超声处理对对位芳纶纤维分散性能及成纸性能的影响

Effect of ultrasonic treatment on the dispersion capability and sheet forming performance of para-aramid fiber

研究了超声波处理对对位芳纶短切纤维和浆粕纤维分散性能及成纸性能的影响,利用光学显微镜(OM)、红外光谱(FT-IR)、X-射线衍射(XRD)和动态接触角分析(DCAA)从表观形貌、化学结构、聚集态结构和表面润湿性能等方面探究了超声处理对对位芳纶纤维的分散机理.结果表明,超声处理时间分别为9min和12min时,对位芳纶短切纤维和浆粕纤维的分散性能最好,成纸的抗张指数和撕裂指数分别提高了22.6%和15.6%.超声处理对比表面积、表面活性基团及表面润湿性能的提高是改善对位芳纶短切纤维和浆粕纤维分散性能、提高对位芳纶纸机械强度的主要原因.

In this paper,the effect of ultrasonic treatment on the dispersion capability and sheet forming performance of para-aramid chopped fiber and pulp were studied.To explore the dispersion mechanisms of para-aramid chopped fiber and pulp,the surface morphology,surface chemical structure,super molecular structure,and surface wettability of para-aramid chopped fiber and pulp were investigated by optical microscope（OM）,fourier transform infrared spectroscopy（FT-IR）,X-ray diffraction（XRD）,and dynamic contact angle（DCA）,respectively.The results showed that para-aramid chopped fiber and pulp presented the best dispersion capability when treated by ultrasound for 9 min and 12 min,respectively.Meanwhile,in this condition,the tensile index and tear index of para-aramid paper were improved by 22.6% and 15.6%,respectively.The improvement of dispersion capability of para-aramid chopped fiber and pulp and the increase in mechanical properties of para-aramid paper primarily thanks to the enhancement in specific surface area,surface active groups,and surface wettability by ultrasonic treatment.