Abstract: The brittle of Polyphenylene sulfide (PPS) is strong, and it affects the spinnability of fibers. The slow cold device is added to change the state of aggregation structure, then to improve the toughness of PPS fiber. Effect of slow cold temperature on the structure and properties of PPS fiber is studied,the results show that slow cold temperatures have a greater impact on the degree of crystallinity of the PPS fiber, among them, with the slow cold temperature increased, PPS UDY crystallinity decreased, the reduced rate was 29.8%; but the crystallinity of PPS DT also increased , the rate of increase was 12.0%; with the slow cold temperature increased, the orientation degree of UDY decreased gradually, the reduced rate was 7.8%, orientation degree of DT yarn increased gradually, the increase was 15.3%,when the temperature was 175℃,it decreased; with the slow cold temperature increased, The breaking strength of PPS DT wire increased gradually, the maximum increase was 9.9%,it began to decrease at 175 ℃, the breaking elongation had the opposite trend, the largest decline was 31.2%; with the slow cold temperature increased, the drying shrinkage of the PPS fiber reduced gradually, the largest drop was 46.6%, when the temperature was over 175℃, the drying shrinkage began to increase, the initial modulus increased gradually with increasing slow cold temperature, the maximum increase was 12.7%.

Key words: PPS fiber, slow cooling temperature, structure, performance