…”

Section: Resultsmentioning

confidence: 66%

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

Rath

Chaki

Khastgir

2011

J of Applied Polymer Sci

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“…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.…”

Section: Resultsmentioning

confidence: 99%

Study of thermomechanical properties of hybrid tire cord

Mahdavipour

Karimi

Hoseini³

2020

Polymers for Advanced Techs

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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.

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“…The degree of DSC-crystallinity is calculated from the melting enthalpy values employing equation (1) where χ c is the degree of DSC-crystallinity, ΔH m is the melting enthalpy of the sample under consideration and ΔHm o is the melting enthalpy of the 100% crystalline sample. A typical value of 191 J/g was taken for the 100% crystalline PA6 [38].…”

Section: Methodsmentioning

confidence: 99%

Characterization of amorphous carbon fibers produced from thermally stabilized polyamide 6 fibers

Karacan

Meşeli

2016

Journal of Industrial Textiles

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Amorphous carbon fiber from polyamide 6 (PA6) precursor was produced using a multi-step procedure consisting of oxidative stabilization in air at 180℃ in the presence of cupric chloride impregnation, pre-carbonization at 250℃ and carbonization at temperatures ranging from 500℃ to 1000℃ in nitrogen. The results obtained from thermal analysis data suggested that cupric chloride impregnation enhanced thermal stability. During the oxidative stabilization process, a polymorphic structure consisting of α- and γ-phases was eliminated due to the decrystallization process. The pre-carbonization step was found to be necessary to enhance the thermal stability of oxidatively stabilized PA6 fiber prior to carbonization. The results suggested that the pre-carbonization step improved the aromatization and crosslinking reactions. The results obtained from the experimental data suggested that the carbonization temperature had an effective role on the molecular structure and properties of the resulting carbon fibers. The carbon fibers obtained from stabilized and pre-carbonized PA6 fibers showed physical and structural changes with rising temperature. They were characterized by a reduction in fiber diameter, linear density, carbon fiber yield, hydrogen and nitrogen content values due to the removal of non-carbon elements together with increases in the values of density, crystallite thickness, carbon content, C/H ratio and electrical conductivity values. The results obtained from X-ray diffraction, IR spectroscopy and elemental analysis suggested that the crystalline structure was totally lost and converted to a carbonized structure at 500℃ and above due to the formation of an amorphous carbon structure during carbonization reactions.

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Change in fiber properties due to the heat treatment of nylon 6 tire cords

Cited by 15 publications

References 30 publications

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

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

Study of thermomechanical properties of hybrid tire cord

Characterization of amorphous carbon fibers produced from thermally stabilized polyamide 6 fibers

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