The Influence of the Type of Dipping Composition on the Structure of Aramid Cord Threads

Abstract

Publications concerned with the influence of the type of dipping composition on the adhesion, physicomechanical, and service properties of aramid cord threads of grades Arom-75 (Rusar-75), Arom-175 (Rusar-175), and Rusar-200 are analysed. According to current ideas, the type of dipping composition affects not only the adhesion and physicomechanical properties of aramid cord but also its structure. Using electron spin resonance spectroscopy, we studied specimens of dipped Arom-75 cord threads and undipped threads (for comparison). The parameters characterising the structural state of the investigated polymer specimens were determined: the correlation time, the radical concentration in the investigated specimen, and the ratio of the proportion of dense amorphous regions to the proportion of loose amorphous regions. Data for cord based on Ruslan^® threads dipped in two different compositions and data for undipped cord were compared. The possibility of changing the structure of cord and the service properties of mechanical rubber goods with an aramid skeleton by using different types of dipping composition was shown.