Preparation and oil⁃water separation performance of PDMS/PVDF electrospun membranes

doi:10.19491/j.issn.1001-9278.2024.01.005

Abstract

Abstract:

The PDMS/PVDF membranes with a special wetting surface were prepared for oil⁃water separation by using an electrospinning technology. The effect of mass ratio of PVDF to PDMS on the membrane⁃forming performance was investigated. The results indicated that an appropriate amount of PVDF could generate a spinning and plasticizing effect on PDMS， and the presence of microspheres resulted in better hydrophobicity for the membranes compared to those without microspheres. Furthermore， the membranes exhibited a high adhesion to water due to a capillary force and electrostatic interactions. When the mass ratio of PVDF to PDMS was 2∶1， the membranes showed the optimal hydrophobicity with a water contact angle up to 150 ° and an oil contact angle closed to 0 °. The separation rate of the membranes for water⁃in⁃oil emulsions was more than 98 %. This makes the membranes developed in this work a good candidate as an oil⁃water separation material.

Key words: electrospinning, polydimethylsiloxane, polyvinylidene difluoride, oil?water separation

CLC Number:

TQ320.72⁺1

LI Jie, LU Yiyi, SHI Wentian, GUO Yunjie, WANG Yuke. Preparation and oil⁃water separation performance of PDMS/PVDF electrospun membranes[J]. China Plastics, 2024, 38(1): 28-34.

Figures/Tables 8

Fig.1. Preparation process of PVDF/PDMS electrospinning membranes

Fig.2. SEM of different PVDF/PDMS electrospun membranes

Fig.3. EDS analysis of membrane P3

Fig.4. FTIR of different membranes and the principle of PVDF phase transition

Fig.5. The wettability of the membrane surface

样品	最大拉力/N	断裂伸长率/%	断裂强度/MPa
P0	0.91	36.93	0.97
P1	1.75	81.18	0.54
P2	5.07	86.15	1.15
P3	2.64	68.30	1.84
P4	2.56	66.10	1.82
P5	0.48	103.85	0.38

Tab.1. Mechanical properties of PDMS/PVDF membranes

Fig.6. Oil⁃water separation capacity of the membranes

Fig.7. Separation efficiency of different membranes in ten separation cycles

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