Abstract:

In order to study the thermal properties of polyimide fibers as textile fibers, polyimide fibers and polyimide knitted fabric were used as the research object. TG and DTA were used to analyze the thermodynamic property of polyimide fibers, and the heat resistance of the fibers were tested; at the same time, the influence of the fabric structure on the flame retardant, warmth retention properties and air permeability of polyimide fabrics was discussed. The results show that polyimide fiber have good heat resistance, began to thermally decomposition at about 570℃ and has lower strength lower strength loss at 200℃, and the strength of the fiber can still maintain at 80% of that of original fiber after treatment for 1.5 h. Polyimide fiber fabric have better flame retardantcy and the limit oxygen index greater than 45%, and the flame retardancy is enhancement with the increase of the surface density of the fabric; and the warmth retention property of the polyimide fabric are greatly influenced by fabric structure, for structure loose fabrics, the warmth retention decreased with increase of gas permeability, it is also influenced by the fabric thickness, and under certain conditions, the fabric thickness plays a leading role in the warm retention properties.

Key words: polyimide fiber fabric, thermal property, warmth retention, combustion behavior