超声时间对聚偏氟乙烯/SiO2平板膜性能和结构的影响

摘要/Abstract

摘要：

为得到性能稳定的平板膜，将纳米粒子SiO2 填充到聚偏氟乙烯（PVDF）中，添加非离子型表面活性剂吐温80，对含有纳米SiO2的乳液进行超声波分散，利用超声空化作用使得纳米粒子分散均匀，通过相转化法制备出PVDF超滤膜。通过差示扫描量热法、X射线衍射分析不同超声时间对膜结晶度的影响，采用全反射傅里叶红外光谱考察膜的官能团结构有无变化，并对膜的表面和截面形貌进行扫描电镜观察。结果表明：不同超声时间并没有改变膜的结晶度，但是微观结构不同。测试了膜的亲水性、力学性能和渗透性能，结果表明，亲水性、力学性能、纯水通量均随着超声时间的延长，先达到最佳值随后开始减弱，超声时间对牛血清白蛋白的截留率没有明显的影响。

关键词: 聚偏氟乙烯／SiO2平板膜, 表面活性剂, 超声空化, 纳米粒子, 晶体结构, 亲水性

Abstract:

SiO2 nanoparticles and non-ionic surfactant tween 80 were filled into PVDF so that PVDF ultrafiltration membranes were prepared through the phase inversion method, SiO2 emulsion was dispersed by ultrasonic and nanoparticles were uniformly dispersed through ultrasonic cavitation. The effect of different ultrasonic time on the degree of crystallinity was measured by differential scanning calorimetry (DSC) and X-ray diffraction (XRD), using total reflection Fourier transform infrared spectroscopy (ATR-FTIR) studied the crystal structure of the membranes. Surface and cross-section morphology of the membranes were observed through scanning electron microscope (SEM). The results showed that different ultrasonic time did not change the crystalline state of the membranes and the microstructure was different with the ultrasonic time. At last, hydrophilic, mechanical strength and permeability of membranes were also characterized. The experimental datas showed that the hydrophilic and mechanical properties with the increasing of ultrasonic time appeared the best values, but after that, the properties were becoming weaken. The result of pure water flux was the same as above, but the ultrasonic time had no significant effect on the retention of bovine serum albumin.

吴清涛王北福姜洪涛聂立宏. 超声时间对聚偏氟乙烯/SiO2平板膜性能和结构的影响[J]. 纺织学报, 2016, 37(07): 28-33.

参考文献

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