Fabrication of PVDF Hybrid Blending Membrane via Microemulsion Polymerization Coupling with Blending Method †

doi:10.7503/cjcu20190189

Abstract

Abstract:

AgCl nanoparticles were obtained in the reverse microemulsion using styrene and methyl methacrylate mixture as an oil phase. And then, polymer emulsion containing AgCl nanoparticles was obtained through in-situ polymerization of oil monomers in the microemulsion. Finally, polyvinylidene fluoride(PVDF) blending hybrid membranes containing AgCl nanoparticles were constructed by blending method. The results from the structural characterization and ultrafiltration experiments, such as UV-visible spectroscopy, transmission electron microscopy(TEM), and scanning electron microscopy(SEM), showed that the addition of some polymer emulsion combined with hydrophilic polymer and AgCl nanoparticles with hydrophilic surface did not only improve the porosity and average pore size of the PVDF blending hybrid membranes, but also enhanced the polarity and hydrophilicity of the hybrid membranes, thus increasing the water flux and antifouling performance of the membranes. However, the addition of excess polymer emulsion could not blend uniformly with PVDF. Moreover, AgCl nanoparticles would form agglomerates in the membrane to clog the membrane pores. Thereby, the water flux and antifouling performance of the membranes were both weakened.

Key words: Microemulsion polymerization, Blending, Polyvinylidene fluoride membrane, AgCl nanoparticles, Ultrafiltration

CLC Number:

O631

TrendMD:

LIU Zihao,XIAO Han,YAO Yuan,WANG Ting,WU Liguang,ZHANG Xueyang. Fabrication of PVDF Hybrid Blending Membrane via Microemulsion Polymerization Coupling with Blending Method ^†[J]. Chem. J. Chinese Universities, 2019, 40(10): 2248.

Figures/Tables 13

Membrane	Addition amount of polymer emulsion containing AgCl nanoparticles/g	Mass fraction of polymer emulsion in PVDF blend membranes(%)	Membrane	Addition amount of polymer emulsion containing AgCl nanoparticles/g	Mass fraction of polymer emulsion in PVDF blend membranes(%)
PVDF	0	0	PVDF-15	0.9	15
PVDF-5	0.3	5	PVDF-30	1.8	30
PVDF-10	0.6	10	PVDF-50	3.0	50

Scheme 1 Preparation of AgCl/P(MMA-St)/PVDF blend membrane

Fig.1 UV-Vis spectra of AgCl-containing reverse microemulsion with different time

Fig.2 TEM image of AgCl nanoparticles generated in the reverse microemulsion

Fig.3 Effect of AgCl nanoparticles on the viscosity of polymer emulsion

Fig.4 TEM image of AgCl nanoparticles in polymer emulsion

Fig.5 FTIR spectra of PVDF and different PVDF composite ultrafiltration membranes

Fig.6 SEM images of surface of different membranes (A)PVDF; (B) PVDF-5; (C)PVDF-10; (D) PVDF-15; (E) PVDF-30; (F) PVDF-50.

Fig.7 SEM images of cross-section of different membranes (A) PVDF; (B) PVDF-5; (C) PVDF-10; (D) PVDF-15; (E) PVDF-30; (F) PVDF-50.

Membrane	ε(%)	r_m/nm	Zeta potential/mV	Membrane	ε(%)	r_m/nm	Zeta potential/mV
PVDF	30.2±0.1	35.1	-22	PVDF-15	73.6±0.2	69.7	-75
PVDF-5	59.9±0.2	61.2	-51	PVDF-30	59.1±0.3	55.7	-61
PVDF-10	69.8±0.3	59.2	-63	PVDF-50	55.3±0.3	56.5	-58

Fig.8 Water contact angle of PVDF and different PVDF composite ultrafiltration membranes (A) PVDF; (B) PVDF-5; (C) PVDF-10; (D) PVDF-15; (E) PVDF-30; (F) PVDF-50.

Fig.9 Pure water flux(Jw), BSA solution flux(Jp), recovery flux(Jr), and the flux recovery ratio(FRR) of different membranes a. PVDF; b.PVDF-5; c. PVDF-10; d. PVDF-15; e. PVDF-30; f. PVDF-50.

Fig.10 Anti-fouling ratio and the rejection ratio to BSA solution of different membranes a. PVDF; b.PVDF-5; c. PVDF-10; d. PVDF-15; e. PVDF-30; f. PVDF-50.

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