Effect of alkali treatment on morphological structure and mechanical properties of PTT fiber

This paper studied the effect of alkali treatment on morphological structure and mechanical properties of PTT,PET fiber through SEM,loss of weight,tensile curve and resilient-elasticity recovery.The experiment results show that hightemperature alkali treatment can make surface of PTT fiber dissolve to form a lot of micro-holes,and bring about much more loss of mechanical properties than room-temperature alkali treatment.Alkali resistance of PET fiber is superior to that of PTT fiber in room-temperature,but in high-temperature alkali resistance of PTT fiber is superior to that of PET fiber.Through alkali treatment in appropriate temperature and concentration,PTT fiber can maintain high mechanical properties.