Preparation and Performance of POMs/PS/PVA Electrospinning Fiber Membranes†

doi:10.7503/cjcu20130913

Abstract

Abstract:

POMs(phosphomolybdic acid)/PS(polystyrene)/PVA(polyvinyl alcohol) composite fibers were prepared by electrospinning, which were molded into a membrane. The structure and morphology of the composite fibers were characterized, by infrared(IR) spectroscopy, scanning electron microscopy(SEM) and energy dispersive X-ray(EDX) spectroscopy. The photocatalytic performance and mechanical properties of the composite fibers membranes were also tested. The results show that the Keggin structure of POMs in the composite fiber was not destroyed. When the mass ratio of PS and PVA was 1∶1, the composite fibers got the best morphology, smooth surface and smaller diameter along with uniform distribution. The diameter of composite fibers decreased with the increase of POMs content. UV test showed that the POMs immobilized on composite fiber membranes displayed higher photocatalytic activity than that of the direct use. Around 98% of methyl orange was degraded after 25 min irradiation. The composite fiber membrane was easy to recycle and reuse. After using 5 times repeatedly, the photocatalytic activity of the composite fiber membranes was not significantly reduced. The composite fiber membranes were very few breakages. The composite fiber membranes strength increased first and then decreased with the POMs content increased. The toughness increased with the increase of PVA content but the toughness decreased with the increasing of the POMs content.

Key words: Phosphomolybdic acid, Polystyrene, Polyvinyl alcohol, Electrospinning, Composite fiber membrane

CLC Number:

O631

TrendMD:

LI Tingting, LIU Ce, ZHANG Zhiming, AN Libao, YANG Cuihuan. Preparation and Performance of POMs/PS/PVA Electrospinning Fiber Membranes^†[J]. Chem. J. Chinese Universities, 2014, 35(2): 389.

Figures/Tables 11

Fig.1 Infrared spectra of POMs(A) and POMs/PS/PVA composite fibers(B)

Fig.2 EDX spectrum of POMs/PS/PVA composite fibers membrane

Fig.3 SEM images of composite fibers with the different mass ratios of PS and PVA Mass ratio of PS and PVA : (A) 1∶2; (B) 1∶1; (C) 3∶2; (D) 2∶1.

Fig.4 SEM images of the composite fibers with different contents of POMs in the spinning solutionContent of POMs/(mg·mL-1): (A) 5; (B) 10; (C) 15; (D) 20.

Fig.5 UV-Vis spectra of reaction of methyl orange catalysed by the POMs/PS/PVA composite fiber membranes at different timeTime of reaction/min: a. 5; b. 10; c. 15; d. 20; e. 25.

Fig.6 Concentration change of methyl orange vs. irradiation time for POMs(a) and POMs/PS/PVA composite fiber membranes(b)

Fig.7 Recycle use of the composite fiber membranes for different cycle times at an interval of 25 minCycle times: a. 1; b. 2; c. 3; d. 4; e. 5.

Table 1 Mass loss of POMs measured at an interval of 25 min(total 5 intervals) after the composite fiber membrane immersed in water*

No.	pH	Mass of POMs in the water/mg	Mass loss of POMs(%)
1	7.18	0	0
2	7.19	0	0
3	7.18	0	0
4	5.35	0.27	0.14
5	5.09	0.49	0.25

Table 2 Tensile strength and elongation of the composite fiber membrane with different mass ratio of PS and PVA

Mass ratio of PS/PVA	Cold pressing(room temperature)		Hot pressing(50 ℃)
Mass ratio of PS/PVA	Tensile strength / MPa	Tensile fracture strain(%)	Tensile strength/MPa	Tensile fracture strain(%)
1∶2	0.43	58.15	8.16	220.77
1∶1	0.44	45.14	9.56	123.56
3∶2	0.47	30.63	10.34	113.46
2∶1	0.68	15.22	11.68	68.85

Table 3 Tensile strength and elongation of composite fiber membranes with different contents of POMs

Mass fraction of POMs(%)	Cold pressing(room temperature)		Hot pressing(50 ℃)
Mass fraction of POMs(%)	Tensile strength/MPa	Tensile fracture strain(%)	Tensile strength/MPa	Tensile fracture strain(%)
4.76	0.42	72.80	9.99	188.88
9.09	0.68	68.15	15.22	183.73
13.04	0.60	65.65	13.43	165.66
16.67	0.44	40.48	10.74	134.03

Fig.8 SEM images of the composite fibers membrane after cold pressing(A) and hot pressing(B)

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