Kinetics of hydrogenation of acrylonitrile butadiene rubber: a latex-based in situ and low-temperature approach
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Kinetics of hydrogenation of acrylonitrile butadiene rubber: a latex-based in situ and low-temperature approach Xiaolei Wang 1 & Jujie Sun 1 & Lin Xia 1 & Chunfu Wang 1 & Jin Kuk Kim 2 & Chengzhong Zong 1 Received: 30 March 2020 / Revised: 2 August 2020 / Accepted: 3 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The kinetics of hydrogenation of acrylonitrile butadiene rubber (NBR) latex by the action of diimide generated by hydrazine hydrate and hydrogen peroxide in the presence of copper sulfate at low temperature was studied by calculating the initial reaction rate constants. Altering reaction parameters of different reactant dosages such as carbon-carbon double bonds, hydrazine hydrate, hydrogen peroxide, and copper sulfate can be designed to calculate the initial reaction rate constant in a hydrazine hydrate/ hydrogen peroxide/copper sulfate reaction system. The method of initial reaction rate constants gives rate constant and reaction order in the hydrogenation reaction of NBR latex calculated from the hydrogenation kinetic data. Based on these kinetic values, the kinetic equation of hydrogenation of NBR latex in this catalytic system at the temperature ranged from 5 to 65 °C and the hydrogenated reaction activation energy were studied in this paper. Keywords Hydrogenated nitrile butadiene rubber . Latex . Diimide . Kinetics . Low temperature
Introduction Nitrile butadiene rubber (NBR) has poor aging resistance due to the presence of carbon-carbon double bonds, [1–3] degradation in the presence of oxygen and ozone, and poor stability under some extreme external conditions. Therefore, the application of NBR in the oil drilling and automotive industries is restricted in harsh environments, so the hydrogenation of NBR becomes an essential step. At present, the industrially produced HNBR is primarily produced by the solution hydrogenation of precious metal catalysts under high temperature and pressure. HNBR prepared by solution hydrogenation has the problems of a complicated process, high cost, high energy consumption, and environmental pollution. Therefore, in recent years, with the continuous increase of the demand of
* Jin Kuk Kim [email protected] * Chengzhong Zong [email protected] 1
School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
2
Elastomer Lab, Department of Materials Engineering and Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju 52828, South Korea
HNBR, the application field has continued to expand, and the method of hydrogenation of NBR at the latex stage has been granted special attention [4–6]. HNBR was carried out by in situ hydrogenation of NBR latex with diimide. The latex was served as the reaction medium and hydrazine hydrate was used as a catalyst to produce a diimide to participate in the hydrogenation reaction. It effectively avoids the use of highly toxic organic solvents, high-cost precious metal catalysts, and tedious problems of solutio
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