Study on the Interface Reaction and Properties of Carboxynitrile Rubber/Blended Polyurethane

Haodong Yu; Sen Liang

doi:10.63313/FE.2004

Authors

Haodong Yu School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China Author
Sen Liang School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China Author

DOI:

https://doi.org/10.63313/FE.2004

Keywords:

Carboxynitrile rubber, Blended polyurethane, Interface response, Mechanical performance testing

Abstract

Millable polyurethane (MPU) is widely used in the field of sealing and wear-resistant components due to its excellent solvent resistance and dimensional stability. However, its inherent drawbacks of high rigidity and low elasticity limit its application in complex working conditions. Carboxylated nitrile butadiene rubber (XNBR) contains reactive carboxyl groups (-COOH) in its molecular chain, which can chemically interact with the isocyanate groups (-NCO) of MPU, providing a new approach to improve the mechanical properties of MPU. At present, research on the blending of XNBR with thermoplastic polyurethane (TPU) has been reported, but studies on the interfacial reaction mechanism, process regulation, and mechanical property synergy rules of the XNBR/MPU system are rarely conducted. In this study, an integrated technical route of "molecular simulation - experimental verification - performance characterization" was adopted, focusing on the correlation between the interfacial reaction and mechanical properties of the XNBR/MPU system: 1) Molecular dynamics simulations were used to confirm that the amidation reaction between XNBR and MPU proceeds spontaneously at 80°C, and the interfacial cross-linking mechanism of amide bonds was revealed; 2) The optimal formula was determined through orthogonal experiments, and mechanical property tests were carried out. This study provides theoretical support for the development of high-performance XNBR/MPU blended materials and has application value in the fields of automotive sealing and shock absorption.

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