The effects of physical aging on the quasi-static and dynamic viscoelastic properties of Nitrile Butadiene Rubber

Ammineni, Syam Prasad; Dumpala, Lingaraju; Nagaraju, C.

doi:10.1007/s11043-023-09591-2

Cited by 2 publications

(2 citation statements)

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“…2 The shelf life of NBR can be affected by factors such as aging and temperature, which can lead to material degradation and a decline in damping effectiveness. 3 It is therefore essential to investigate the effects of these factors on the persistent performance of NBR viscoelastic dampers. By accurately estimating the shelf life, engineers can make informed decisions regarding the replacement or maintenance of NBR dampers in various applications.…”

Section: Introductionmentioning

confidence: 99%

“…Plota and Masek 4 provides an overview of the impact of environmental factors on degradation processes and discusses methods for predicting lifetime. Ammineni et al 3 analyze the effect of physical aging on viscoelastic properties and determine the shelf life of NBR. Hill et al 5 study the sorption kinetics of water vapor and determine activation energies.…”

Section: Introductionmentioning

confidence: 99%

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Estimating shelf life and degradation mechanisms of nitrile butadiene rubber for viscoelastic dampers

Ammineni,

Lingaraju,

Nagaraju

2024

Journal of Elastomers & Plastics

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This study investigates the shelf life of nitrile butadiene rubber (NBR) based on age and temperature factors. Natural aging of nitrile butadiene rubber samples is performed under laboratory conditions for 2 years, followed by thermogravimetric analysis to evaluate Arrhenius parameters. Toop’s equation is used to predict shelf life at 5% conversion rate. Model-free kinetic methods, including Ozawa-Flynn-Wall (OFW), Kissinger-Akahira-Sunose (KAS), and Kissinger, estimate shelf life at different temperatures for both virgin and naturally aged nitrile butadiene rubber. Results show close correlation between KAS and Kissinger methods, with slight variations in activation energy impacting shelf life. Fourier-transform infrared spectroscopy (FTIR) tests assess functional group changes with age. Virgin nitrile butadiene rubber activation energy: OFW-73.33 kJ/mol, KAS-68.43 kJ/mol. Aged nitrile butadiene rubber activation energy: OFW-72.57 kJ/mol, KAS-67.88 kJ/mol. Shelf life at 40°C: Virgin nitrile butadiene rubber - OFW-111.29 years, KAS-26.31 years. Aged nitrile butadiene rubber - OFW-89.01 years, KAS-22.37 years. These findings provide valuable insights for predicting and assessing nitrile butadiene rubber viscoelastic damper performance in engineering applications.

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Section: Introductionmentioning

confidence: 99%