Effect of thermal aging on the defectiveness of ultrastrong para-aromatic armos and SVM fibres

Thermal characteristics of high-strength and thermostable aromatic fibres

“…However, such data are only reported in the literature for the strength indexes, estimated at 20 and 250 or 300°C [1][2][3][4][5][6][7]. In some studies, both the strength and the change in the strength in thermal aging and the thermal characteristics of the individual types of aromatic fibres have been compared [8][9][10][11][12][13][14]. The attempts to compare the few data from different researchers were very approximate due to the methodological differences and indeterminacy in selection of the samples.…”

Change in the mechanical properties of para-aramid fibres in thermal aging

“…However, these fibres are selected and their use is optimized based on a comparison of their functional properties, which are basically given in the literature for the indexes of the mechanical properties at ordinary temperatures [1][2][3][4][5][6][7]. The data on the thermal characteristics for the individual types of para-aramid fibres are unfortunately contradictory [1][2][3][4][5][8][9][10]. With the method used, the thermal stability of thermostable fibres is assessed by comparing the strength after exposure to a temperature of 250 or 300°C for 50-100 h. Unfortunately, the data from these studies were difficult to compare due to methodological differences in determinacy of selection, and frequently not knowing the characteristics of the samples.…”

“…Systematic studies of the performance effects on different kinds of aromatic fibres have been conducted for many years in the Department of Materials Science at St. Petersburg State University of Technology and Design, particularly concerning the effect of high temperatures and thermal aging which alter their properties [10][11][12][13][14]: a comparative evaluation of the thermal stability using thermomechanical analysis (TMA), dynamic thermogravimetry (TGA), differential scanning calorimetry (DSC), and differential thermal analysis (DTA); the basic data for para-aramid fibres obtained with these methods were published previously [11][12][13]; a comparative study of the effect of high temperatures and thermal aging on their mechanical properties. The logical evolution of this research was to study the kinetics of the change in the mechanical properties of paraaramid fibres in prolonged exposure to high temperatures and to analytically describe the kinetic data to predict the changes in Table 1.…”