JOURNAL OF TEXTILE RESEARCH ›› 2016, Vol. 37 ›› Issue (07): 28-33.

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Effect of ultrasonic time on property and structure of polyvinylidene fluoride/SiO2 flat membrane

  

  • Received:2015-06-10 Revised:2016-03-01 Online:2016-07-15 Published:2016-07-15

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.

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