热处理工艺对PBO纤维拉伸性能影响

针对研究较少的聚对苯撑苯并双恶唑(PBO)纤维热处理工艺进行研究,通过控制热处理气氛、热处理温度、热处理停留时间和预加应力4个参数,对初纺丝PBO(PBO–AS)纤维的热处理工艺进行优化,得到拉伸性能大幅提高的PBO–HM纤维。利用电子织物强力仪对PBO–HM纤维的拉伸性能进行测试,发现热处理氛围为N2时PBO–HM纤维的性能更为优异;热处理温度控制在550℃以下时,热处理温度越高,热处理后得到的PBO–HM纤维的拉伸弹性模量越高,但热处理停留时间延长会使拉伸强度降低;预加应力有助于PBO–HM纤维拉伸弹性模量的增加。经分析得出,最优热处理温度为550℃,热处理停留时间为53.3 s,预加应力为5.48 c N/dtex,得到的PBO–HM的拉伸性能较优。

Effect of Heat-Treatment Procedure on Tensile Properties of PBO Fiber by Means

The heat treatment process of poly-p-phenylene benzobisthiazole (PBO) fibers was studied and optimized by controlling the parameters,such as heat treatment atmosphere,heat treatment temperature,heat treatment residence time and pre-stress. The tensile properties of PBO–AS fiber were greatly improved of PBO–HM fibers. The tensile strength of PBO–HM fibers were tested by electronic fabric strength meter. It can be found that PBO–HM fiber can have better properties when heat treatment atmosphere is N2. When the heat treatment temperature could be controlled below 550℃,the higher the heat treatment temperature is,the higher the modulus of PBO–HM fiber will present. But the elongation of heat treatment residence time decrease tensile strength of the PBO–HM fiber. Pre-stressing stress contributes to the increase of PBO–HM fiber tensile modulus of elasticity. The results show that the optimum heat treatment temperature can be 550℃,the heat treatment residence time is 53.3 s,the pre-stressing stress is 5.48 cN /dtex,the tensile property of PBO–HM will be more accepted.