Comparative study on the performance of PA66/PET composite cord
Using dynamic thermomechanical analysis(DMA)at a frequency of 10 Hz in tensile mode,the dy-namic mechanical properties of polyadiohexylenediamine(PA66)/polyethylene terephthalate(PET)compos-ite cord were investigated.In particular,the impact of temperature and thermal transition temperature on the material's fracture strength was examined and compared with PA66 cord.The glass transition temperature(Tg)of the PA66/PET composite cord increased by 5～10℃within the studied temperature range when compared to PA66 cord.This suggests that the PA66/PET composite cord's usage temperature increased by 5～10℃.The breaking strength of PA66 cord decreases more with rising temperatures than the breaking strength of PA66/PET composite cord,and the decrease is more noticeable at higher temperatures.The constant load elongation,dry heat shrinkage rate,and 1%～10%constant elongation stress of PA66/PET composite cord are all less than those of PA66 cord.Tires composed of PA66/PET composite cord have comparable overall performance to PA66 material in terms of cross-section,outer edge,bead detachment,strength,high speed,durability,etc.
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