IMPROVEMENT OF LONG-TERM LIVES OF RUBBER GASKETS OF POLYACRYLATE (ACM) BY EMPLOYING CARBOXYL CURE SITES

다국어 초록 (Multilingual Abstract)

Rubber gaskets are used widely in many industries. An evaluation of the material properties and an accuratelifetime prediction of rubber are very important in the design process to ensure the durability and reliability of rubbercomponents. The properties of rubber-like materials are sensitive to ambient conditions, such as temperature, environment andmechanical load. Moreover, the initial properties of rubber gaskets must be sustained under working conditions to maintainits sealing function. To perform tests within a reasonable time, the highly accelerated life test (HALT) is generally used topredict the long-term lifetime of rubber materials. Polyacrylate (ACM) with chlorine cure sites is generally used for enginehead gaskets. An ACM with carboxyl cure sites was developed to improve the lifetime of the gaskets. A four-parametermethod representing the recovery behavior of the gaskets was published recently, and two revised methods for obtaining therecovery were proposed. The mean squared errors (MSEs) of the regression methods and experimental data were compared.
The life of a gasket for the target recovery (60%) of a compressed gasket was calculated somewhat differently depending onthe selected regression model to predict a considerably different long-term life. The parameters in the regression models wereobtained using the successive zooming genetic algorithm (SZGA), and the lives of ACM with a carboxyl cure site and ACMwith a chlorine cure site were compared.

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